test/transformer/prints_a_transform_interface_error_test.dart

// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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/test.dart';

import '../descriptor.dart' as d;
import '../serve/utils.dart';
import '../test_pub.dart';

final transformer = """
import 'dart:async';

import 'package:barback/barback.dart';

class RewriteTransformer extends Transformer {
  RewriteTransformer.asPlugin();

  String get allowedExtensions => '.txt';
}
""";

main() {
  test("prints a transform interface error", () async {
    await serveBarback();

    await d.dir(appPath, [
      d.pubspec({
        "name": "myapp",
        "transformers": ["myapp/src/transformer"],
        "dependencies": {"barback": "any"}
      }),
      d.dir("lib", [
        d.dir("src", [d.file("transformer.dart", transformer)])
      ]),
      d.dir("web", [d.file("foo.txt", "foo")])
    ]).create();

    await pubGet();
    var server = await pubServe();
    await expectLater(
        server.stderr,
        emitsThrough(emitsLines("Build error:\n"
            "Transform Rewrite on myapp|web/foo.txt threw error: Class "
            "'RewriteTransformer' has no instance method 'apply'.")));
    await endPubServe();
  });
}