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

Index: packages/barback/test/package_graph/transform/transform_test.dart
diff --git a/packages/barback/test/package_graph/transform/transform_test.dart b/packages/barback/test/package_graph/transform/transform_test.dart
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+// 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.
+
+// This library contains tests for transformer behavior that relates to actions
+// happening concurrently or other complex asynchronous timing behavior.
+library barback.test.package_graph.transform.transform_test;
+
+import 'package:barback/src/utils.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../utils.dart';
+
+main() {
+  initConfig();
+  test("gets a transformed asset with a different path", () {
+    initGraph(["app|foo.blub"], {"app": [
+      [new RewriteTransformer("blub", "blab")]
+    ]});
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+  });
+
+  test("gets a transformed asset with the same path", () {
+    initGraph(["app|foo.blub"], {"app": [
+      [new RewriteTransformer("blub", "blub")]
+    ]});
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blub", "foo.blub");
+    buildShouldSucceed();
+  });
+
+  test("doesn't find an output from a later phase", () {
+    initGraph(["app|foo.a"], {"app": [
+      [new RewriteTransformer("b", "c")],
+      [new RewriteTransformer("a", "b")]
+    ]});
+    updateSources(["app|foo.a"]);
+    expectNoAsset("app|foo.c");
+    buildShouldSucceed();
+  });
+
+  test("doesn't find an output from the same phase", () {
+    initGraph(["app|foo.a"], {"app": [
+      [
+        new RewriteTransformer("a", "b"),
+        new RewriteTransformer("b", "c")
+      ]
+    ]});
+    updateSources(["app|foo.a"]);
+    expectAsset("app|foo.b", "foo.b");
+    expectNoAsset("app|foo.c");
+    buildShouldSucceed();
+  });
+
+  test("finds the latest output before the transformer's phase", () {
+    initGraph(["app|foo.blub"], {"app": [
+      [new RewriteTransformer("blub", "blub")],
+      [
+        new RewriteTransformer("blub", "blub"),
+        new RewriteTransformer("blub", "done")
+      ],
+      [new RewriteTransformer("blub", "blub")]
+    ]});
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.done", "foo.blub.done");
+    buildShouldSucceed();
+  });
+
+  test("applies multiple transformations to an asset", () {
+    initGraph(["app|foo.a"], {"app": [
+      [new RewriteTransformer("a", "b")],
+      [new RewriteTransformer("b", "c")],
+      [new RewriteTransformer("c", "d")],
+      [new RewriteTransformer("d", "e")],
+      [new RewriteTransformer("e", "f")],
+      [new RewriteTransformer("f", "g")],
+      [new RewriteTransformer("g", "h")],
+      [new RewriteTransformer("h", "i")],
+      [new RewriteTransformer("i", "j")],
+      [new RewriteTransformer("j", "k")],
+    ]});
+    updateSources(["app|foo.a"]);
+    expectAsset("app|foo.k", "foo.b.c.d.e.f.g.h.i.j.k");
+    buildShouldSucceed();
+  });
+
+  test("only runs a transform once for all of its outputs", () {
+    var transformer = new RewriteTransformer("blub", "a b c");
+    initGraph(["app|foo.blub"], {"app": [[transformer]]});
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.a", "foo.a");
+    expectAsset("app|foo.b", "foo.b");
+    expectAsset("app|foo.c", "foo.c");
+    buildShouldSucceed();
+    expect(transformer.numRuns, completion(equals(1)));
+  });
+
+  test("outputs are passed through transformers by default", () {
+    initGraph(["app|foo.a"], {"app": [
+      [new RewriteTransformer("a", "b")],
+      [new RewriteTransformer("a", "c")]
+    ]});
+    updateSources(["app|foo.a"]);
+    expectAsset("app|foo.a", "foo");
+    expectAsset("app|foo.b", "foo.b");
+    expectAsset("app|foo.c", "foo.c");
+    buildShouldSucceed();
+  });
+
+  test("does not reapply transform when inputs are not modified", () {
+    var transformer = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.blub"], {"app": [[transformer]]});
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    expectAsset("app|foo.blab", "foo.blab");
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    expect(transformer.numRuns, completion(equals(1)));
+  });
+
+  test("reapplies a transform when its input is modified", () {
+    var transformer = new RewriteTransformer("blub", "blab");
+    initGraph(["app|foo.blub"], {"app": [[transformer]]});
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "foo.blab");
+    buildShouldSucceed();
+
+    expect(transformer.numRuns, completion(equals(3)));
+  });
+
+  test("does not reapply transform when a removed input is modified", () {
+    var transformer = new ManyToOneTransformer("txt");
+    initGraph({
+      "app|a.txt": "a.inc,b.inc",
+      "app|a.inc": "a",
+      "app|b.inc": "b"
+    }, {"app": [[transformer]]});
+
+    updateSources(["app|a.txt", "app|a.inc", "app|b.inc"]);
+
+    expectAsset("app|a.out", "ab");
+    buildShouldSucceed();
+
+    // Remove the dependency on the non-primary input.
+    modifyAsset("app|a.txt", "a.inc");
+    updateSources(["app|a.txt"]);
+
+    // Process it again.
+    expectAsset("app|a.out", "a");
+    buildShouldSucceed();
+
+    // Now touch the removed input. It should not trigger another build.
+    updateSources(["app|b.inc"]);
+    expectAsset("app|a.out", "a");
+    buildShouldSucceed();
+
+    expect(transformer.numRuns, completion(equals(2)));
+  });
+
+  test("allows a transform to generate multiple outputs", () {
+    initGraph({"app|foo.txt": "a.out,b.out"}, {"app": [
+      [new OneToManyTransformer("txt")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+
+    expectAsset("app|a.out", "spread txt");
+    expectAsset("app|b.out", "spread txt");
+    buildShouldSucceed();
+  });
+
+  test("does not rebuild transforms that don't use modified source", () {
+    var a = new RewriteTransformer("a", "aa");
+    var aa = new RewriteTransformer("aa", "aaa");
+    var b = new RewriteTransformer("b", "bb");
+    var bb = new RewriteTransformer("bb", "bbb");
+    initGraph(["app|foo.a", "app|foo.b"], {"app": [
+      [a, b],
+      [aa, bb],
+    ]});
+
+    updateSources(["app|foo.a"]);
+    updateSources(["app|foo.b"]);
+
+    expectAsset("app|foo.aaa", "foo.aa.aaa");
+    expectAsset("app|foo.bbb", "foo.bb.bbb");
+    buildShouldSucceed();
+
+    updateSources(["app|foo.a"]);
+    expectAsset("app|foo.aaa", "foo.aa.aaa");
+    expectAsset("app|foo.bbb", "foo.bb.bbb");
+    buildShouldSucceed();
+
+    expect(aa.numRuns, completion(equals(2)));
+    expect(bb.numRuns, completion(equals(1)));
+  });
+
+  test("doesn't get an output from a transform whose primary input is removed",
+      () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new RewriteTransformer("txt", "out")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.out");
+    buildShouldSucceed();
+
+    removeSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.out");
+    buildShouldSucceed();
+  });
+
+  test("reapplies a transform when a non-primary input changes", () {
+    initGraph({
+      "app|a.txt": "a.inc",
+      "app|a.inc": "a"
+    }, {"app": [[new ManyToOneTransformer("txt")]]});
+
+    updateSources(["app|a.txt", "app|a.inc"]);
+    expectAsset("app|a.out", "a");
+    buildShouldSucceed();
+
+    modifyAsset("app|a.inc", "after");
+    updateSources(["app|a.inc"]);
+
+    expectAsset("app|a.out", "after");
+    buildShouldSucceed();
+  });
+
+  test("applies a transform when it becomes newly primary", () {
+    initGraph({
+      "app|foo.txt": "this",
+    }, {"app": [[new CheckContentTransformer("that", " and the other")]]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.txt", "this");
+    buildShouldSucceed();
+
+    modifyAsset("app|foo.txt", "that");
+    updateSources(["app|foo.txt"]);
+
+    expectAsset("app|foo.txt", "that and the other");
+    buildShouldSucceed();
+  });
+
+  test("handles an output moving from one transformer to another", () {
+    // In the first run, "shared.out" is created by the "a.a" transformer.
+    initGraph({
+      "app|a.a": "a.out,shared.out",
+      "app|b.b": "b.out"
+    }, {"app": [
+      [new OneToManyTransformer("a"), new OneToManyTransformer("b")]
+    ]});
+
+    updateSources(["app|a.a", "app|b.b"]);
+
+    expectAsset("app|a.out", "spread a");
+    expectAsset("app|b.out", "spread b");
+    expectAsset("app|shared.out", "spread a");
+    buildShouldSucceed();
+
+    // Now switch their contents so that "shared.out" will be output by "b.b"'s
+    // transformer.
+    modifyAsset("app|a.a", "a.out");
+    modifyAsset("app|b.b", "b.out,shared.out");
+    updateSources(["app|a.a", "app|b.b"]);
+
+    expectAsset("app|a.out", "spread a");
+    expectAsset("app|b.out", "spread b");
+    expectAsset("app|shared.out", "spread b");
+    buildShouldSucceed();
+  });
+
+  test("applies transforms to the correct packages", () {
+    var rewrite1 = new RewriteTransformer("txt", "out1");
+    var rewrite2 = new RewriteTransformer("txt", "out2");
+    initGraph([
+      "pkg1|foo.txt",
+      "pkg2|foo.txt"
+    ], {"pkg1": [[rewrite1]], "pkg2": [[rewrite2]]});
+
+    updateSources(["pkg1|foo.txt", "pkg2|foo.txt"]);
+    expectAsset("pkg1|foo.out1", "foo.out1");
+    expectAsset("pkg2|foo.out2", "foo.out2");
+    buildShouldSucceed();
+  });
+
+  test("transforms don't see generated assets in other packages", () {
+    var fooToBar = new RewriteTransformer("foo", "bar");
+    var barToBaz = new RewriteTransformer("bar", "baz");
+    initGraph(["pkg1|file.foo"], {"pkg1": [[fooToBar]], "pkg2": [[barToBaz]]});
+
+    updateSources(["pkg1|file.foo"]);
+    expectAsset("pkg1|file.bar", "file.bar");
+    expectNoAsset("pkg2|file.baz");
+    buildShouldSucceed();
+  });
+
+  test("removes pipelined transforms when the root primary input is removed",
+      () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new RewriteTransformer("txt", "mid")],
+      [new RewriteTransformer("mid", "out")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.mid.out");
+    buildShouldSucceed();
+
+    removeSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.out");
+    buildShouldSucceed();
+  });
+
+  test("removes pipelined transforms when the parent ceases to generate the "
+      "primary input", () {
+    initGraph({"app|foo.txt": "foo.mid"}, {'app': [
+      [new OneToManyTransformer('txt')],
+      [new RewriteTransformer('mid', 'out')]
+    ]});
+
+    updateSources(['app|foo.txt']);
+    expectAsset('app|foo.out', 'spread txt.out');
+    buildShouldSucceed();
+
+    modifyAsset("app|foo.txt", "bar.mid");
+    updateSources(["app|foo.txt"]);
+    expectNoAsset('app|foo.out');
+    expectAsset('app|bar.out', 'spread txt.out');
+    buildShouldSucceed();
+  });
+
+  test("gets an asset transformed by a sync transformer", () {
+    initGraph(["app|foo.blub"], {"app": [
+      [new SyncRewriteTransformer("blub", "blab")]
+    ]});
+    updateSources(["app|foo.blub"]);
+    expectAsset("app|foo.blab", "new.blab");
+    buildShouldSucceed();
+  });
+
+  group("Transform.hasInput", () {
+    test("returns whether an input exists", () {
+      initGraph(["app|foo.txt", "app|bar.txt"], {'app': [
+        [new HasInputTransformer(['app|foo.txt', 'app|bar.txt', 'app|baz.txt'])]
+      ]});
+
+      updateSources(['app|foo.txt', 'app|bar.txt']);
+      expectAsset('app|foo.txt',
+          'app|foo.txt: true, app|bar.txt: true, app|baz.txt: false');
+      buildShouldSucceed();
+    });
+
+    test("re-runs the transformer when an input stops existing", () {
+      initGraph(["app|foo.txt", "app|bar.txt"], {'app': [
+        [new HasInputTransformer(['app|bar.txt'])]
+      ]});
+
+      updateSources(['app|foo.txt', 'app|bar.txt']);
+      expectAsset('app|foo.txt', 'app|bar.txt: true');
+      buildShouldSucceed();
+
+      removeSources(['app|bar.txt']);
+      expectAsset('app|foo.txt', 'app|bar.txt: false');
+      buildShouldSucceed();
+    });
+
+    test("re-runs the transformer when an input starts existing", () {
+      initGraph(["app|foo.txt", "app|bar.txt"], {'app': [
+        [new HasInputTransformer(['app|bar.txt'])]
+      ]});
+    
+      updateSources(['app|foo.txt']);
+      expectAsset('app|foo.txt', 'app|bar.txt: false');
+      buildShouldSucceed();
+    
+      updateSources(['app|bar.txt']);
+      expectAsset('app|foo.txt', 'app|bar.txt: true');
+      buildShouldSucceed();
+    });
+
+    group("on an input in another package", () {
+      test("returns whether it exists", () {
+        initGraph(["app|foo.txt", "other|bar.txt"], {'app': [
+          [new HasInputTransformer(['other|bar.txt', 'other|baz.txt'])]
+        ]});
+
+        updateSources(['app|foo.txt', 'other|bar.txt']);
+        expectAsset('app|foo.txt',
+            'other|bar.txt: true, other|baz.txt: false');
+        buildShouldSucceed();
+      });
+
+      test("re-runs the transformer when it stops existing", () {
+        initGraph(["app|foo.txt", "other|bar.txt"], {'app': [
+          [new HasInputTransformer(['other|bar.txt'])]
+        ]});
+
+        updateSources(['app|foo.txt', 'other|bar.txt']);
+        expectAsset('app|foo.txt', 'other|bar.txt: true');
+        buildShouldSucceed();
+
+        removeSources(['other|bar.txt']);
+        expectAsset('app|foo.txt', 'other|bar.txt: false');
+        buildShouldSucceed();
+      });
+
+      test("re-runs the transformer when it starts existing", () {
+        initGraph(["app|foo.txt", "other|bar.txt"], {'app': [
+          [new HasInputTransformer(['other|bar.txt'])]
+        ]});
+      
+        updateSources(['app|foo.txt']);
+        expectAsset('app|foo.txt', 'other|bar.txt: false');
+        buildShouldSucceed();
+      
+        updateSources(['other|bar.txt']);
+        expectAsset('app|foo.txt', 'other|bar.txt: true');
+        buildShouldSucceed();
+      });
+    });
+  });
+}