Run pub tests against older versions of barback.

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

Index: sdk/lib/_internal/pub/test/dart2js/compiles_generated_file_from_dependency_outside_web_test.dart
diff --git a/sdk/lib/_internal/pub/test/dart2js/compiles_generated_file_from_dependency_outside_web_test.dart b/sdk/lib/_internal/pub/test/dart2js/compiles_generated_file_from_dependency_outside_web_test.dart
index e66023ddb714b879c9316309c0aecf8bc9c7a972..d64b53382427f099822ea8f75191b09fe06bc349 100644
--- a/sdk/lib/_internal/pub/test/dart2js/compiles_generated_file_from_dependency_outside_web_test.dart
+++ b/sdk/lib/_internal/pub/test/dart2js/compiles_generated_file_from_dependency_outside_web_test.dart
@@ -11,34 +11,36 @@ import '../serve/utils.dart';
 main() {
   // This is a regression test for issue #17198.
   initConfig();
-  integration("compiles a Dart file that imports a generated file to JS "
-      "outside web/", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "version": "0.0.1",
-        "transformers": ["myapp/transformer"]
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer("munge"))
-      ]),
-      d.dir("test", [
-        d.file("main.dart", """
+  withBarbackVersions("any", () {
+    integration("compiles a Dart file that imports a generated file to JS "
+        "outside web/", () {
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "version": "0.0.1",
+          "transformers": ["myapp/transformer"]
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer("munge"))
+        ]),
+        d.dir("test", [
+          d.file("main.dart", """
 import "other.dart";
 void main() => print(TOKEN);
 """),
-        d.file("other.dart", """
+          d.file("other.dart", """
 library other;
 const TOKEN = "before";
 """)
-      ])
-    ]).create();
+        ])
+      ]).create();
 
-    createLockFile('myapp', pkg: ['barback']);
+      createLockFile('myapp', pkg: ['barback']);
 
-    pubServe(args: ["test"]);
-    requestShouldSucceed("main.dart.js", contains("(before, munge)"),
-        root: "test");
-    endPubServe();
+      pubServe(args: ["test"]);
+      requestShouldSucceed("main.dart.js", contains("(before, munge)"),
+          root: "test");
+      endPubServe();
+    });
   });
 }