Add test

Author: bdero

ci/licenses_golden/licenses_flutter

@@ -1526,6 +1526,7 @@ FILE: ../../../flutter/impeller/renderer/pipeline_builder.cc
 FILE: ../../../flutter/impeller/renderer/pipeline_builder.h
 FILE: ../../../flutter/impeller/renderer/pipeline_descriptor.cc
 FILE: ../../../flutter/impeller/renderer/pipeline_descriptor.h
+FILE: ../../../flutter/impeller/renderer/pipeline_descriptor_unittests.cc
 FILE: ../../../flutter/impeller/renderer/pipeline_library.cc
 FILE: ../../../flutter/impeller/renderer/pipeline_library.h
 FILE: ../../../flutter/impeller/renderer/platform.cc

impeller/renderer/BUILD.gn

@@ -106,6 +106,7 @@ impeller_component("renderer_unittests") {
   sources = [
     "device_buffer_unittests.cc",
     "host_buffer_unittests.cc",
+    "pipeline_descriptor_unittests.cc",
     "renderer_unittests.cc",
   ]
 

impeller/renderer/pipeline_descriptor_unittests.cc

@@ -0,0 +1,30 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <unordered_set>
+
+#include "flutter/testing/testing.h"
+#include "impeller/renderer/host_buffer.h"
+#include "impeller/renderer/pipeline_descriptor.h"
+
+namespace impeller {
+namespace testing {
+
+TEST(PipelineDescriptorTest, PrimitiveTypeHashEquality) {
+  PipelineDescriptor descA;
+  PipelineDescriptor descB;
+  std::unordered_set<PipelineDescriptor> set({descA});
+
+  ASSERT_EQ(descA, descB);
+  ASSERT_TRUE(set.find(descA) != set.end());
+  ASSERT_TRUE(set.find(descB) != set.end());
+
+  descA.SetPrimitiveType(PrimitiveType::kTriangleStrip);
+  ASSERT_NE(descA, descB);
+  ASSERT_FALSE(set.find(descA) != set.end());
+  ASSERT_TRUE(set.find(descB) != set.end());
+}
+
+}  // namespace  testing
+}  // namespace impeller