Make Assets know their ID.

pkg/barback/test/asset_set_test.dart

Index: pkg/barback/test/asset_set_test.dart
diff --git a/pkg/barback/test/asset_set_test.dart b/pkg/barback/test/asset_set_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6cb1eb8385814636cf3d0b69f154c9fe218399b5
--- /dev/null
+++ b/pkg/barback/test/asset_set_test.dart
@@ -0,0 +1,112 @@
+// 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.asset_set_test;
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:barback/barback.dart';
+import 'package:barback/src/asset_set.dart';
+import 'package:unittest/unittest.dart';
+
+import 'utils.dart';
+
+main() {
+  initConfig();
+
+  var fooId = new AssetId.parse("app|foo.txt");
+  var barId = new AssetId.parse("app|bar.txt");
+
+  group("[] operator", () {
+    test("gets an asset with the given ID", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      set.add(foo);
+
+      expect(set[fooId], equals(foo));
+    });
+
+    test("returns null if no asset with the ID is in the set", () {
+      var set = new AssetSet();
+      expect(set[fooId], isNull);
+    });
+  });
+
+  group(".add()", () {
+    test("adds the asset to the set", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      set.add(foo);
+      expect(set.contains(foo), isTrue);
+    });
+
+    test("replaces a previously added asset with that ID", () {
+      var set = new AssetSet();
+      set.add(new MockAsset(fooId, "before"));
+      set.add(new MockAsset(fooId, "after"));
+      expect(set[fooId].contents, equals("after"));
+    });
+
+    test("returns the added item", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      expect(set.add(foo), equals(foo));
+    });
+  });
+
+  group(".addAll()", () {
+    test("adds the assets to the set", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      var bar = new MockAsset(barId, "bar");
+      set.addAll([foo, bar]);
+      expect(set.contains(foo), isTrue);
+      expect(set.contains(bar), isTrue);
+    });
+
+    test("replaces assets earlier in the sequence with later ones", () {
+      var set = new AssetSet();
+      var foo1 = new MockAsset(fooId, "before");
+      var foo2 = new MockAsset(fooId, "after");
+      set.addAll([foo1, foo2]);
+      expect(set[fooId].contents, equals("after"));
+    });
+  });
+
+  group(".clear()", () {
+    test("empties the set", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      set.add(foo);
+      set.clear();
+
+      expect(set.length, equals(0));
+      expect(set.contains(foo), isFalse);
+    });
+  });
+
+  group(".contains()", () {
+    test("returns true if the asset is in the set", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      var bar = new MockAsset(barId, "bar");
+      set.add(foo);
+
+      expect(set.contains(foo), isTrue);
+      expect(set.contains(bar), isFalse);
+    });
+  });
+
+  group(".containsId()", () {
+    test("returns true if an asset with the ID is in the set", () {
+      var set = new AssetSet();
+      var foo = new MockAsset(fooId, "foo");
+      set.add(foo);
+
+      expect(set.containsId(fooId), isTrue);
+      expect(set.containsId(barId), isFalse);
+    });
+  });
+}