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packages/barback/test/transformer_test.dart

Index: packages/barback/test/transformer_test.dart
diff --git a/packages/barback/test/transformer_test.dart b/packages/barback/test/transformer_test.dart
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+// Copyright (c) 2013, 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.
+
+library barback.test.transformer_test;
+
+import 'dart:async';
+
+import 'package:barback/barback.dart';
+import 'package:barback/src/utils.dart';
+import 'package:unittest/unittest.dart';
+
+import 'utils.dart';
+
+main() {
+  initConfig();
+
+  group("isPrimary", () {
+    test("defaults to allowedExtensions", () {
+      var transformer = new ExtensionTransformer(".txt .bin");
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.txt")), isTrue);
+
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.bin")), isTrue);
+
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.nottxt")), isFalse);
+    });
+
+    test("supports multi-level extensions with allowedExtensions", () {
+      var transformer = new ExtensionTransformer(".dart.js");
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.dart.js")), isTrue);
+
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.js")), isFalse);
+
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.dart")), isFalse);
+    });
+
+    test("throws an error for extensions without periods", () {
+      expect(() => new ExtensionTransformer("dart"), throwsFormatException);
+    });
+
+    test("allows all files if allowedExtensions is not overridden", () {
+      var transformer = new MockTransformer();
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.txt")), isTrue);
+
+      expect(transformer.isPrimary(new AssetId("pkg", "foo.bin")), isTrue);
+
+      expect(transformer.isPrimary(new AssetId("pkg", "anything")), isTrue);
+    });
+  });
+}
+
+class MockTransformer extends Transformer {
+  MockTransformer();
+
+  Future apply(Transform transform) => new Future.value();
+}
+
+class ExtensionTransformer extends Transformer {
+  final String allowedExtensions;
+
+  ExtensionTransformer(this.allowedExtensions);
+
+  Future apply(Transform transform) => new Future.value();
+}