Run pub tests against older versions of barback.

third_party/pkg/barback-0.13.0/test/package_graph/transform/concurrency_test.dart

Index: third_party/pkg/barback-0.13.0/test/package_graph/transform/concurrency_test.dart
diff --git a/pkg/barback/test/package_graph/transform/concurrency_test.dart b/third_party/pkg/barback-0.13.0/test/package_graph/transform/concurrency_test.dart
similarity index 91%
copy from pkg/barback/test/package_graph/transform/concurrency_test.dart
copy to third_party/pkg/barback-0.13.0/test/package_graph/transform/concurrency_test.dart
index 5b0d2e9709beabf82686353bc5f67a0698568187..41e3047a5c9e55d6d08b61c5890d00dd918a2927 100644
--- a/pkg/barback/test/package_graph/transform/concurrency_test.dart
+++ b/third_party/pkg/barback-0.13.0/test/package_graph/transform/concurrency_test.dart
@@ -490,53 +490,4 @@ main() {
     expectAsset("app|bar.out", "foo.in");
     buildShouldSucceed();
   });
-
-  test("materializes a passed-through asset that was emitted before it was "
-      "available", () {
-    initGraph(["app|foo.in"], {"app": [
-      [new RewriteTransformer("txt", "txt")]
-    ]});
-
-    pauseProvider();
-    updateSources(["app|foo.in"]);
-    expectAssetDoesNotComplete("app|foo.in");
-
-    resumeProvider();
-    expectAsset("app|foo.in", "foo");
-    buildShouldSucceed();
-  });
-
-  test("re-runs if the primary input is invalidated before accessing", () {
-    var transformer1 = new RewriteTransformer("txt", "mid");
-    var transformer2 = new RewriteTransformer("mid", "out");
-
-    initGraph([
-      "app|foo.txt"
-    ], {"app": [
-      [transformer1],
-      [transformer2]
-    ]});
-
-    transformer2.pausePrimaryInput();
-    updateSources(["app|foo.txt"]);
-
-    // Wait long enough to ensure that transformer1 has completed and
-    // transformer2 has started.
-    schedule(pumpEventQueue);
-
-    // Update the source again so that transformer1 invalidates the primary
-    // input of transformer2.
-    transformer1.pauseApply();
-    modifyAsset("app|foo.txt", "new foo");
-    updateSources(["app|foo.txt"]);
-
-    transformer2.resumePrimaryInput();
-    transformer1.resumeApply();
-
-    expectAsset("app|foo.out", "new foo.mid.out");
-    buildShouldSucceed();
-
-    expect(transformer1.numRuns, completion(equals(2)));
-    expect(transformer2.numRuns, completion(equals(2)));
-  });
 }