Add single pass to the test vectors of ForwardKeyTest

Added single pass encoding mode to the test vectors of
the existing ForwardKeyTest.

Change-Id: I02bf24625a2ad2f86a3b4ef201106fd2b1d55dd1
diff --git a/test/fwd_kf_test.cc b/test/fwd_kf_test.cc
index e36947c..fb12402 100644
--- a/test/fwd_kf_test.cc
+++ b/test/fwd_kf_test.cc
@@ -111,7 +111,8 @@
 }
 
 AV1_INSTANTIATE_TEST_SUITE(ForwardKeyTest,
-                           ::testing::Values(::libaom_test::kTwoPassGood),
+                           ::testing::Values(::libaom_test::kTwoPassGood,
+                                             ::libaom_test::kOnePassGood),
                            ::testing::ValuesIn(kTestParams));
 
 typedef struct {