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

Index: packages/barback/test/package_graph/transform/aggregate_test.dart
diff --git a/packages/barback/test/package_graph/transform/aggregate_test.dart b/packages/barback/test/package_graph/transform/aggregate_test.dart
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index 0000000000000000000000000000000000000000..d6fb050d8cb739a9bc3f385bf46886fd54120b5d
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+++ b/packages/barback/test/package_graph/transform/aggregate_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.
+
+library barback.test.package_graph.transform.aggregate_test;
+
+import 'package:barback/src/utils.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../utils.dart';
+
+main() {
+  initConfig();
+  test("an aggregate transformer can read from multiple primary inputs", () {
+    var sources = [
+      "app|dir/foo.txt",
+      "app|dir/bar.txt",
+      "app|dir/baz.jpg",
+      "app|dir/subdir/bang.txt",
+      "app|dir/subdir/qux.txt",
+      "app|dir/subdir/zap.png"
+    ];
+
+    initGraph(sources, {"app": [
+      [new AggregateManyToOneTransformer("txt", "out.txt")]
+    ]});
+
+    updateSources(sources);
+    expectAsset("app|dir/out.txt", "bar\nfoo");
+    expectAsset("app|dir/subdir/out.txt", "bang\nqux");
+    buildShouldSucceed();
+  });
+
+  test("an aggregate transformer isn't run if there are no primary inputs", () {
+    var transformer = new AggregateManyToOneTransformer("txt", "out.txt");
+    initGraph(["app|foo.zip", "app|bar.zap"], {"app": [
+      [transformer]
+    ]});
+
+    updateSources(["app|foo.zip", "app|bar.zap"]);
+    expectNoAsset("app|out.txt");
+    buildShouldSucceed();
+
+    expect(transformer.numRuns, completion(equals(0)));
+  });
+
+  test("an aggregate transformer is re-run if a primary input changes", () {
+    initGraph(["app|foo.txt", "app|bar.txt"], {"app": [
+      [new AggregateManyToOneTransformer("txt", "out.txt")]
+    ]});
+
+    updateSources(["app|foo.txt", "app|bar.txt"]);
+    expectAsset("app|out.txt", "bar\nfoo");
+    buildShouldSucceed();
+
+    modifyAsset("app|foo.txt", "new foo");
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|out.txt", "bar\nnew foo");
+    buildShouldSucceed();
+  });
+
+  test("an aggregate transformer is re-run if a primary input is removed", () {
+    initGraph(["app|foo.txt", "app|bar.txt"], {"app": [
+      [new AggregateManyToOneTransformer("txt", "out.txt")]
+    ]});
+
+    updateSources(["app|foo.txt", "app|bar.txt"]);
+    expectAsset("app|out.txt", "bar\nfoo");
+    buildShouldSucceed();
+
+    removeSources(["app|foo.txt"]);
+    expectAsset("app|out.txt", "bar");
+    buildShouldSucceed();
+  });
+
+  test("an aggregate transformer is re-run if a primary input is added", () {
+    initGraph(["app|foo.txt", "app|bar.txt", "app|baz.txt"], {"app": [
+      [new AggregateManyToOneTransformer("txt", "out.txt")]
+    ]});
+
+    updateSources(["app|foo.txt", "app|bar.txt"]);
+    expectAsset("app|out.txt", "bar\nfoo");
+    buildShouldSucceed();
+
+    updateSources(["app|baz.txt"]);
+    expectAsset("app|out.txt", "bar\nbaz\nfoo");
+    buildShouldSucceed();
+  });
+
+  test("an aggregate transformer ceases to run if all primary inputs are "
+      "removed", () {
+    initGraph(["app|foo.txt", "app|bar.txt"], {"app": [
+      [new AggregateManyToOneTransformer("txt", "out.txt")]
+    ]});
+
+    updateSources(["app|foo.txt", "app|bar.txt"]);
+    expectAsset("app|out.txt", "bar\nfoo");
+    buildShouldSucceed();
+
+    removeSources(["app|foo.txt", "app|bar.txt"]);
+    expectNoAsset("app|out.txt");
+    buildShouldSucceed();
+  });
+
+  test("an aggregate transformer starts to run if new primary inputs are "
+      "added", () {
+    initGraph(["app|foo.txt", "app|bar.txt"], {"app": [
+      [new AggregateManyToOneTransformer("txt", "out.txt")]
+    ]});
+
+    updateSources([]);
+    expectNoAsset("app|out.txt");
+    buildShouldSucceed();
+
+    updateSources(["app|foo.txt", "app|bar.txt"]);
+    expectAsset("app|out.txt", "bar\nfoo");
+    buildShouldSucceed();
+  });
+
+  group("pass-through", () {
+    test("an aggregate transformer passes through its primary inputs by "
+        "default", () {
+      initGraph(["app|foo.txt", "app|bar.txt"], {"app": [
+        [new AggregateManyToOneTransformer("txt", "out.txt")]
+      ]});
+
+      updateSources(["app|foo.txt", "app|bar.txt"]);
+      expectAsset("app|foo.txt", "foo");
+      expectAsset("app|bar.txt", "bar");
+      buildShouldSucceed();
+
+      modifyAsset("app|foo.txt", "new foo");
+      updateSources(["app|foo.txt"]);
+      expectAsset("app|foo.txt", "new foo");
+      buildShouldSucceed();
+    });
+
+    test("an aggregate transformer can overwrite its primary inputs", () {
+      initGraph(["app|foo.txt", "app|bar.txt"], {"app": [
+        [new AggregateManyToManyTransformer("txt")]
+      ]});
+
+      updateSources(["app|foo.txt", "app|bar.txt"]);
+      expectAsset("app|foo.txt", "modified foo");
+      expectAsset("app|bar.txt", "modified bar");
+      buildShouldSucceed();
+    });
+
+    test("an aggregate transformer can consume its primary inputs", () {
+      var transformer = new AggregateManyToOneTransformer("txt", "out.txt");
+      transformer.consumePrimaries
+          ..add("app|foo.txt")
+          ..add("app|bar.txt");
+
+      initGraph(["app|foo.txt", "app|bar.txt"], {"app": [[transformer]]});
+
+      updateSources(["app|foo.txt", "app|bar.txt"]);
+      expectNoAsset("app|foo.txt");
+      expectNoAsset("app|bar.txt");
+      buildShouldSucceed();
+    });
+
+    test("an aggregate transformer passes through non-primary inputs", () {
+      initGraph(["app|foo.jpg", "app|bar.png"], {"app": [
+        [new AggregateManyToManyTransformer("txt")]
+      ]});
+
+      updateSources(["app|foo.jpg", "app|bar.png"]);
+      expectAsset("app|foo.jpg", "foo");
+      expectAsset("app|bar.png", "bar");
+      buildShouldSucceed();
+
+      modifyAsset("app|foo.jpg", "new foo");
+      updateSources(["app|foo.jpg"]);
+      expectAsset("app|foo.jpg", "new foo");
+      buildShouldSucceed();
+    });
+  });
+
+  group("apply() transform stream", () {
+    test("the primary input stream doesn't close if a previous phase is still "
+        "running", () {
+      var rewrite = new RewriteTransformer("a", "b");
+      initGraph(["app|foo.txt", "app|bar.a"], {"app": [
+        [rewrite],
+        [new AggregateManyToOneTransformer("txt", "out.txt")]
+      ]});
+
+      rewrite.pauseApply();
+      updateSources(["app|foo.txt", "app|bar.a"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      rewrite.resumeApply();
+      expectAsset("app|out.txt", "foo");
+      buildShouldSucceed();
+    });
+
+    test("the primary input stream doesn't close if a previous phase is "
+        "materializing a primary input", () {
+      var rewrite = new DeclaringRewriteTransformer("in", "txt");
+      initGraph(["app|foo.txt", "app|bar.in"], {"app": [
+        [rewrite],
+        [new AggregateManyToOneTransformer("txt", "out.txt")]
+      ]});
+
+      rewrite.pauseApply();
+      updateSources(["app|foo.txt", "app|bar.in"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      rewrite.resumeApply();
+      expectAsset("app|out.txt", "bar.txt\nfoo");
+      buildShouldSucceed();
+    });
+
+    test("the primary input stream closes if a previous phase is only "
+        "materializing non-primary inputs", () {
+      var rewrite = new DeclaringRewriteTransformer("a", "b");
+      initGraph(["app|foo.txt", "app|bar.a"], {"app": [
+        [rewrite],
+        [new AggregateManyToOneTransformer("txt", "out.txt")]
+      ]});
+
+      rewrite.pauseApply();
+      updateSources(["app|foo.txt", "app|bar.a"]);
+      expectAsset("app|out.txt", "foo");
+
+      rewrite.resumeApply();
+      buildShouldSucceed();
+    });
+
+    test("a new primary input that arrives before the stream closes doesn't "
+        "cause apply to restart", () {
+      var rewrite = new RewriteTransformer("a", "b");
+      var aggregate = new AggregateManyToOneTransformer("txt", "out.txt");
+      initGraph(["app|foo.txt", "app|bar.txt", "app|baz.a"], {"app": [
+        [rewrite],
+        [aggregate]
+      ]});
+
+      // The stream won't close until [rewrite] finishes running `apply()`.
+      rewrite.pauseApply();
+
+      updateSources(["app|foo.txt", "app|baz.a"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      updateSources(["app|bar.txt"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      rewrite.resumeApply();
+      expectAsset("app|out.txt", "bar\nfoo");
+      buildShouldSucceed();
+
+      expect(aggregate.numRuns, completion(equals(1)));
+    });
+
+    test("a new primary input that arrives after the stream closes causes "
+        "apply to restart", () {
+      var aggregate = new AggregateManyToOneTransformer("txt", "out.txt");
+      initGraph(["app|foo.txt", "app|bar.txt"], {"app": [[aggregate]]});
+
+      aggregate.pauseApply();
+      updateSources(["app|foo.txt"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      updateSources(["app|bar.txt"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      aggregate.resumeApply();
+      expectAsset("app|out.txt", "bar\nfoo");
+      buildShouldSucceed();
+
+      expect(aggregate.numRuns, completion(equals(2)));
+    });
+
+    test("a primary input that's modified before the stream closes causes "
+        "apply to restart", () {
+      var rewrite = new RewriteTransformer("a", "b");
+      var aggregate = new AggregateManyToOneTransformer("txt", "out.txt");
+      initGraph(["app|foo.txt", "app|bar.a"], {"app": [
+        [rewrite],
+        [aggregate]
+      ]});
+
+      // The stream won't close until [rewrite] finishes running `apply()`.
+      rewrite.pauseApply();
+
+      updateSources(["app|foo.txt", "app|bar.a"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      modifyAsset("app|foo.txt", "new foo");
+      updateSources(["app|foo.txt"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      rewrite.resumeApply();
+      expectAsset("app|out.txt", "new foo");
+      buildShouldSucceed();
+
+      expect(aggregate.numRuns, completion(equals(2)));
+    });
+
+    test("a primary input that's removed before the stream closes causes apply "
+        "to restart", () {
+      var rewrite = new RewriteTransformer("a", "b");
+      var aggregate = new AggregateManyToOneTransformer("txt", "out.txt");
+      initGraph(["app|foo.txt", "app|bar.txt", "app|baz.a"], {"app": [
+        [rewrite],
+        [aggregate]
+      ]});
+
+      // The stream won't close until [rewrite] finishes running `apply()`.
+      rewrite.pauseApply();
+
+      updateSources(["app|foo.txt", "app|bar.txt", "app|baz.a"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      removeSources(["app|bar.txt"]);
+      expectAssetDoesNotComplete("app|out.txt");
+
+      rewrite.resumeApply();
+      expectAsset("app|out.txt", "foo");
+      buildShouldSucceed();
+
+      expect(aggregate.numRuns, completion(equals(2)));
+    });
+  });
+}