[tests] ASSnapshotTestCase.

AsyncDisplayKitTests/ASSnapshotTestCase.h

@@ -0,0 +1,26 @@
+/* Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import "FBSnapshotTestCase.h"
+
+#import <AsyncDisplayKit/ASDisplayNode.h>
+
+#define ASSnapshotVerifyNode(node__, identifier__) \
+{ \
+  [ASSnapshotTestCase hackilySynchronouslyRecursivelyRenderNode:node__]; \
+  FBSnapshotVerifyLayer(node__.layer, identifier__); \
+}
+
+@interface ASSnapshotTestCase : FBSnapshotTestCase
+
+/**
+ * Hack for testing.  ASDisplayNode lacks an explicit -render method, so we manually hit its layout & display codepaths.
+ */
++ (void)hackilySynchronouslyRecursivelyRenderNode:(ASDisplayNode *)node;
+
+@end