Run pub tests against older versions of barback.

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

Index: sdk/lib/_internal/pub/test/transformer/runs_one_third_party_transformer_on_another_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/runs_one_third_party_transformer_on_another_test.dart b/sdk/lib/_internal/pub/test/transformer/runs_one_third_party_transformer_on_another_test.dart
index 8ba5497556d383f23643b6db041a08953529b94a..079e3776d7ee12991371df5e360aff39e4500492 100644
--- a/sdk/lib/_internal/pub/test/transformer/runs_one_third_party_transformer_on_another_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/runs_one_third_party_transformer_on_another_test.dart
@@ -10,45 +10,47 @@ import '../serve/utils.dart';
 
 main() {
   initConfig();
-  integration("runs one third-party transformer on another", () {
-    d.dir("foo", [
-      d.pubspec({
-        "name": "foo",
-        "version": "1.0.0"
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer('foo')),
-      ])
-    ]).create();
+  withBarbackVersions("any", () {
+    integration("runs one third-party transformer on another", () {
+      d.dir("foo", [
+        d.pubspec({
+          "name": "foo",
+          "version": "1.0.0"
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer('foo')),
+        ])
+      ]).create();
 
-    d.dir("bar", [
-      d.pubspec({
-        "name": "bar",
-        "version": "1.0.0",
-        "transformers": ["foo/transformer"],
-        "dependencies": {"foo": {"path": "../foo"}}
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer('bar')),
-      ])
-    ]).create();
+      d.dir("bar", [
+        d.pubspec({
+          "name": "bar",
+          "version": "1.0.0",
+          "transformers": ["foo/transformer"],
+          "dependencies": {"foo": {"path": "../foo"}}
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer('bar')),
+        ])
+      ]).create();
 
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": ["bar/transformer"],
-        "dependencies": {'bar': {'path': '../bar'}}
-      }),
-      d.dir("web", [
-        d.file("main.dart", 'const TOKEN = "main.dart";')
-      ])
-    ]).create();
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "transformers": ["bar/transformer"],
+          "dependencies": {'bar': {'path': '../bar'}}
+        }),
+        d.dir("web", [
+          d.file("main.dart", 'const TOKEN = "main.dart";')
+        ])
+      ]).create();
 
-    createLockFile('myapp', sandbox: ['foo', 'bar'], pkg: ['barback']);
+      createLockFile('myapp', sandbox: ['foo', 'bar'], pkg: ['barback']);
 
-    pubServe();
-    requestShouldSucceed("main.dart",
-        'const TOKEN = "(main.dart, (bar, foo))";');
-    endPubServe();
+      pubServe();
+      requestShouldSucceed("main.dart",
+          'const TOKEN = "(main.dart, (bar, foo))";');
+      endPubServe();
+    });
   });
 }