pkg/linter/test/rules/avoid_empty_else_test.dart

// Copyright (c) 2023, 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:analyzer/src/dart/error/syntactic_errors.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../rule_test_support.dart';

void main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(AvoidEmptyElseTest);
  });
}

@reflectiveTest
class AvoidEmptyElseTest extends LintRuleTest {
  @override
  String get lintRule => LintNames.avoid_empty_else;

  test_else_emptyStatement_hasElseIf() async {
    await assertDiagnostics(
      r'''
void f() {
  var x = 0;
  var y = 1;
  if (x > y)
    print('');
  else if (x < y)
    print('');
  else ;
    print('');
}
''',
      [lint(105, 1)],
    );
  }

  test_else_emptyStatement_noElseIf() async {
    await assertDiagnostics(
      r'''
void f() {
  var x = 0;
  var y = 1;
  if (x > y)
    print('');
  else ;
    print('');
}
''',
      [lint(72, 1)],
    );
  }

  test_else_noEmptyStatement_enclosed() async {
    await assertNoDiagnostics(r'''
void f() {
  var x = 0;
  var y = 1;
  if (x > y) {
    print('');
  } else {
    print('');
  }
}
''');
  }

  test_else_noEmptyStatement_notEnclosed() async {
    await assertNoDiagnostics(r'''
void f() {
  var x = 0;
  var y = 1;
  if (x > y)
    print('');
  else
    print('');
}
''');
  }

  test_else_noStatement_notEnclosed() async {
    await assertDiagnostics(
      r'''
void f() {
  var x = 0;
  var y = 1;
  if (x > y)
    print('');
  else
}
''',
      [
        // No lint
        error(ParserErrorCode.expectedToken, 67, 4),
        error(ParserErrorCode.missingIdentifier, 72, 1),
      ],
    );
  }
}