pkg/analyzer/test/src/diagnostics/assignment_to_final_local_test.dart

// Copyright (c) 2019, 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/hint_codes.dart';
import 'package:analyzer/src/error/codes.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';

import '../dart/resolution/context_collection_resolution.dart';

main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(AssignmentToFinalLocalTest);
    defineReflectiveTests(AssignmentToFinalLocalWithNullSafetyTest);
  });
}

@reflectiveTest
class AssignmentToFinalLocalTest extends PubPackageResolutionTest {
  test_localVariable() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  x = 1;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 23, 1),
    ]);
  }

  test_localVariable_inForEach() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  for (x in <int>[1, 2]) {
    print(x);
  }
}''', [
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 28, 1),
    ]);
  }

  test_localVariable_plusEq() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  x += 1;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 23, 1),
    ]);
  }

  test_parameter() async {
    await assertErrorsInCode('''
f(final x) {
  x = 1;
}''', [
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 15, 1),
    ]);
  }

  test_postfixMinusMinus() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  x--;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 23, 1),
    ]);
  }

  test_postfixPlusPlus() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  x++;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 23, 1),
    ]);
  }

  test_prefixMinusMinus() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  --x;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 25, 1),
    ]);
  }

  test_prefixPlusPlus() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  ++x;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 25, 1),
    ]);
  }

  test_suffixMinusMinus() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  x--;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 23, 1),
    ]);
  }

  test_suffixPlusPlus() async {
    await assertErrorsInCode('''
f() {
  final x = 0;
  x++;
}''', [
      error(HintCode.UNUSED_LOCAL_VARIABLE, 14, 1),
      error(CompileTimeErrorCode.ASSIGNMENT_TO_FINAL_LOCAL, 23, 1),
    ]);
  }
}

@reflectiveTest
class AssignmentToFinalLocalWithNullSafetyTest extends PubPackageResolutionTest
    with WithNullSafetyMixin {
  test_localVariable_late() async {
    await assertNoErrorsInCode('''
void f() {
  late final int a;
  a = 1;
  a;
}
''');
  }
}