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

Index: packages/barback/test/package_graph/transform/consume_input_test.dart
diff --git a/packages/barback/test/package_graph/transform/consume_input_test.dart b/packages/barback/test/package_graph/transform/consume_input_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2580f5d128e5e12a4d640777a52cb90577fbd461
--- /dev/null
+++ b/packages/barback/test/package_graph/transform/consume_input_test.dart
@@ -0,0 +1,170 @@
+// 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("a transform consumes its input without overwriting it", () {
+    initGraph([
+      "app|foo.txt"
+    ], {
+      "app": [[new RewriteTransformer("txt", "out")..consumePrimary = true]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.out");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a transform consumes its input while a sibling overwrites it", () {
+    initGraph([
+      "app|foo.txt"
+    ], {
+      "app": [[
+        new RewriteTransformer("txt", "out")..consumePrimary = true,
+        new RewriteTransformer("txt", "txt")
+      ]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.out");
+    expectAsset("app|foo.txt", "foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a transform stops consuming its input", () {
+    initGraph({
+      "app|foo.txt": "yes"
+    }, {
+      "app": [[
+        new ConditionallyConsumePrimaryTransformer("txt", "out", "yes")
+      ]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "yes.out");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+
+    modifyAsset("app|foo.txt", "no");
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "no.out");
+    expectAsset("app|foo.txt", "no");
+    buildShouldSucceed();
+  });
+
+  test("two sibling transforms both consume their input", () {
+    initGraph(["app|foo.txt"], {
+      "app": [[
+        new RewriteTransformer("txt", "one")..consumePrimary = true,
+        new RewriteTransformer("txt", "two")..consumePrimary = true
+      ]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.one", "foo.one");
+    expectAsset("app|foo.two", "foo.two");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a transform stops consuming its input but a sibling is still "
+      "consuming it", () {
+    initGraph({
+      "app|foo.txt": "yes"
+    }, {
+      "app": [[
+        new RewriteTransformer("txt", "one")..consumePrimary = true,
+        new ConditionallyConsumePrimaryTransformer("txt", "two", "yes")
+      ]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.one", "yes.one");
+    expectAsset("app|foo.two", "yes.two");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+
+    modifyAsset("app|foo.txt", "no");
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.one", "no.one");
+    expectAsset("app|foo.two", "no.two");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a transform consumes its input and emits nothing", () {
+    initGraph([
+      "app|foo.txt"
+    ], {
+      "app": [[new EmitNothingTransformer("txt")..consumePrimary = true]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a transform consumes its input, then is removed", () {
+    initGraph([
+      "app|foo.txt"
+    ], {
+      "app": [[new RewriteTransformer("txt", "out")..consumePrimary = true]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.out", "foo.out");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[]]);
+    expectNoAsset("app|foo.out");
+    expectAsset("app|foo.txt", "foo");
+    buildShouldSucceed();
+  });
+
+  test("a transform consumes its input and emits nothing, then is removed",
+      () {
+    initGraph([
+      "app|foo.txt"
+    ], {
+      "app": [[new EmitNothingTransformer("txt")..consumePrimary = true]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[]]);
+    expectAsset("app|foo.txt", "foo");
+    buildShouldSucceed();
+  });
+
+  test("a transform which consumes its input is added", () {
+    initGraph([
+      "app|foo.txt"
+    ], {
+      "app": [[]]
+    });
+
+    updateSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.out");
+    expectAsset("app|foo.txt", "foo");
+    buildShouldSucceed();
+
+    updateTransformers("app", [[
+      new RewriteTransformer("txt", "out")..consumePrimary = true
+    ]]);
+    expectAsset("app|foo.out", "foo.out");
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+}