Run pub tests against older versions of barback.

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

Index: sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart b/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
index 6d3e8a84998736d7d489a46f6c32d07d82a37078..0a61e5945598c661b30fad3e551dc76b5030e6d4 100644
--- a/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
@@ -16,23 +16,25 @@ main() {
 
   // A syntax error will cause the analyzer to fail to parse the transformer
   // when attempting to rewrite its imports.
-  integration("fails to load a transform with a syntax error", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": ["myapp/src/transformer"]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", "syntax error")
-      ])])
-    ]).create();
+  withBarbackVersions("any", () {
+    integration("fails to load a transform with a syntax error", () {
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "transformers": ["myapp/src/transformer"]
+        }),
+        d.dir("lib", [d.dir("src", [
+          d.file("transformer.dart", "syntax error")
+        ])])
+      ]).create();
 
-    createLockFile('myapp', pkg: ['barback']);
+      createLockFile('myapp', pkg: ['barback']);
 
-    var pub = startPubServe();
-    pub.stderr.expect('[RewriteImport]:');
-    pub.stderr.expect(startsWith('Error in'));
-    pub.shouldExit(1);
-    pub.stderr.expect(never(contains('This is an unexpected error')));
+      var pub = startPubServe();
+      pub.stderr.expect('[RewriteImport]:');
+      pub.stderr.expect(startsWith('Error in'));
+      pub.shouldExit(1);
+      pub.stderr.expect(never(contains('This is an unexpected error')));
+    });
   });
 }