sdk/pkg/analyzer/test/src/diagnostics/assignment_to_method_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:test_reflective_loader/test_reflective_loader.dart';

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

main() {
  defineReflectiveSuite(() {
    defineReflectiveTests(AssignmentToMethodTest);
    defineReflectiveTests(UpdateNodeTextExpectations);
  });
}

@reflectiveTest
class AssignmentToMethodTest extends PubPackageResolutionTest {
  test_instance_extendedHasMethod_extensionHasSetter() async {
    await resolveTestCodeWithDiagnostics(r'''
class C {
  void foo() {}
}

extension E on C {
  void set foo(int _) {}
}

void f(C c) {
  c.foo = 0;
//  ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  c.foo += 1;
//  ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  c.foo++;
//  ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  --c.foo;
//    ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
}
''');
  }

  test_prefixedIdentifier_instanceMethod() async {
    await resolveTestCodeWithDiagnostics(r'''
class A {
  void foo() {}
}

void f(A a) {
  a.foo = 0;
//  ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  a.foo += 1;
//  ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  a.foo++;
//  ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  ++a.foo;
//    ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
}
''');
  }

  test_propertyAccess_instanceMethod() async {
    await resolveTestCodeWithDiagnostics(r'''
class A {
  void foo() {}
}

void f(A a) {
  (a).foo = 0;
//    ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  (a).foo += 1;
//    ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  (a).foo++;
//    ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  ++(a).foo;
//      ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
}
''');
  }

  test_this_extendedHasMethod_extensionHasSetter() async {
    await resolveTestCodeWithDiagnostics(r'''
class C {
  void foo() {}
}

extension E on C {
  void set foo(int _) {}

  f() {
    this.foo = 0;
//       ^^^
// [diag.assignmentToMethod] Methods can't be assigned a value.
  }
}
''');
  }
}