Run pub tests against older versions of barback.

sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart

Index: sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart
diff --git a/sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart b/sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart
index 0dd5c17283971173503ac8b09aa9dfbc52d880ca..2c278c521a143ef57fc2d9f5bcf0414891532a63 100644
--- a/sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart
+++ b/sdk/lib/_internal/pub/test/dart2js/output_can_be_consumed_by_successive_phases.dart
@@ -28,22 +28,24 @@ class RewriteTransformer extends Transformer {
 
 main() {
   initConfig();
-  integration("output can be consumed by successive phases", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": ["\$dart2js", "myapp/src/transformer"]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", JS_REWRITE_TRANSFORMER)
-      ])]),
-      d.dir("web", [d.file("main.dart", "void main() {}")])
-    ]).create();
-
-    createLockFile('myapp', pkg: ['barback']);
-
-    pubServe();
-    requestShouldSucceed("main.dart.out", isUnminifiedDart2JSOutput);
-    endPubServe();
+  withBarbackVersions("any", () {
+    integration("output can be consumed by successive phases", () {
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "transformers": ["\$dart2js", "myapp/src/transformer"]
+        }),
+        d.dir("lib", [d.dir("src", [
+          d.file("transformer.dart", JS_REWRITE_TRANSFORMER)
+        ])]),
+        d.dir("web", [d.file("main.dart", "void main() {}")])
+      ]).create();
+
+      createLockFile('myapp', pkg: ['barback']);
+
+      pubServe();
+      requestShouldSucceed("main.dart.out", isUnminifiedDart2JSOutput);
+      endPubServe();
+    });
   });
 }