partial_idct_test: add _add_ test

The result of the transform is added to the destination buffers. In the
existing tests the destination buffer is always empty so that portion of
the code was never exercised.

Change-Id: I1858c4fed2274f1b9faf834d2ba4186a4510492a

1 files changed, 24 insertions, 0 deletions

diff --git a/test/partial_idct_test.cc b/test/partial_idct_test.cc
index c41813d26..0c704c5c8 100644
--- a/test/partial_idct_test.cc
+++ b/test/partial_idct_test.cc
@@ -162,6 +162,30 @@ TEST_P(PartialIDctTest, ResultsMatch) {
         << "Error: partial inverse transform produces different results";
   }
 }
+
+TEST_P(PartialIDctTest, AddOutputBlock) {
+  ACMRandom rnd(ACMRandom::DeterministicSeed());
+  const int count_test_block = 10;
+  for (int i = 0; i < count_test_block; ++i) {
+    memset(input_block_, 0, sizeof(*input_block_) * block_size_);
+    for (int j = 0; j < last_nonzero_; ++j) {
+      input_block_[vp9_default_scan_orders[tx_size_].scan[j]] = 10;
+    }
+
+    for (int j = 0; j < block_size_; ++j) {
+      output_block_[j] = output_block_ref_[j] = rnd.Rand8();
+    }
+
+    ASM_REGISTER_STATE_CHECK(
+        full_itxfm_(input_block_, output_block_ref_, size_));
+    ASM_REGISTER_STATE_CHECK(
+        partial_itxfm_(input_block_, output_block_, size_));
+
+    ASSERT_EQ(0, memcmp(output_block_ref_, output_block_,
+                        sizeof(*output_block_) * block_size_))
+        << "Error: Transform results are not correctly added to output.";
+  }
+}
 using std::tr1::make_tuple;
 
 INSTANTIATE_TEST_CASE_P(