Run pub tests against older versions of barback.

sdk/lib/_internal/pub/test/transformer/runs_a_local_transform_on_the_application_package_test.dart

Index: sdk/lib/_internal/pub/test/transformer/runs_a_local_transform_on_the_application_package_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/runs_a_local_transform_on_the_application_package_test.dart b/sdk/lib/_internal/pub/test/transformer/runs_a_local_transform_on_the_application_package_test.dart
index a9e3e8f1beb822d476477c885ea3981a4f3b4679..6412284d146d04346ca2300fb276040f61b78911 100644
--- a/sdk/lib/_internal/pub/test/transformer/runs_a_local_transform_on_the_application_package_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/runs_a_local_transform_on_the_application_package_test.dart
@@ -10,24 +10,26 @@ import '../serve/utils.dart';
 
 main() {
   initConfig();
-  integration("runs a local transform on the application package", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": ["myapp/src/transformer"]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", REWRITE_TRANSFORMER)
-      ])]),
-      d.dir("web", [
-        d.file("foo.txt", "foo")
-      ])
-    ]).create();
+  withBarbackVersions("any", () {
+    integration("runs a local transform on the application package", () {
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "transformers": ["myapp/src/transformer"]
+        }),
+        d.dir("lib", [d.dir("src", [
+          d.file("transformer.dart", REWRITE_TRANSFORMER)
+        ])]),
+        d.dir("web", [
+          d.file("foo.txt", "foo")
+        ])
+      ]).create();
 
-    createLockFile('myapp', pkg: ['barback']);
+      createLockFile('myapp', pkg: ['barback']);
 
-    pubServe();
-    requestShouldSucceed("foo.out", "foo.out");
-    endPubServe();
+      pubServe();
+      requestShouldSucceed("foo.out", "foo.out");
+      endPubServe();
+    });
   });
 }