add ut about nce in transpiler

python/paddle/fluid/tests/unittests/test_dist_transpiler.py

@@ -870,9 +870,21 @@ class TestRemoteNce(TestDistLookupTableBase):
 
     def transpiler_test_impl(self):
         trainer, _ = self.get_trainer()
+
+        out_vars = ["nce_w.block0", "nce_w.block1"]
+        in_vars = ["nce_b.block0", "nce_b.block1"]
+
+        recv_var_names = []
+
         for op in trainer.blocks[0].ops:
             if op.type == "recv":
-                pass
+                for var in op.output("Out"):
+                    recv_var_names.append(var)
+
+        for out_var in out_vars:
+            self.assertFalse(out_var in recv_var_names)
+        for in_var in in_vars:
+            self.assertTrue(in_var in recv_var_names)
 
 
 if __name__ == "__main__":