// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analysis_server/lsp_protocol/protocol_generated.dart';
import 'package:analysis_server/src/lsp/constants.dart';
import 'package:analyzer_plugin/protocol/protocol_common.dart' as plugin;
import 'package:analyzer_plugin/protocol/protocol_generated.dart' as plugin;
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../tool/lsp_spec/matchers.dart';
import 'completion.dart';
import 'server_abstract.dart';

void main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(CompletionTest);
    defineReflectiveTests(CompletionTestWithNullSafetyTest);
  });
}

@reflectiveTest
class CompletionTest extends AbstractLspAnalysisServerTest
    with CompletionTestMixin {
  void expectAutoImportCompletion(List<CompletionItem> items, String file) {
    expect(
      items.singleWhere(
        (c) => c.detail?.contains("Auto import from '$file'") ?? false,
        orElse: () => null,
      ),
      isNotNull,
    );
  }

  @override
  void setUp() {
    super.setUp();
    writePackageConfig(
      projectFolderPath,
      flutter: true,
    );
  }

  Future<void> test_commitCharacter_completionItem() async {
    await provideConfig(
      () => initialize(
        textDocumentCapabilities:
            withAllSupportedTextDocumentDynamicRegistrations(
                emptyTextDocumentClientCapabilities),
        workspaceCapabilities:
            withConfigurationSupport(emptyWorkspaceClientCapabilities),
      ),
      {'previewCommitCharacters': true},
    );

    final content = '''
main() {
  pri^
}
    ''';

    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final print = res.singleWhere((c) => c.label == 'print(…)');
    expect(print.commitCharacters, equals(dartCompletionCommitCharacters));
  }

  Future<void> test_commitCharacter_config() async {
    final registrations = <Registration>[];
    // Provide empty config and collect dynamic registrations during
    // initialization.
    await provideConfig(
      () => monitorDynamicRegistrations(
        registrations,
        () => initialize(
            textDocumentCapabilities:
                withAllSupportedTextDocumentDynamicRegistrations(
                    emptyTextDocumentClientCapabilities),
            workspaceCapabilities:
                withDidChangeConfigurationDynamicRegistration(
                    withConfigurationSupport(
                        emptyWorkspaceClientCapabilities))),
      ),
      {},
    );

    Registration registration(Method method) =>
        registrationFor(registrations, method);

    // By default, there should be no commit characters.
    var reg = registration(Method.textDocument_completion);
    var options = CompletionRegistrationOptions.fromJson(reg.registerOptions);
    expect(options.allCommitCharacters, isNull);

    // When we change config, we should get a re-registration (unregister then
    // register) for completion which now includes the commit characters.
    await monitorDynamicReregistration(
        registrations, () => updateConfig({'previewCommitCharacters': true}));
    reg = registration(Method.textDocument_completion);
    options = CompletionRegistrationOptions.fromJson(reg.registerOptions);
    expect(options.allCommitCharacters, equals(dartCompletionCommitCharacters));
  }

  Future<void> test_completeFunctionCalls() async {
    final content = '''
    void myFunction(String a, int b, {String c}) {}

    main() {
      [[myFu^]]
    }
    ''';

    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities:
            withConfigurationSupport(emptyWorkspaceClientCapabilities),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'myFunction(…)');
    // Ensure the snippet comes through in the expected format with the expected
    // placeholders.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals(r'myFunction(${1:a}, ${2:b})'));
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals(item.insertText));
    expect(textEdit.range, equals(rangeFromMarkers(content)));
  }

  Future<void> test_completeFunctionCalls_flutterSetState() async {
    // Flutter's setState method has special handling inside SuggestionBuilder
    // that already adds in a selection (which overlaps with completeFunctionCalls).
    // Ensure we don't end up with two sets of parens/placeholders in this case.
    final content = '''
import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  @override
  Widget build(BuildContext context) {
    [[setSt^]]
    return Container();
  }
}
    ''';

    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities:
            withConfigurationSupport(emptyWorkspaceClientCapabilities),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label.startsWith('setState('));

    // Usually the label would be "setState(…)" but here it's slightly different
    // to indicate a full statement is being inserted.
    expect(item.label, equals('setState(() {});'));

    // Ensure the snippet comes through in the expected format with the expected
    // placeholders.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals('setState(() {\n      \${0:}\n    \\});'));
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals(item.insertText));
    expect(textEdit.range, equals(rangeFromMarkers(content)));
  }

  Future<void> test_completeFunctionCalls_noRequiredParameters() async {
    final content = '''
    void myFunction({int a}) {}

    main() {
      [[myFu^]]
    }
    ''';

    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities:
            withConfigurationSupport(emptyWorkspaceClientCapabilities),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'myFunction(…)');
    // With no required params, there should still be parens and a tabstop inside.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals(r'myFunction(${0:})'));
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals(item.insertText));
    expect(textEdit.range, equals(rangeFromMarkers(content)));
  }

  Future<void> test_completeFunctionCalls_show() async {
    final content = '''
    import 'dart:math' show mi^
    ''';

    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities:
            withConfigurationSupport(emptyWorkspaceClientCapabilities),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'min(…)');
    // The insert text should be a simple string with no parens/args and
    // no need for snippets.
    expect(item.insertTextFormat, isNull);
    expect(item.insertText, equals(r'min'));
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals(item.insertText));
  }

  Future<void> test_completeFunctionCalls_suggestionSets() async {
    final content = '''
    main() {
      [[pri]]^
    }
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities: withConfigurationSupport(
            withApplyEditSupport(emptyWorkspaceClientCapabilities)),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'print(…)');
    // Ensure the snippet comes through in the expected format with the expected
    // placeholders.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals(r'print(${0:object})'));
    expect(item.textEdit, isNull);

    // Ensure the item can be resolved and gets a proper TextEdit.
    final resolved = await resolveCompletion(item);
    expect(resolved.textEdit, isNotNull);
    final textEdit = toTextEdit(resolved.textEdit);
    expect(textEdit.newText, equals(item.insertText));
    expect(textEdit.range, equals(rangeFromMarkers(content)));
  }

  Future<void> test_completionKinds_default() async {
    newFile(join(projectFolderPath, 'file.dart'));
    newFolder(join(projectFolderPath, 'folder'));

    final content = "import '^';";

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final file = res.singleWhere((c) => c.label == 'file.dart');
    final folder = res.singleWhere((c) => c.label == 'folder/');
    final builtin = res.singleWhere((c) => c.label == 'dart:core');
    // Default capabilities include File + Module but not Folder.
    expect(file.kind, equals(CompletionItemKind.File));
    // We fall back to Module if Folder isn't supported.
    expect(folder.kind, equals(CompletionItemKind.Module));
    expect(builtin.kind, equals(CompletionItemKind.Module));
  }

  Future<void> test_completionKinds_imports() async {
    final content = "import '^';";

    // Tell the server we support some specific CompletionItemKinds.
    await initialize(
      textDocumentCapabilities: withCompletionItemKinds(
        emptyTextDocumentClientCapabilities,
        [
          CompletionItemKind.File,
          CompletionItemKind.Folder,
          CompletionItemKind.Module,
        ],
      ),
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final file = res.singleWhere((c) => c.label == 'file.dart');
    final folder = res.singleWhere((c) => c.label == 'folder/');
    final builtin = res.singleWhere((c) => c.label == 'dart:core');
    expect(file.kind, equals(CompletionItemKind.File));
    expect(folder.kind, equals(CompletionItemKind.Folder));
    expect(builtin.kind, equals(CompletionItemKind.Module));
  }

  Future<void> test_completionKinds_supportedSubset() async {
    final content = '''
    class MyClass {
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^
    }
    ''';

    // Tell the server we only support the Field CompletionItemKind.
    await initialize(
      textDocumentCapabilities: withCompletionItemKinds(
          emptyTextDocumentClientCapabilities, [CompletionItemKind.Field]),
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final kinds = res.map((item) => item.kind).toList();

    // Ensure we only get nulls or Fields (the sample code contains Classes).
    expect(
      kinds,
      everyElement(anyOf(isNull, equals(CompletionItemKind.Field))),
    );
  }

  Future<void> test_completionTriggerKinds_invalidParams() async {
    await initialize();

    final invalidTriggerKind = CompletionTriggerKind.fromJson(-1);
    final request = getCompletion(
      mainFileUri,
      Position(line: 0, character: 0),
      context: CompletionContext(
          triggerKind: invalidTriggerKind, triggerCharacter: 'A'),
    );

    await expectLater(
        request, throwsA(isResponseError(ErrorCodes.InvalidParams)));
  }

  Future<void> test_filterTextNotIncludeAdditionalText() async {
    // Some completions (eg. overrides) have additional text that is not part
    // of the label. That text should _not_ appear in filterText as it will
    // affect the editors relevance ranking as the user types.
    // https://github.com/dart-lang/sdk/issues/45157
    final content = '''
    abstract class Person {
      String get name;
    }

    class Student extends Person {
      nam^
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label.startsWith('name =>'),
        orElse: () => null);
    expect(item, isNotNull);
    expect(item.label, equals('name => …'));
    expect(item.filterText, isNull); // Falls back to label
    expect(item.insertText, equals('''@override
  // TODO: implement name
  String get name => throw UnimplementedError();'''));
  }

  Future<void> test_fromPlugin_dartFile() async {
    final content = '''
    void main() {
      var x = '';
      print(^);
    }
    ''';

    final pluginResult = plugin.CompletionGetSuggestionsResult(
      content.indexOf('^'),
      0,
      [
        plugin.CompletionSuggestion(
          plugin.CompletionSuggestionKind.INVOCATION,
          100,
          'x.toUpperCase()',
          -1,
          -1,
          false,
          false,
        ),
      ],
    );
    configureTestPlugin(respondWith: pluginResult);

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));

    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final fromServer = res.singleWhere((c) => c.label == 'x');
    final fromPlugin = res.singleWhere((c) => c.label == 'x.toUpperCase()');

    expect(fromServer.kind, equals(CompletionItemKind.Variable));
    expect(fromPlugin.kind, equals(CompletionItemKind.Method));
  }

  Future<void> test_fromPlugin_nonDartFile() async {
    final pluginAnalyzedFilePath = join(projectFolderPath, 'lib', 'foo.foo');
    final pluginAnalyzedFileUri = Uri.file(pluginAnalyzedFilePath);
    final content = '''
    CREATE TABLE foo (
      id INTEGER NOT NULL PRIMARY KEY
    );

    query: SELECT ^ FROM foo;
    ''';

    final pluginResult = plugin.CompletionGetSuggestionsResult(
      content.indexOf('^'),
      0,
      [
        plugin.CompletionSuggestion(
          plugin.CompletionSuggestionKind.IDENTIFIER,
          100,
          'id',
          -1,
          -1,
          false,
          false,
        ),
      ],
    );
    configureTestPlugin(respondWith: pluginResult);

    await initialize();
    await openFile(pluginAnalyzedFileUri, withoutMarkers(content));
    final res =
        await getCompletion(pluginAnalyzedFileUri, positionFromMarker(content));

    expect(res, hasLength(1));
    final suggestion = res.single;

    expect(suggestion.kind, CompletionItemKind.Variable);
    expect(suggestion.label, equals('id'));
  }

  Future<void> test_fromPlugin_tooSlow() async {
    final content = '''
    void main() {
      var x = '';
      print(^);
    }
    ''';

    final pluginResult = plugin.CompletionGetSuggestionsResult(
      content.indexOf('^'),
      0,
      [
        plugin.CompletionSuggestion(
          plugin.CompletionSuggestionKind.INVOCATION,
          100,
          'x.toUpperCase()',
          -1,
          -1,
          false,
          false,
        ),
      ],
    );
    configureTestPlugin(
      respondWith: pluginResult,
      // Don't respond within an acceptable time
      respondAfter: Duration(seconds: 1),
    );

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));

    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final fromServer = res.singleWhere((c) => c.label == 'x');
    final fromPlugin = res.singleWhere((c) => c.label == 'x.toUpperCase()',
        orElse: () => null);

    // Server results should still be included.
    expect(fromServer.kind, equals(CompletionItemKind.Variable));
    // Plugin results are not because they didn't arrive in time.
    expect(fromPlugin, isNull);
  }

  Future<void> test_gettersAndSetters() async {
    final content = '''
    class MyClass {
      String get justGetter => '';
      String set justSetter(String value) {}
      String get getterAndSetter => '';
      String set getterAndSetter(String value) {}
    }

    main() {
      MyClass a;
      a.^
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final getter = res.singleWhere((c) => c.label == 'justGetter');
    final setter = res.singleWhere((c) => c.label == 'justSetter');
    final both = res.singleWhere((c) => c.label == 'getterAndSetter');
    expect(getter.detail, equals('String'));
    expect(setter.detail, equals('String'));
    expect(both.detail, equals('String'));
    [getter, setter, both].forEach((item) {
      expect(item.kind, equals(CompletionItemKind.Property));
    });
  }

  Future<void> test_insertReplaceRanges() async {
    final content = '''
    class MyClass {
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^def
    }
    ''';

    await initialize(
      textDocumentCapabilities: withCompletionItemInsertReplaceSupport(
          emptyTextDocumentClientCapabilities),
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'abcdefghij'), isTrue);
    final item = res.singleWhere((c) => c.label == 'abcdefghij');
    // When using the replacement range, we should get exactly the symbol
    // we expect.
    final replaced = applyTextEdits(
      withoutMarkers(content),
      [textEditForReplace(item.textEdit)],
    );
    expect(replaced, contains('a.abcdefghij\n'));
    // When using the insert range, we should retain what was after the caret
    // ("def" in this case).
    final inserted = applyTextEdits(
      withoutMarkers(content),
      [textEditForInsert(item.textEdit)],
    );
    expect(inserted, contains('a.abcdefghijdef\n'));
  }

  Future<void> test_insertTextMode_multiline() async {
    final content = '''
    import 'package:flutter/material.dart';

    class _MyWidgetState extends State<MyWidget> {
      @override
      Widget build(BuildContext context) {
        [[setSt^]]
        return Container();
      }
    }
    ''';

    await initialize(
        textDocumentCapabilities: withCompletionItemInsertTextModeSupport(
            emptyTextDocumentClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label.startsWith('setState'));

    // Multiline completions should always set insertTextMode.asIs.
    expect(item.insertText, contains('\n'));
    expect(item.insertTextMode, equals(InsertTextMode.asIs));
  }

  Future<void> test_insertTextMode_singleLine() async {
    final content = '''
    main() {
      ^
    }
    ''';

    await initialize(
        textDocumentCapabilities: withCompletionItemInsertTextModeSupport(
            emptyTextDocumentClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label.startsWith('main'));

    // Single line completions should never set insertTextMode.asIs to
    // avoid bloating payload size where it wouldn't matter.
    expect(item.insertText, isNot(contains('\n')));
    expect(item.insertTextMode, isNull);
  }

  Future<void> test_insideString() async {
    final content = '''
    var a = "This is ^a test"
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res, isEmpty);
  }

  Future<void> test_isDeprecated_notSupported() async {
    final content = '''
    class MyClass {
      @deprecated
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'abcdefghij');
    expect(item.deprecated, isNull);
    // If the does not say it supports the deprecated flag, we should show
    // '(deprecated)' in the details.
    expect(item.detail.toLowerCase(), contains('deprecated'));
  }

  Future<void> test_isDeprecated_supportedFlag() async {
    final content = '''
    class MyClass {
      @deprecated
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^
    }
    ''';

    await initialize(
        textDocumentCapabilities: withCompletionItemDeprecatedFlagSupport(
            emptyTextDocumentClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'abcdefghij');
    expect(item.deprecated, isTrue);
    // If the client says it supports the deprecated flag, we should not show
    // deprecated in the details.
    expect(item.detail, isNot(contains('deprecated')));
  }

  Future<void> test_isDeprecated_supportedTag() async {
    final content = '''
    class MyClass {
      @deprecated
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^
    }
    ''';

    await initialize(
        textDocumentCapabilities: withCompletionItemTagSupport(
            emptyTextDocumentClientCapabilities,
            [CompletionItemTag.Deprecated]));
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'abcdefghij');
    expect(item.tags, contains(CompletionItemTag.Deprecated));
    // If the client says it supports the deprecated tag, we should not show
    // deprecated in the details.
    expect(item.detail, isNot(contains('deprecated')));
  }

  Future<void> test_namedArg_insertReplaceRanges() async {
    /// Helper to check multiple completions in the same template file.
    Future<void> check(
      String code,
      String expectedLabel, {
      String expectedReplace,
      String expectedInsert,
    }) async {
      final content = '''
class A { const A({int argOne, int argTwo, String argThree}); }
final varOne = '';
$code
main() { }
''';
      final expectedReplaced = '''
class A { const A({int argOne, int argTwo, String argThree}); }
final varOne = '';
$expectedReplace
main() { }
''';
      final expectedInserted = '''
class A { const A({int argOne, int argTwo, String argThree}); }
final varOne = '';
$expectedInsert
main() { }
''';

      await verifyCompletions(
        mainFileUri,
        content,
        expectCompletions: [expectedLabel],
        applyEditsFor: expectedLabel,
        verifyInsertReplaceRanges: true,
        expectedContent: expectedReplaced,
        expectedContentIfInserting: expectedInserted,
      );
    }

    // When at the start of the identifier, it will be set as the replacement
    // range so we don't expect the ': ,'
    await check(
      '@A(^argOne: 1)',
      'argTwo',
      expectedReplace: '@A(argTwo: 1)',
      expectedInsert: '@A(argTwoargOne: 1)',
    );

    // When adding a name to an existing value, it should always insert.
    await check(
      '@A(^1)',
      'argOne: ',
      expectedReplace: '@A(argOne: 1)',
      expectedInsert: '@A(argOne: 1)',
    );

    // When adding a name to an existing variable, it should always insert.
    await check(
      '@A(argOne: 1, ^varOne)',
      'argTwo: ',
      expectedReplace: '@A(argOne: 1, argTwo: varOne)',
      expectedInsert: '@A(argOne: 1, argTwo: varOne)',
    );

    // // Inside the identifier also should be expected to replace.
    await check(
      '@A(arg^One: 1)',
      'argTwo',
      expectedReplace: '@A(argTwo: 1)',
      expectedInsert: '@A(argTwoOne: 1)',
    );

    // If there's a space, there's no replacement range so we should still get
    // the colon/comma since this is always an insert (and both operations will
    // produce the same text).
    await check(
      '@A(^ argOne: 1)',
      'argTwo: ',
      expectedReplace: '@A(argTwo: ^, argOne: 1)',
      expectedInsert: '@A(argTwo: ^, argOne: 1)',
    );

    // Partially typed names in front of values (that aren't considered part of
    // the same identifier) should also suggest name labels.
    await check(
      '''@A(argOne: 1, argTh^'Foo')''',
      'argThree: ',
      expectedReplace: '''@A(argOne: 1, argThree: 'Foo')''',
      expectedInsert: '''@A(argOne: 1, argThree: 'Foo')''',
    );
  }

  Future<void> test_namedArg_offsetBeforeCompletionTarget() async {
    // This test checks for a previous bug where the completion target was a
    // symbol far after the cursor offset (`aaaa` here) and caused the whole
    // identifier to be used as the `targetPrefix` which would filter out
    // other symbol.
    // https://github.com/Dart-Code/Dart-Code/issues/2672#issuecomment-666085575
    final content = '''
    void main() {
      myFunction(
        ^
        aaaa: '',
      );
    }

    void myFunction({String aaaa, String aaab, String aaac}) {}
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'aaab: '), isTrue);
  }

  Future<void> test_namedArg_plainText() async {
    final content = '''
    class A { const A({int one}); }
    @A(^)
    main() { }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'one: '), isTrue);
    final item = res.singleWhere((c) => c.label == 'one: ');
    expect(item.insertTextFormat,
        anyOf(equals(InsertTextFormat.PlainText), isNull));
    expect(item.insertText, anyOf(equals('test'), isNull));
    final updated = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(item.textEdit)],
    );
    expect(updated, contains('one: '));
  }

  Future<void> test_namedArg_snippetStringSelection_endOfString() async {
    final content = '''
    class A { const A({int one}); }
    @A(^)
    main() { }
    ''';

    await initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'one: '), isTrue);
    final item = res.singleWhere((c) => c.label == 'one: ');
    // As the selection is the end of the string, there's no need for a snippet
    // here. Since the insert text is also the same as the label, it does not
    // need to be provided.
    expect(item.insertTextFormat, isNull);
    expect(item.insertText, isNull);
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals('one: '));
    expect(
      textEdit.range,
      equals(Range(
          start: positionFromMarker(content),
          end: positionFromMarker(content))),
    );
  }

  Future<void>
      test_namedArgTrailing_snippetStringSelection_insideString() async {
    final content = '''
    main({int one, int two}) {
      main(
        ^
        two: 2,
      );
    }
    ''';

    await initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'one: '), isTrue);
    final item = res.singleWhere((c) => c.label == 'one: ');
    // Ensure the snippet comes through in the expected format with the expected
    // placeholder.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals(r'one: ${0:},'));
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals(r'one: ${0:},'));
    expect(
      textEdit.range,
      equals(Range(
          start: positionFromMarker(content),
          end: positionFromMarker(content))),
    );
  }

  Future<void> test_nonDartFile() async {
    newFile(pubspecFilePath, content: simplePubspecContent);
    await initialize();

    final res = await getCompletion(pubspecFileUri, startOfDocPos);
    expect(res, isEmpty);
  }

  Future<void> test_parensNotInFilterTextInsertText() async {
    final content = '''
    class MyClass {}

    main() {
      MyClass a = new MyCla^
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'MyClass()'), isTrue);
    final item = res.singleWhere((c) => c.label == 'MyClass()');
    expect(item.filterText, equals('MyClass'));
    expect(item.insertText, equals('MyClass'));
  }

  Future<void> test_plainText() async {
    final content = '''
    class MyClass {
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'abcdefghij'), isTrue);
    final item = res.singleWhere((c) => c.label == 'abcdefghij');
    expect(item.insertTextFormat,
        anyOf(equals(InsertTextFormat.PlainText), isNull));
    expect(item.insertText, anyOf(equals('abcdefghij'), isNull));
    final updated = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(item.textEdit)],
    );
    expect(updated, contains('a.abcdefghij'));
  }

  Future<void> test_prefixFilter_endOfSymbol() async {
    final content = '''
    class UniqueNamedClassForLspOne {}
    class UniqueNamedClassForLspTwo {}
    class UniqueNamedClassForLspThree {}

    main() {
      // Should match only Two and Three
      UniqueNamedClassForLspT^
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspOne'), isFalse);
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspTwo'), isTrue);
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspThree'), isTrue);
  }

  Future<void> test_prefixFilter_midSymbol() async {
    final content = '''
    class UniqueNamedClassForLspOne {}
    class UniqueNamedClassForLspTwo {}
    class UniqueNamedClassForLspThree {}

    main() {
      // Should match only Two and Three
      UniqueNamedClassForLspT^hree
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspOne'), isFalse);
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspTwo'), isTrue);
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspThree'), isTrue);
  }

  Future<void> test_prefixFilter_startOfSymbol() async {
    final content = '''
    class UniqueNamedClassForLspOne {}
    class UniqueNamedClassForLspTwo {}
    class UniqueNamedClassForLspThree {}

    main() {
      // Should match all three
      ^UniqueNamedClassForLspT
    }
    ''';

    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspOne'), isTrue);
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspTwo'), isTrue);
    expect(res.any((c) => c.label == 'UniqueNamedClassForLspThree'), isTrue);
  }

  Future<void> test_suggestionSets() async {
    newFile(
      join(projectFolderPath, 'other_file.dart'),
      content: '''
      /// This class is in another file.
      class InOtherFile {}
      ''',
    );

    final content = '''
main() {
  InOtherF^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    // Find the completion for the class in the other file.
    final completion = res.singleWhere((c) => c.label == 'InOtherFile');
    expect(completion, isNotNull);

    // Expect no docs or text edit, since these are added during resolve.
    expect(completion.documentation, isNull);
    expect(completion.textEdit, isNull);

    // Resolve the completion item (via server) to get its edits. This is the
    // LSP's equiv of getSuggestionDetails() and is invoked by LSP clients to
    // populate additional info (in our case, the additional edits for inserting
    // the import).
    final resolved = await resolveCompletion(completion);
    expect(resolved, isNotNull);

    // Ensure the detail field was update to show this will auto-import.
    expect(
        resolved.detail, startsWith("Auto import from '../other_file.dart'"));

    // Ensure the doc comment was added.
    expect(
      resolved.documentation.valueEquals('This class is in another file.'),
      isTrue,
    );

    // Ensure the edit was added on.
    expect(resolved.textEdit, isNotNull);

    // There should be no command for this item because it doesn't need imports
    // in other files. Same-file completions are in additionalEdits.
    expect(resolved.command, isNull);

    // Apply both the main completion edit and the additionalTextEdits atomically.
    final newContent = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );

    // Ensure both edits were made - the completion, and the inserted import.
    expect(newContent, equals('''
import '../other_file.dart';

main() {
  InOtherFile
}
    '''));
  }

  Future<void> test_suggestionSets_doesNotFilterSymbolsWithSameName() async {
    // Classes here are not re-exports, so should not be filtered out.
    newFile(
      join(projectFolderPath, 'source_file1.dart'),
      content: 'class MyDuplicatedClass {}',
    );
    newFile(
      join(projectFolderPath, 'source_file2.dart'),
      content: 'class MyDuplicatedClass {}',
    );
    newFile(
      join(projectFolderPath, 'source_file3.dart'),
      content: 'class MyDuplicatedClass {}',
    );

    final content = '''
main() {
  MyDuplicated^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final completions =
        res.where((c) => c.label == 'MyDuplicatedClass').toList();
    expect(completions, hasLength(3));

    // Resolve the completions so we can get the auto-import text.
    final resolvedCompletions =
        await Future.wait(completions.map(resolveCompletion));

    expectAutoImportCompletion(resolvedCompletions, '../source_file1.dart');
    expectAutoImportCompletion(resolvedCompletions, '../source_file2.dart');
    expectAutoImportCompletion(resolvedCompletions, '../source_file3.dart');
  }

  Future<void> test_suggestionSets_enumValues() async {
    newFile(
      join(projectFolderPath, 'source_file.dart'),
      content: '''
      enum MyExportedEnum { One, Two }
      ''',
    );

    final content = '''
main() {
  var a = MyExported^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final enumCompletions =
        res.where((c) => c.label.startsWith('MyExportedEnum')).toList();
    expect(
        enumCompletions.map((c) => c.label),
        unorderedEquals(
            ['MyExportedEnum', 'MyExportedEnum.One', 'MyExportedEnum.Two']));

    final completion =
        enumCompletions.singleWhere((c) => c.label == 'MyExportedEnum.One');

    // Resolve the completion item (via server) to get its edits. This is the
    // LSP's equiv of getSuggestionDetails() and is invoked by LSP clients to
    // populate additional info (in our case, the additional edits for inserting
    // the import).
    final resolved = await resolveCompletion(completion);
    expect(resolved, isNotNull);

    // Ensure the detail field was update to show this will auto-import.
    expect(
        resolved.detail, startsWith("Auto import from '../source_file.dart'"));

    // Ensure the edit was added on.
    expect(resolved.textEdit, isNotNull);

    // Apply both the main completion edit and the additionalTextEdits atomically.
    final newContent = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );

    // Ensure both edits were made - the completion, and the inserted import.
    expect(newContent, equals('''
import '../source_file.dart';

main() {
  var a = MyExportedEnum.One
}
    '''));
  }

  Future<void> test_suggestionSets_enumValuesAlreadyImported() async {
    newFile(
      join(projectFolderPath, 'lib', 'source_file.dart'),
      content: '''
      enum MyExportedEnum { One, Two }
      ''',
    );
    newFile(
      join(projectFolderPath, 'lib', 'reexport1.dart'),
      content: '''
      export 'source_file.dart';
      ''',
    );
    newFile(
      join(projectFolderPath, 'lib', 'reexport2.dart'),
      content: '''
      export 'source_file.dart';
      ''',
    );

    final content = '''
import 'reexport1.dart';

main() {
  var a = MyExported^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final completions =
        res.where((c) => c.label == 'MyExportedEnum.One').toList();
    expect(completions, hasLength(1));
    final resolved = await resolveCompletion(completions.first);
    // It should not include auto-import text since it's already imported.
    expect(resolved.detail, isNull);
  }

  Future<void> test_suggestionSets_filtersOutAlreadyImportedSymbols() async {
    newFile(
      join(projectFolderPath, 'lib', 'source_file.dart'),
      content: '''
      class MyExportedClass {}
      ''',
    );
    newFile(
      join(projectFolderPath, 'lib', 'reexport1.dart'),
      content: '''
      export 'source_file.dart';
      ''',
    );
    newFile(
      join(projectFolderPath, 'lib', 'reexport2.dart'),
      content: '''
      export 'source_file.dart';
      ''',
    );

    final content = '''
import 'reexport1.dart';

main() {
  MyExported^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final completions = res.where((c) => c.label == 'MyExportedClass').toList();
    expect(completions, hasLength(1));
    final resolved = await resolveCompletion(completions.first);
    // It should not include auto-import text since it's already imported.
    expect(resolved.detail, isNull);
  }

  Future<void>
      test_suggestionSets_includesReexportedSymbolsForEachFile() async {
    newFile(
      join(projectFolderPath, 'source_file.dart'),
      content: '''
      class MyExportedClass {}
      ''',
    );
    newFile(
      join(projectFolderPath, 'reexport1.dart'),
      content: '''
      export 'source_file.dart';
      ''',
    );
    newFile(
      join(projectFolderPath, 'reexport2.dart'),
      content: '''
      export 'source_file.dart';
      ''',
    );

    final content = '''
main() {
  MyExported^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final completions = res.where((c) => c.label == 'MyExportedClass').toList();
    expect(completions, hasLength(3));

    // Resolve the completions so we can get the auto-import text.
    final resolvedCompletions =
        await Future.wait(completions.map(resolveCompletion));

    expectAutoImportCompletion(resolvedCompletions, '../source_file.dart');
    expectAutoImportCompletion(resolvedCompletions, '../reexport1.dart');
    expectAutoImportCompletion(resolvedCompletions, '../reexport2.dart');
  }

  Future<void> test_suggestionSets_insertReplaceRanges() async {
    newFile(
      join(projectFolderPath, 'other_file.dart'),
      content: '''
      /// This class is in another file.
      class InOtherFile {}
      ''',
    );

    final content = '''
main() {
  InOtherF^il
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
      textDocumentCapabilities: withCompletionItemInsertReplaceSupport(
          emptyTextDocumentClientCapabilities),
      workspaceCapabilities:
          withApplyEditSupport(emptyWorkspaceClientCapabilities),
    );
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    // Find the completion for the class in the other file.
    final completion = res.singleWhere((c) => c.label == 'InOtherFile');
    expect(completion, isNotNull);

    // Expect no docs or text edit, since these are added during resolve.
    expect(completion.documentation, isNull);
    expect(completion.textEdit, isNull);

    // Resolve the completion item (via server) to get its edits. This is the
    // LSP's equiv of getSuggestionDetails() and is invoked by LSP clients to
    // populate additional info (in our case, the additional edits for inserting
    // the import).
    final resolved = await resolveCompletion(completion);
    expect(resolved, isNotNull);

    // Ensure the detail field was update to show this will auto-import.
    expect(
        resolved.detail, startsWith("Auto import from '../other_file.dart'"));

    // Ensure the doc comment was added.
    expect(
      resolved.documentation.valueEquals('This class is in another file.'),
      isTrue,
    );

    // Ensure the edit was added on.
    expect(resolved.textEdit, isNotNull);

    // There should be no command for this item because it doesn't need imports
    // in other files. Same-file completions are in additionalEdits.
    expect(resolved.command, isNull);

    // Apply both the main completion edit and the additionalTextEdits atomically
    // then check the contents.

    final newContentReplaceMode = applyTextEdits(
      withoutMarkers(content),
      [textEditForReplace(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );
    final newContentInsertMode = applyTextEdits(
      withoutMarkers(content),
      [textEditForInsert(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );

    // Ensure both edits were made - the completion, and the inserted import.
    expect(newContentReplaceMode, equals('''
import '../other_file.dart';

main() {
  InOtherFile
}
    '''));
    // In insert mode, we'd have the trailing "il" still after the caret.
    expect(newContentInsertMode, equals('''
import '../other_file.dart';

main() {
  InOtherFileil
}
    '''));
  }

  Future<void> test_suggestionSets_insertsIntoPartFiles() async {
    // File we'll be adding an import for.
    newFile(
      join(projectFolderPath, 'other_file.dart'),
      content: 'class InOtherFile {}',
    );

    // File that will have the import added.
    final parentContent = '''part 'main.dart';''';
    final parentFilePath = newFile(
      join(projectFolderPath, 'lib', 'parent.dart'),
      content: parentContent,
    ).path;

    // File that we're invoking completion in.
    final content = '''
part of 'parent.dart';
main() {
  InOtherF^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final completion = res.singleWhere((c) => c.label == 'InOtherFile');
    expect(completion, isNotNull);

    // Resolve the completion item to get its edits.
    final resolved = await resolveCompletion(completion);
    expect(resolved, isNotNull);
    // Ensure it has a command, since it will need to make edits in other files
    // and that's done by telling the server to send a workspace/applyEdit. LSP
    // doesn't currently support these other-file edits in the completion.
    // See https://github.com/microsoft/language-server-protocol/issues/749
    expect(resolved.command, isNotNull);

    // Apply all current-document edits.
    final newContent = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );
    expect(newContent, equals('''
part of 'parent.dart';
main() {
  InOtherFile
}
    '''));

    // Execute the associated command (which will handle edits in other files).
    ApplyWorkspaceEditParams editParams;
    final commandResponse = await handleExpectedRequest<Object,
        ApplyWorkspaceEditParams, ApplyWorkspaceEditResponse>(
      Method.workspace_applyEdit,
      ApplyWorkspaceEditParams.fromJson,
      () => executeCommand(resolved.command),
      handler: (edit) {
        // When the server sends the edit back, just keep a copy and say we
        // applied successfully (it'll be verified below).
        editParams = edit;
        return ApplyWorkspaceEditResponse(applied: true);
      },
    );
    // Successful edits return an empty success() response.
    expect(commandResponse, isNull);

    // Ensure the edit came back.
    expect(editParams, isNotNull);
    expect(editParams.edit.changes, isNotNull);

    // Ensure applying the changes will give us the expected content.
    final contents = {
      parentFilePath: withoutMarkers(parentContent),
    };
    applyChanges(contents, editParams.edit.changes);

    // Check the parent file was modified to include the import by the edits
    // that came from the server.
    expect(contents[parentFilePath], equals('''
import '../other_file.dart';

part 'main.dart';'''));
  }

  Future<void> test_suggestionSets_members() async {
    newFile(
      join(projectFolderPath, 'source_file.dart'),
      content: '''
      class MyExportedClass {
        DateTime myInstanceDateTime;
        static DateTime myStaticDateTimeField;
        static DateTime get myStaticDateTimeGetter => null;
      }
      ''',
    );

    final content = '''
main() {
  var a = MyExported^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    final completions =
        res.where((c) => c.label.startsWith('MyExportedClass')).toList();
    expect(
        completions.map((c) => c.label),
        unorderedEquals([
          'MyExportedClass',
          'MyExportedClass()',
          // The instance field should not show up.
          'MyExportedClass.myStaticDateTimeField',
          'MyExportedClass.myStaticDateTimeGetter'
        ]));

    final completion = completions
        .singleWhere((c) => c.label == 'MyExportedClass.myStaticDateTimeField');

    // Resolve the completion item (via server) to get its edits. This is the
    // LSP's equiv of getSuggestionDetails() and is invoked by LSP clients to
    // populate additional info (in our case, the additional edits for inserting
    // the import).
    final resolved = await resolveCompletion(completion);
    expect(resolved, isNotNull);

    // Ensure the detail field was update to show this will auto-import.
    expect(
        resolved.detail, startsWith("Auto import from '../source_file.dart'"));

    // Ensure the edit was added on.
    expect(resolved.textEdit, isNotNull);

    // Apply both the main completion edit and the additionalTextEdits atomically.
    final newContent = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );

    // Ensure both edits were made - the completion, and the inserted import.
    expect(newContent, equals('''
import '../source_file.dart';

main() {
  var a = MyExportedClass.myStaticDateTimeField
}
    '''));
  }

  /// This test reproduces a bug where the pathKey hash used in
  /// available_declarations.dart would not change with the contents of the file
  /// (as it always used 0 as the modification stamp) which would prevent
  /// completion including items from files that were open (had overlays).
  /// https://github.com/Dart-Code/Dart-Code/issues/2286#issuecomment-658597532
  Future<void> test_suggestionSets_modifiedFiles() async {
    final otherFilePath = join(projectFolderPath, 'lib', 'other_file.dart');
    final otherFileUri = Uri.file(otherFilePath);

    final mainFileContent = 'MyOtherClass^';
    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(mainFileContent));
    await initialAnalysis;

    // Start with a blank file.
    newFile(otherFilePath, content: '');
    await openFile(otherFileUri, '');
    await pumpEventQueue(times: 5000);

    // Reopen the file with a class definition.
    await closeFile(otherFileUri);
    await openFile(otherFileUri, 'class MyOtherClass {}');
    await pumpEventQueue(times: 5000);

    // Ensure the class appears in completion.
    final completions =
        await getCompletion(mainFileUri, positionFromMarker(mainFileContent));
    final matching =
        completions.where((c) => c.label == 'MyOtherClass').toList();
    expect(matching, hasLength(1));
  }

  Future<void> test_suggestionSets_namedConstructors() async {
    newFile(
      join(projectFolderPath, 'other_file.dart'),
      content: '''
      /// This class is in another file.
      class InOtherFile {
        InOtherFile.fromJson() {}
      }
      ''',
    );

    final content = '''
main() {
  var a = InOtherF^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize(
        workspaceCapabilities:
            withApplyEditSupport(emptyWorkspaceClientCapabilities));
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    // Find the completion for the class in the other file.
    final completion =
        res.singleWhere((c) => c.label == 'InOtherFile.fromJson()');
    expect(completion, isNotNull);

    // Expect no docs or text edit, since these are added during resolve.
    expect(completion.documentation, isNull);
    expect(completion.textEdit, isNull);

    // Resolve the completion item (via server) to get its edits. This is the
    // LSP's equiv of getSuggestionDetails() and is invoked by LSP clients to
    // populate additional info (in our case, the additional edits for inserting
    // the import).
    final resolved = await resolveCompletion(completion);
    expect(resolved, isNotNull);

    // Apply both the main completion edit and the additionalTextEdits atomically.
    final newContent = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(resolved.textEdit)]
          .followedBy(resolved.additionalTextEdits)
          .toList(),
    );

    // Ensure both edits were made - the completion, and the inserted import.
    expect(newContent, equals('''
import '../other_file.dart';

main() {
  var a = InOtherFile.fromJson
}
    '''));
  }

  Future<void> test_suggestionSets_unavailableIfDisabled() async {
    newFile(
      join(projectFolderPath, 'other_file.dart'),
      content: 'class InOtherFile {}',
    );

    final content = '''
main() {
  InOtherF^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    // Support applyEdit, but explicitly disable the suggestions.
    await initialize(
      initializationOptions: {'suggestFromUnimportedLibraries': false},
      workspaceCapabilities:
          withApplyEditSupport(emptyWorkspaceClientCapabilities),
    );
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    // Ensure the item doesn't appear in the results (because we might not
    // be able to execute the import edits if they're in another file).
    final completion = res.singleWhere(
      (c) => c.label == 'InOtherFile',
      orElse: () => null,
    );
    expect(completion, isNull);
  }

  Future<void> test_suggestionSets_unavailableWithoutApplyEdit() async {
    // If client doesn't advertise support for workspace/applyEdit, we won't
    // include suggestion sets.
    newFile(
      join(projectFolderPath, 'other_file.dart'),
      content: 'class InOtherFile {}',
    );

    final content = '''
main() {
  InOtherF^
}
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await initialize();
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;
    final res = await getCompletion(mainFileUri, positionFromMarker(content));

    // Ensure the item doesn't appear in the results (because we might not
    // be able to execute the import edits if they're in another file).
    final completion = res.singleWhere(
      (c) => c.label == 'InOtherFile',
      orElse: () => null,
    );
    expect(completion, isNull);
  }

  Future<void> test_unopenFile() async {
    final content = '''
    class MyClass {
      String abcdefghij;
    }

    main() {
      MyClass a;
      a.abc^
    }
    ''';

    newFile(mainFilePath, content: withoutMarkers(content));
    await initialize();
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    expect(res.any((c) => c.label == 'abcdefghij'), isTrue);
    final item = res.singleWhere((c) => c.label == 'abcdefghij');
    expect(item.insertTextFormat,
        anyOf(equals(InsertTextFormat.PlainText), isNull));
    expect(item.insertText, anyOf(equals('abcdefghij'), isNull));
    final updated = applyTextEdits(
      withoutMarkers(content),
      [toTextEdit(item.textEdit)],
    );
    expect(updated, contains('a.abcdefghij'));
  }
}

@reflectiveTest
class CompletionTestWithNullSafetyTest extends AbstractLspAnalysisServerTest {
  @override
  String get testPackageLanguageVersion => latestLanguageVersion;

  Future<void> test_completeFunctionCalls_requiredNamed() async {
    final content = '''
    void myFunction(String a, int b, {required String c, String d = ''}) {}

    main() {
      [[myFu^]]
    }
    ''';

    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities:
            withConfigurationSupport(emptyWorkspaceClientCapabilities),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'myFunction(…)');
    // Ensure the snippet comes through in the expected format with the expected
    // placeholders.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals(r'myFunction(${1:a}, ${2:b}, c: ${3:c})'));
    final textEdit = toTextEdit(item.textEdit);
    expect(textEdit.newText, equals(item.insertText));
    expect(textEdit.range, equals(rangeFromMarkers(content)));
  }

  Future<void> test_completeFunctionCalls_requiredNamed_suggestionSet() async {
    final otherFile = join(projectFolderPath, 'lib', 'other.dart');
    newFile(
      otherFile,
      content:
          "void myFunction(String a, int b, {required String c, String d = ''}) {}",
    );
    final content = '''
    main() {
      [[myFu^]]
    }
    ''';

    final initialAnalysis = waitForAnalysisComplete();
    await provideConfig(
      () => initialize(
        textDocumentCapabilities: withCompletionItemSnippetSupport(
            emptyTextDocumentClientCapabilities),
        workspaceCapabilities: withApplyEditSupport(
            withConfigurationSupport(emptyWorkspaceClientCapabilities)),
      ),
      {'completeFunctionCalls': true},
    );
    await openFile(mainFileUri, withoutMarkers(content));
    await initialAnalysis;

    final res = await getCompletion(mainFileUri, positionFromMarker(content));
    final item = res.singleWhere((c) => c.label == 'myFunction(…)');
    // Ensure the snippet comes through in the expected format with the expected
    // placeholders.
    expect(item.insertTextFormat, equals(InsertTextFormat.Snippet));
    expect(item.insertText, equals(r'myFunction(${1:a}, ${2:b}, c: ${3:c})'));
    expect(item.textEdit, isNull);

    // Ensure the item can be resolved and gets a proper TextEdit.
    final resolved = await resolveCompletion(item);
    expect(resolved.textEdit, isNotNull);
    final textEdit = toTextEdit(resolved.textEdit);
    expect(textEdit.newText, equals(item.insertText));
    expect(textEdit.range, equals(rangeFromMarkers(content)));
  }
}