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packages/barback/test/package_graph/add_remove_transform_test.dart

Index: packages/barback/test/package_graph/add_remove_transform_test.dart
diff --git a/packages/barback/test/package_graph/add_remove_transform_test.dart b/packages/barback/test/package_graph/add_remove_transform_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d3839ee1e7aad1b0f546d73d76665c444446f350
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+++ b/packages/barback/test/package_graph/add_remove_transform_test.dart
@@ -0,0 +1,390 @@
+// 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.package_graph.transform_test;
+
+import 'package:barback/src/utils.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../utils.dart';
+
+main() {
+  initConfig();
+  test("a new transformer is applied to a matching asset", () {
+    initGraph(["app|foo.blub"]);
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blub", "foo");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[new RewriteTransformer("blub", "blab")]]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+  });
+
+  test("a new transformer is not applied to a non-matching asset", () {
+    initGraph(["app|foo.blub"]);
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blub", "foo");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[new RewriteTransformer("zip", "zap")]]);
+    expectAsset("app|foo.blub", "foo");
+    expectNoAsset("app|foo.zap");
+    buildShouldSucceed();
+  });
+
+  test("updateTransformers doesn't re-run an old transformer", () {
+    var rewrite = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.blub"], {"app": [[rewrite]]});
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[rewrite]]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    expect(rewrite.numRuns, completion(equals(1)));
+  });
+
+  test("updateTransformers re-runs old transformers in a new phase", () {
+    var rewrite1 = new RewriteTransformer("txt", "blub");
+    var rewrite2 = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.txt"], {"app": [[rewrite1], [rewrite2]]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.blab", "foo.blub.blab");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[rewrite2], [rewrite1]]);
+    expectAsset("app|foo.blub", "foo.blub");
+    expectNoAsset("app|foo.blab");
+    buildShouldSucceed();
+  });
+
+  test("updateTransformers re-runs an old transformer when a previous phase "
+      "changes", () {
+    var rewrite = new RewriteTransformer("txt", "out");
+    initGraph(["app|foo.txt"], {"app": [[], [rewrite]]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.out");
+    buildShouldSucceed();
+
+    updateTransformers("app", [
+      [new RewriteTransformer("txt", "txt")],
+      [rewrite]
+    ]);
+    expectAsset("app|foo.out", "foo.txt.out");
+    buildShouldSucceed();
+  });
+
+  test("a removed transformer is no longer applied", () {
+    initGraph(["app|foo.blub"], {"app": [
+      [new RewriteTransformer("blub", "blab")]
+    ]});
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    updateTransformers("app", []);
+    expectAsset("app|foo.blub", "foo");
+    expectNoAsset("app|foo.blab");
+    buildShouldSucceed();
+  });
+
+  test("a new transformer is pipelined", () {
+    var rewrite1 = new RewriteTransformer("source", "phase1");
+    var rewrite3 = new RewriteTransformer("phase2", "phase3");
+    initGraph(["app|foo.source"], {"app": [
+      [rewrite1],
+      [rewrite3]
+    ]});
+
+    updateSources(["app|foo.source"]);
+    expectNoAsset("app|foo.phase3");
+    buildShouldSucceed();
+
+    updateTransformers("app", [
+      [rewrite1],
+      [new RewriteTransformer("phase1", "phase2")],
+      [rewrite3]
+    ]);
+    expectAsset("app|foo.phase3", "foo.phase1.phase2.phase3");
+    buildShouldSucceed();
+  });
+
+  test("a removed transformer is un-pipelined", () {
+    var rewrite1 = new RewriteTransformer("source", "phase1");
+    var rewrite3 = new RewriteTransformer("phase2", "phase3");
+    initGraph(["app|foo.source"], {"app": [
+      [rewrite1],
+      [new RewriteTransformer("phase1", "phase2")],
+      [rewrite3]
+    ]});
+
+    updateSources(["app|foo.source"]);
+    expectAsset("app|foo.phase3", "foo.phase1.phase2.phase3");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[rewrite1], [rewrite3]]);
+    expectNoAsset("app|foo.phase3");
+    buildShouldSucceed();
+  });
+
+  test("a transformer is removed during isPrimary", () {
+    var rewrite = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.blub"], {"app": [[rewrite]]});
+
+    rewrite.pauseIsPrimary("app|foo.blub");
+    updateSources(["app|foo.blub"]);
+    // Ensure we're waiting on [rewrite.isPrimary].
+    schedule(pumpEventQueue);
+
+    updateTransformers("app", []);
+    rewrite.resumeIsPrimary("app|foo.blub");
+    expectAsset("app|foo.blub", "foo");
+    expectNoAsset("app|foo.blab");
+    buildShouldSucceed();
+  });
+
+  test("a transformer is removed during apply", () {
+    var rewrite = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.blub"], {"app": [[rewrite]]});
+
+    rewrite.pauseApply();
+    updateSources(["app|foo.blub"]);
+    // Ensure we're waiting on [rewrite.apply].
+    schedule(pumpEventQueue);
+
+    updateTransformers("app", []);
+    rewrite.resumeApply();
+    expectAsset("app|foo.blub", "foo");
+    expectNoAsset("app|foo.blab");
+    buildShouldSucceed();
+  });
+
+  test("a transformer is added to an existing phase during isPrimary", () {
+    var rewrite = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.blub", "app|bar.blib"], {"app": [[rewrite]]});
+
+    rewrite.pauseIsPrimary("app|foo.blub");
+    updateSources(["app|foo.blub", "app|bar.blib"]);
+    // Ensure we're waiting on [rewrite.isPrimary].
+    schedule(pumpEventQueue);
+
+    updateTransformers("app", [
+      [rewrite, new RewriteTransformer("blib", "blob")]
+    ]);
+    rewrite.resumeIsPrimary("app|foo.blub");
+    expectAsset("app|foo.blab", "foo.blab");
+    expectAsset("app|bar.blob", "bar.blob");
+    buildShouldSucceed();
+  });
+
+  test("a cross-package transform sees a new transformer in a new phase", () {
+    var rewrite = new RewriteTransformer("inc", "inc");
+    initGraph({
+      "pkg1|foo.txt": "pkg2|foo.inc",
+      "pkg2|foo.inc": "foo"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]],
+      "pkg2": [[rewrite]]
+    });
+
+    updateSources(["pkg1|foo.txt", "pkg2|foo.inc"]);
+    expectAsset("pkg1|foo.out", "foo.inc");
+    buildShouldSucceed();
+
+    updateTransformers("pkg2", [
+      [rewrite],
+      [new RewriteTransformer("inc", "inc")]
+    ]);
+    expectAsset("pkg1|foo.out", "foo.inc.inc");
+    buildShouldSucceed();
+  });
+
+  test("a cross-package transform doesn't see a removed transformer in a "
+      "removed phase", () {
+    var rewrite = new RewriteTransformer("inc", "inc");
+    initGraph({
+      "pkg1|foo.txt": "pkg2|foo.inc",
+      "pkg2|foo.inc": "foo"
+    }, {
+      "pkg1": [[new ManyToOneTransformer("txt")]],
+      "pkg2": [
+        [rewrite],
+        [new RewriteTransformer("inc", "inc")]
+      ]
+    });
+
+    updateSources(["pkg1|foo.txt", "pkg2|foo.inc"]);
+    expectAsset("pkg1|foo.out", "foo.inc.inc");
+    buildShouldSucceed();
+
+    updateTransformers("pkg2", [[rewrite]]);
+    expectAsset("pkg1|foo.out", "foo.inc");
+    buildShouldSucceed();
+  });
+
+  group("pass-through", () {
+    test("a new transformer can see pass-through assets", () {
+      var rewrite = new RewriteTransformer("zip", "zap");
+      initGraph(["app|foo.blub"], {"app": [[rewrite]]});
+
+      updateSources(["app|foo.blub"]);
+      buildShouldSucceed();
+
+      updateTransformers("app", [
+        [rewrite],
+        [new RewriteTransformer("blub", "blab")]
+      ]);
+      expectAsset("app|foo.blab", "foo.blab");
+      buildShouldSucceed();
+    });
+
+    test("a new transformer can overwrite an old asset", () {
+      var rewrite = new RewriteTransformer("zip", "zap");
+      initGraph(["app|foo.txt"], {"app": [[rewrite]]});
+
+      updateSources(["app|foo.txt"]);
+      expectAsset("app|foo.txt", "foo");
+      buildShouldSucceed();
+
+      // Add a transformer that will overwrite the previously-passed-through
+      // "foo.txt" asset. The transformed asset should be emitted, not the
+      // passed-through asset.
+      updateTransformers("app", [
+        [rewrite, new RewriteTransformer("txt", "txt")]
+      ]);
+      expectAsset("app|foo.txt", "foo.txt");
+      buildShouldSucceed();
+    });
+
+    test("passes an asset through when an overwriting transform is removed",
+        () {
+      initGraph(["app|foo.txt"], {
+        "app": [[new RewriteTransformer("txt", "txt")]]
+      });
+
+      updateSources(["app|foo.txt"]);
+      expectAsset("app|foo.txt", "foo.txt");
+      buildShouldSucceed();
+
+      updateTransformers("app", [[]]);
+      expectAsset("app|foo.txt", "foo");
+      buildShouldSucceed();
+    });
+
+    test("passes an asset through when its overwriting transform is removed "
+        "during apply", () {
+      var rewrite = new RewriteTransformer("txt", "txt");
+      initGraph(["app|foo.txt"], {"app": [[rewrite]]});
+
+      rewrite.pauseApply();
+      updateSources(["app|foo.txt"]);
+      expectAssetDoesNotComplete("app|foo.txt");
+
+      updateTransformers("app", [[]]);
+      rewrite.resumeApply();
+      expectAsset("app|foo.txt", "foo");
+      buildShouldSucceed();
+    });
+
+    test("doesn't pass an asset through when its overwriting transform is "
+        "removed during apply if another transform overwrites it", () {
+      var rewrite1 = new RewriteTransformer("txt", "txt");
+      var rewrite2 = new RewriteTransformer("txt", "txt");
+      initGraph(["app|foo.txt"], {"app": [[rewrite1, rewrite2]]});
+
+      rewrite1.pauseApply();
+      updateSources(["app|foo.txt"]);
+      expectAsset("app|foo.txt", "foo.txt");
+      // Ensure we're waiting on [rewrite1.apply]
+      schedule(pumpEventQueue);
+
+      updateTransformers("app", [[rewrite2]]);
+      rewrite1.resumeApply();
+      expectAsset("app|foo.txt", "foo.txt");
+      buildShouldSucceed();
+    });
+
+    test("doesn't pass an asset through when one overwriting transform is "
+        "removed if another transform still overwrites it", () {
+      var rewrite = new RewriteTransformer("txt", "txt");
+      initGraph(["app|foo.txt"], {"app": [[
+        rewrite,
+        new RewriteTransformer("txt", "txt")
+      ]]});
+
+      updateSources(["app|foo.txt"]);
+      // This could be either the output of [CheckContentTransformer] or
+      // [RewriteTransformer], depending which completes first.
+      expectAsset("app|foo.txt", anything);
+      buildShouldFail([isAssetCollisionException("app|foo.txt")]);
+
+      updateTransformers("app", [[rewrite]]);
+      expectAsset("app|foo.txt", "foo.txt");
+      buildShouldSucceed();
+    });
+  });
+
+  // Regression test.
+  test("a phase is added, then an input is removed and re-added", () {
+    var rewrite = new RewriteTransformer("txt", "mid");
+    initGraph(["app|foo.txt"], {
+      "app": [[rewrite]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.mid", "foo.mid");
+    buildShouldSucceed();
+
+    updateTransformers("app", [
+      [rewrite],
+      [new RewriteTransformer("mid", "out")]
+    ]);
+    expectAsset("app|foo.out", "foo.mid.out");
+    buildShouldSucceed();
+
+    removeSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.out");
+    buildShouldSucceed();
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.mid.out");
+    buildShouldSucceed();
+  });
+
+  // Regression test for issue 19540.
+  test("a phase is removed and then one of its inputs is updated", () {
+    // Have an empty first phase because the first phase is never removed.
+    initGraph(["app|foo.txt"], {
+      "app": [[], [new RewriteTransformer("txt", "out")]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.out");
+    buildShouldSucceed();
+
+    // First empty both phases. This allows the second phase to be considered
+    // idle even when its transformer is no longer running.
+    updateTransformers("app", [[], []]);
+    buildShouldSucceed();
+
+    // Now remove the second phase. It should unsubscribe from its input's
+    // events.
+    updateTransformers("app", [[]]);
+    buildShouldSucceed();
+
+    // Update the input. With issue 19540, this would cause the removed phase to
+    // try to update its status, which would crash.
+    updateSources(["app|foo.txt"]);
+    buildShouldSucceed();
+  });
+}