Install barback from a hosted source in all tests.

test/transformer/prefers_transformer_to_library_name_test.dart

Index: test/transformer/prefers_transformer_to_library_name_test.dart
diff --git a/test/transformer/prefers_transformer_to_library_name_test.dart b/test/transformer/prefers_transformer_to_library_name_test.dart
index cbedf6917e3918f10e5e51ee51c4451cf074b5ae..4e3d76782d0fe5e757245114fa8b59ed79eca9c2 100644
--- a/test/transformer/prefers_transformer_to_library_name_test.dart
+++ b/test/transformer/prefers_transformer_to_library_name_test.dart
@@ -28,26 +28,28 @@ class RewriteTransformer extends Transformer {
 """;
 
 main() {
-  integration("prefers transformer.dart to <package name>.dart", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": ["myapp"]
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", REWRITE_TRANSFORMER),
-        d.file("myapp.dart", WRONG_TRANSFORMER)
-      ]),
-      d.dir("web", [
-        d.file("foo.txt", "foo")
-      ])
-    ]).create();
-
-    createLockFile('myapp', pkg: ['barback']);
-
-    pubServe();
-    requestShouldSucceed("foo.out", "foo.out");
-    requestShould404("foo.wrong");
-    endPubServe();
-  });
+   integration("prefers transformer.dart to <package name>.dart", () {
+     serveBarback();
+
+     d.dir(appPath, [
+       d.pubspec({
+         "name": "myapp",
+         "transformers": ["myapp"],
+         "dependencies": {"barback": "any"}
+       }),
+       d.dir("lib", [
+         d.file("transformer.dart", REWRITE_TRANSFORMER),
+         d.file("myapp.dart", WRONG_TRANSFORMER)
+       ]),
+       d.dir("web", [
+         d.file("foo.txt", "foo")
+       ])
+     ]).create();
+
+     pubGet();
+     pubServe();
+     requestShouldSucceed("foo.out", "foo.out");
+     requestShould404("foo.wrong");
+     endPubServe();
+   });
 }