diff --git a/python/paddle/fluid/tests/unittests/test_rnn_op.py b/python/paddle/fluid/tests/unittests/test_rnn_op.py
index 44530bfba3061..79e33166bb6f8 100644
--- a/python/paddle/fluid/tests/unittests/test_rnn_op.py
+++ b/python/paddle/fluid/tests/unittests/test_rnn_op.py
@@ -173,5 +173,30 @@ def set_attrs(self):
         self.num_layers = 2
 
 
+class TestRNNOp6(TestRNNOp):
+    def set_attrs(self):
+        self.num_layers = 2
+        self.is_bidirec = True
+
+
+class TestRNNOp7(TestRNNOp):
+    def set_attrs(self):
+        self.num_layers = 2
+        self.is_bidirec = True
+        self.is_test = True
+
+
+class TestRNNOp8(TestRNNOp):
+    def set_attrs(self):
+        self.num_layers = 2
+        self.is_bidirec = True
+        self.sequence_length = None
+
+
+class TestRNNOp9(TestRNNOp):
+    def set_attrs(self):
+        self.num_layers = 3
+
+
 if __name__ == '__main__':
     unittest.main()