Run pub tests against older versions of barback.

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

Index: sdk/lib/_internal/pub/test/transformer/fails_to_load_an_unconfigurable_transformer_when_config_is_passed_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/fails_to_load_an_unconfigurable_transformer_when_config_is_passed_test.dart b/sdk/lib/_internal/pub/test/transformer/fails_to_load_an_unconfigurable_transformer_when_config_is_passed_test.dart
index 8033f5c6b682a8a91ff58915482fb4f27ecac148..9e18ce540aa71bc808e97c4f01ee121f8b2bdcec 100644
--- a/sdk/lib/_internal/pub/test/transformer/fails_to_load_an_unconfigurable_transformer_when_config_is_passed_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/fails_to_load_an_unconfigurable_transformer_when_config_is_passed_test.dart
@@ -13,23 +13,25 @@ import '../serve/utils.dart';
 main() {
   initConfig();
 
-  integration("fails to load an unconfigurable transformer when config is "
-      "passed", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": [{"myapp/src/transformer": {'foo': 'bar'}}]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", REWRITE_TRANSFORMER)
-      ])])
-    ]).create();
+  withBarbackVersions("any", () {
+     integration("fails to load an unconfigurable transformer when config is "
+         "passed", () {
+       d.dir(appPath, [
+         d.pubspec({
+           "name": "myapp",
+           "transformers": [{"myapp/src/transformer": {'foo': 'bar'}}]
+         }),
+         d.dir("lib", [d.dir("src", [
+           d.file("transformer.dart", REWRITE_TRANSFORMER)
+         ])])
+       ]).create();
 
-    createLockFile('myapp', pkg: ['barback']);
+       createLockFile('myapp', pkg: ['barback']);
 
-    var pub = startPubServe();
-    pub.stderr.expect(startsWith('No transformers that accept configuration '
-        'were defined in '));
-    pub.shouldExit(1);
+       var pub = startPubServe();
+       pub.stderr.expect(startsWith('No transformers that accept configuration '
+           'were defined in '));
+       pub.shouldExit(1);
+     });
   });
 }