[analysis_server] Fix change_method_signature tests to normalize code

+ remove unnecessary setting of `useLineEndingsForPlatform` from a few more tests.

Change-Id: I9959a5c476a964b3a53ee68842b056c486656d92
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/443802
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Auto-Submit: Danny Tuppeny <danny@tuppeny.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>

pkg/analysis_server/test/abstract_context.dart

diff --git a/pkg/analysis_server/test/abstract_context.dart b/pkg/analysis_server/test/abstract_context.dart
index 06caafb..7ac510d 100644
--- a/pkg/analysis_server/test/abstract_context.dart
+++ b/pkg/analysis_server/test/abstract_context.dart
@@ -58,6 +58,9 @@
 
   List<String> get collectionIncludedPaths => [workspaceRootPath];
 
+  /// The line terminator being used for test files and to be expected in edits.
+  String get eol => testEol;
+
   /// Return a list of the experiments that are to be enabled for tests in this
   /// class, an empty list if there are no experiments that should be enabled.
   List<String> get experiments => experimentsForTests;

pkg/analysis_server/test/services/refactoring/agnostic/change_method_signature_test.dart

diff --git a/pkg/analysis_server/test/services/refactoring/agnostic/change_method_signature_test.dart b/pkg/analysis_server/test/services/refactoring/agnostic/change_method_signature_test.dart
index 925375f..276b653 100644
--- a/pkg/analysis_server/test/services/refactoring/agnostic/change_method_signature_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/agnostic/change_method_signature_test.dart
@@ -17,6 +17,7 @@
 import 'package:analyzer/source/source_range.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/summary2/reference.dart';
+import 'package:analyzer/src/test_utilities/platform.dart';
 import 'package:analyzer/src/test_utilities/test_code_format.dart';
 import 'package:analyzer/src/utilities/extensions/file_system.dart';
 import 'package:analyzer/utilities/package_config_file_builder.dart';
@@ -39,15 +40,9 @@
   late final SelectionState selectionState;
   late final ValidSelectionState validSelectionState;
 
-  @override
-  void setUp() {
-    useLineEndingsForPlatform = false;
-    super.setUp();
-  }
-
   /// Create [testFile] with [rawCode], analyze availability in it.
   Future<Availability> _analyzeAvailability(String rawCode) async {
-    var testCode = TestCode.parse(rawCode);
+    var testCode = TestCode.parseNormalized(rawCode);
     newFile(testFile.path, testCode.code);
 
     await _buildRefactoringContext(file: testFile, testCode: testCode);
@@ -159,12 +154,6 @@
 @reflectiveTest
 class ChangeMethodSignatureTest_analyzeSelection
     extends AbstractChangeMethodSignatureTest {
-  @override
-  void setUp() {
-    useLineEndingsForPlatform = false;
-    super.setUp();
-  }
-
   Future<void> test_classConstructor_fieldFormal_explicitType() async {
     await _analyzeSelection(r'''
 class A {
@@ -3241,6 +3230,7 @@
     MethodSignatureUpdate signatureUpdate,
     String expected,
   ) async {
+    expected = normalizeNewlinesForPlatform(expected);
     var builder = ChangeBuilder(
       session: refactoringContext.session,
       defaultEol: refactoringContext.utils.endOfLine,
@@ -3260,7 +3250,8 @@
           sourceChange: builder.sourceChange,
         );
       case ChangeStatusFailure():
-        buffer.writeln('${status.runtimeType}');
+        buffer.write('${status.runtimeType}');
+        buffer.write(eol);
     }
 
     _assertTextExpectation(buffer.toString(), expected);
@@ -3273,7 +3264,8 @@
     var fileEdits = sourceChange.edits.sortedBy((e) => e.file);
     for (var fileEdit in fileEdits) {
       var file = getFile(fileEdit.file);
-      buffer.writeln('>>>>>>> ${file.posixPath}');
+      buffer.write('>>>>>>> ${file.posixPath}');
+      buffer.write(eol);
       var current = file.readAsStringSync();
       var updated = SourceEdit.applySequence(current, fileEdit.edits);
       buffer.write(updated);

pkg/analysis_server/test/src/services/correction/fix/fix_processor.dart

diff --git a/pkg/analysis_server/test/src/services/correction/fix/fix_processor.dart b/pkg/analysis_server/test/src/services/correction/fix/fix_processor.dart
index 8aae063..703bcb8 100644
--- a/pkg/analysis_server/test/src/services/correction/fix/fix_processor.dart
+++ b/pkg/analysis_server/test/src/services/correction/fix/fix_processor.dart
@@ -39,6 +39,12 @@
     return DartChangeWorkspace([await session]);
   }
 
+  @override
+  void setUp() {
+    super.setUp();
+    verifyNoTestUnitErrors = false;
+  }
+
   /// Computes fixes for the given [diagnostic] in [testUnit].
   Future<List<Fix>> _computeFixes(Diagnostic diagnostic) async {
     var libraryResult = testLibraryResult;
@@ -276,13 +282,6 @@
     return fixes;
   }
 
-  @override
-  void setUp() {
-    super.setUp();
-    verifyNoTestUnitErrors = false;
-    useLineEndingsForPlatform = true;
-  }
-
   /// Computes fixes for the given [diagnostic] in [testUnit].
   @override
   Future<List<Fix>> _computeFixes(
@@ -319,13 +318,6 @@
     kinds.sort((a, b) => b.priority.compareTo(a.priority));
     expect(kinds, containsAllInOrder(fixKinds));
   }
-
-  @override
-  void setUp() {
-    super.setUp();
-    verifyNoTestUnitErrors = false;
-    useLineEndingsForPlatform = true;
-  }
 }
 
 /// A base class defining support for writing fix processor tests that are
@@ -504,13 +496,6 @@
     }).toList();
   }
 
-  @override
-  void setUp() {
-    super.setUp();
-    verifyNoTestUnitErrors = false;
-    useLineEndingsForPlatform = true;
-  }
-
   /// Computes fixes, verifies that there is a fix for the given [diagnostic] of
   /// the appropriate kind, and returns the fix.
   ///