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packages/barback/test/package_graph/transform/cross_package_test.dart

Index: packages/barback/test/package_graph/transform/cross_package_test.dart
diff --git a/packages/barback/test/package_graph/transform/cross_package_test.dart b/packages/barback/test/package_graph/transform/cross_package_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b499604680d968d767eb3ad36e6d30af09b0a8c6
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+++ b/packages/barback/test/package_graph/transform/cross_package_test.dart
@@ -0,0 +1,193 @@
+// Copyright (c) 2014, 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.package_graph.transform.pass_through_test;
+
+import 'package:barback/src/utils.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../utils.dart';
+
+main() {
+  initConfig();
+  test("can access other packages' source assets", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "a"
+    }, {"pkg1": [[new ManyToOneTransformer("txt")]]});
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "a");
+    buildShouldSucceed();
+  });
+
+  test("can access other packages' transformed assets", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.txt": "a"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]],
+      "pkg2": [[new RewriteTransformer("txt", "inc")]]
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.txt"]);
+    expectAsset("pkg1|a.out", "a.inc");
+    buildShouldSucceed();
+  });
+
+  test("re-runs a transform when an input from another package changes", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "a"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]]
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "a");
+    buildShouldSucceed();
+
+    modifyAsset("pkg2|a.inc", "new a");
+    updateSources(["pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "new a");
+    buildShouldSucceed();
+  });
+
+  test("re-runs a transform when a transformed input from another package "
+      "changes", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.txt": "a"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]],
+      "pkg2": [[new RewriteTransformer("txt", "inc")]]
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.txt"]);
+    expectAsset("pkg1|a.out", "a.inc");
+    buildShouldSucceed();
+
+    modifyAsset("pkg2|a.txt", "new a");
+    updateSources(["pkg2|a.txt"]);
+    expectAsset("pkg1|a.out", "new a.inc");
+    buildShouldSucceed();
+  });
+
+  test("doesn't complete the build until all packages' transforms are "
+      "finished running", () {
+    var transformer = new ManyToOneTransformer("txt");
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "a"
+    }, {
+      "pkg1": [[transformer]]
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "a");
+    buildShouldSucceed();
+
+    transformer.pauseApply();
+    modifyAsset("pkg2|a.inc", "new a");
+    updateSources(["pkg2|a.inc"]);
+    buildShouldNotBeDone();
+
+    transformer.resumeApply();
+    buildShouldSucceed();
+  });
+
+  test("runs a transform that's added because of a change in another package",
+      () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "b"
+    }, {
+      "pkg1": [
+        [new ManyToOneTransformer("txt")],
+        [new OneToManyTransformer("out")],
+        [new RewriteTransformer("md", "done")]
+      ],
+    });
+
+    // pkg1|a.txt generates outputs based on the contents of pkg2|a.inc. At
+    // first pkg2|a.inc only includes "b", which is not transformed. Then
+    // pkg2|a.inc is updated to include "b,c.md". pkg1|c.md triggers the
+    // md->done rewrite transformer, producing pkg1|c.done.
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|b", "spread out");
+    buildShouldSucceed();
+
+    modifyAsset("pkg2|a.inc", "b,c.md");
+    updateSources(["pkg2|a.inc"]);
+    expectAsset("pkg1|b", "spread out");
+    expectAsset("pkg1|c.done", "spread out.done");
+    buildShouldSucceed();
+  });
+
+  test("doesn't run a transform that's removed because of a change in "
+      "another package", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "b,c.md"
+    }, {
+      "pkg1": [
+        [new ManyToOneTransformer("txt")],
+        [new OneToManyTransformer("out")],
+        [new RewriteTransformer("md", "done")]
+      ],
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|b", "spread out");
+    expectAsset("pkg1|c.done", "spread out.done");
+    buildShouldSucceed();
+
+    modifyAsset("pkg2|a.inc", "b");
+    updateSources(["pkg2|a.inc"]);
+    expectAsset("pkg1|b", "spread out");
+    expectNoAsset("pkg1|c.done");
+    buildShouldSucceed();
+  });
+
+  test("sees a transformer that's newly applied to a cross-package "
+      "dependency", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "a"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]],
+      "pkg2": [[new CheckContentTransformer("b", " transformed")]]
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "a");
+    buildShouldSucceed();
+
+    modifyAsset("pkg2|a.inc", "b");
+    updateSources(["pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "b transformed");
+    buildShouldSucceed();
+  });
+
+  test("doesn't see a transformer that's newly not applied to a "
+      "cross-package dependency", () {
+    initGraph({
+      "pkg1|a.txt": "pkg2|a.inc",
+      "pkg2|a.inc": "a"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]],
+      "pkg2": [[new CheckContentTransformer("a", " transformed")]]
+    });
+
+    updateSources(["pkg1|a.txt", "pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "a transformed");
+    buildShouldSucceed();
+
+    modifyAsset("pkg2|a.inc", "b");
+    updateSources(["pkg2|a.inc"]);
+    expectAsset("pkg1|a.out", "b");
+    buildShouldSucceed();
+  });
+}