tests/compiler/dart2js/codegen/tree_shaking_test.dart

// Copyright (c) 2012, 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:expect/expect.dart";
import "package:async_helper/async_helper.dart";
import '../compiler_helper.dart';

const String TEST = r"""
class A {
  foo() => bar();
  bar() => 42;
}
class B extends A {
  bar() => 54;
}
class C implements A {
  bar() => 68;
}
main() {
  new A();
  new B();
  new C();
  new A().foo();
}
""";

void main() {
  runTest({bool useKernel}) async {
    String generated = await compileAll(TEST,
        compileMode: useKernel ? CompileMode.kernel : CompileMode.memory);
    Expect.isTrue(generated.contains('return 42'));
    Expect.isTrue(generated.contains('return 54'));
    Expect.isFalse(generated.contains('return 68'));
  }

  asyncTest(() async {
    print('--test from ast---------------------------------------------------');
    await runTest(useKernel: false);
    print('--test from kernel------------------------------------------------');
    await runTest(useKernel: true);
  });
}