add unit test

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

@@ -18,6 +18,9 @@ import unittest
 import numpy as np
 from op_test import OpTest
 
+import paddle.fluid.core as core
+from paddle.fluid.op import Operator
+
 
 class TestFillConstantOp1(OpTest):
     def setUp(self):
@@ -47,5 +50,27 @@ class TestFillConstantOp2(OpTest):
         self.check_output()
 
 
+class TestFillConstantOpWithSelectedRows(OpTest):
+    def check_with_place(self, place):
+        scope = core.Scope()
+        # create Out Variable
+        out = scope.var('Out').get_selected_rows()
+
+        # create and run fill_constant_op operator
+        fill_constant_op = Operator(
+            "fill_constant", shape=[123, 92], value=3.8, Out='Out')
+        fill_constant_op.run(scope, place)
+
+        # get result from Out
+        result_array = np.array(out)
+        self.assertEqual(result_array, np.full((123, 92), 3.8))
+
+    def test_fill_constant_with_selected_rows(self):
+        places = [core.CPUPlace()]
+        # currently only support CPU
+        for place in places:
+            self.check_with_place(place)
+
+
 if __name__ == "__main__":
     unittest.main()