Move isPrimary computation from PhaseInput into TransformNode.

pkg/barback/test/package_graph/lazy_transformer_test.dart

 // 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.lazy_asset_test;
 
 import 'package:barback/barback.dart';
 import 'package:barback/src/utils.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
@@ skipping 157 matching lines @@
   test("an error emitted in a lazy transformer's declareOuputs method prevents "
       "it from being materialized", () {
     var transformer = new LazyBadTransformer("app|foo.out");
     initGraph(["app|foo.txt"], {"app": [[transformer]]});
 
     updateSources(["app|foo.txt"]);
     expectNoAsset("app|foo.out");
     buildShouldFail([isTransformerException(equals(LazyBadTransformer.ERROR))]);
     expect(transformer.numRuns, completion(equals(0)));
   });
+
+  test("a lazy transformer passes through inputs it doesn't apply to", () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new LazyRewriteTransformer("blub", "blab")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a lazy transformer passes through inputs it doesn't overwrite", () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new LazyRewriteTransformer("txt", "out")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a lazy transformer doesn't pass through inputs it overwrites", () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new LazyRewriteTransformer("txt", "txt")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectAsset("app|foo.txt", "foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a lazy transformer doesn't pass through inputs it consumes", () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new LazyRewriteTransformer("txt", "out")..consumePrimary = true]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.txt");
+    buildShouldSucceed();
+  });
+
+  test("a lazy transformer that doesn't apply does nothing when forced", () {
+    initGraph(["app|foo.txt"], {"app": [
+      [new LazyRewriteTransformer("blub", "blab")]
+    ]});
+
+    updateSources(["app|foo.txt"]);
+    expectNoAsset("app|foo.blab");
+
+    // Getting all assets will force every lazy transformer. This shouldn't
+    // cause the rewrite to apply, because foo.txt isn't primary.
+    expectAllAssets(["app|foo.txt"]);
+    buildShouldSucceed();
+  });
 }