Run pub tests against older versions of barback.

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

Index: sdk/lib/_internal/pub/test/transformer/loads_a_diamond_transformer_dependency_graph_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/loads_a_diamond_transformer_dependency_graph_test.dart b/sdk/lib/_internal/pub/test/transformer/loads_a_diamond_transformer_dependency_graph_test.dart
index ea9be413fa1f0d4d243bc89072680860cb6566e6..e7a35f2ff9f15d52b8f923e4ea8a235cf7998adb 100644
--- a/sdk/lib/_internal/pub/test/transformer/loads_a_diamond_transformer_dependency_graph_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/loads_a_diamond_transformer_dependency_graph_test.dart
@@ -10,70 +10,72 @@ import '../serve/utils.dart';
 
 main() {
   initConfig();
-  integration("loads a diamond transformer dependency graph", () {
-    d.dir("top", [
-      d.pubspec({
-        "name": "top",
-        "version": "1.0.0"
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer('top')),
-      ])
-    ]).create();
+  withBarbackVersions("any", () {
+    integration("loads a diamond transformer dependency graph", () {
+      d.dir("top", [
+        d.pubspec({
+          "name": "top",
+          "version": "1.0.0"
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer('top')),
+        ])
+      ]).create();
 
-    d.dir("left", [
-      d.pubspec({
-        "name": "left",
-        "version": "1.0.0",
-        "transformers": ["top/transformer"],
-        "dependencies": {"top": {"path": "../top"}}
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer('left')),
-      ])
-    ]).create();
+      d.dir("left", [
+        d.pubspec({
+          "name": "left",
+          "version": "1.0.0",
+          "transformers": ["top/transformer"],
+          "dependencies": {"top": {"path": "../top"}}
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer('left')),
+        ])
+      ]).create();
 
-    d.dir("right", [
-      d.pubspec({
-        "name": "right",
-        "version": "1.0.0",
-        "transformers": ["top/transformer"],
-        "dependencies": {"top": {"path": "../top"}}
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer('right')),
-      ])
-    ]).create();
+      d.dir("right", [
+        d.pubspec({
+          "name": "right",
+          "version": "1.0.0",
+          "transformers": ["top/transformer"],
+          "dependencies": {"top": {"path": "../top"}}
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer('right')),
+        ])
+      ]).create();
 
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": [
-          "left/transformer",
-          "right/transformer",
-          "myapp/transformer"
-        ],
-        "dependencies": {
-          'left': {'path': '../left'},
-          'right': {'path': '../right'},
-        }
-      }),
-      d.dir("lib", [
-        d.file("transformer.dart", dartTransformer('myapp'))
-      ]),
-      d.dir("web", [
-        d.file("main.dart", 'const TOKEN = "main.dart";')
-      ])
-    ]).create();
+      d.dir(appPath, [
+        d.pubspec({
+          "name": "myapp",
+          "transformers": [
+            "left/transformer",
+            "right/transformer",
+            "myapp/transformer"
+          ],
+          "dependencies": {
+            'left': {'path': '../left'},
+            'right': {'path': '../right'},
+          }
+        }),
+        d.dir("lib", [
+          d.file("transformer.dart", dartTransformer('myapp'))
+        ]),
+        d.dir("web", [
+          d.file("main.dart", 'const TOKEN = "main.dart";')
+        ])
+      ]).create();
 
-    createLockFile('myapp',
-        sandbox: ['top', 'left', 'right'],
-        pkg: ['barback']);
+      createLockFile('myapp',
+          sandbox: ['top', 'left', 'right'],
+          pkg: ['barback']);
 
-    pubServe();
-    requestShouldSucceed("main.dart",
-        'const TOKEN = "(((main.dart, (left, top)), (right, top)), ((myapp, '
-        '(left, top)), (right, top)))";');
-    endPubServe();
+      pubServe();
+      requestShouldSucceed("main.dart",
+          'const TOKEN = "(((main.dart, (left, top)), (right, top)), ((myapp, '
+          '(left, top)), (right, top)))";');
+      endPubServe();
+    });
   });
 }