3 files changed, 99 insertions, 0 deletions
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index 6a5c18945..4ea0076e9 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -1,5 +1,6 @@
 add_executable(tests
     common/bit_field.cpp
+    common/cityhash.cpp
     common/fibers.cpp
     common/param_package.cpp
     common/ring_buffer.cpp
diff --git a/src/tests/common/cityhash.cpp b/src/tests/common/cityhash.cpp
new file mode 100644
index 000000000..7a40b6c4a
--- /dev/null
+++ b/src/tests/common/cityhash.cpp
@@ -0,0 +1,22 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <catch2/catch.hpp>
+
+#include "common/cityhash.h"
+
+constexpr char msg[] = "The blue frogs are singing under the crimson sky.\n"
+                       "It is time to run, Robert.";
+
+using namespace Common;
+
+TEST_CASE("CityHash", "[common]") {
+    // These test results were built against a known good version.
+    REQUIRE(CityHash64(msg, sizeof(msg)) == 0x92d5c2e9cbfbbc01);
+    REQUIRE(CityHash64WithSeed(msg, sizeof(msg), 0xdead) == 0xbfbe93f21a2820dd);
+    REQUIRE(CityHash64WithSeeds(msg, sizeof(msg), 0xbeef, 0xcafe) == 0xb343317955fc8a06);
+    REQUIRE(CityHash128(msg, sizeof(msg)) == u128{0x98e60d0423747eaa, 0xd8694c5b6fcaede9});
+    REQUIRE(CityHash128WithSeed(msg, sizeof(msg), {0xdead, 0xbeef}) ==
+            u128{0xf0307dba81199ebe, 0xd77764e0c4a9eb74});
+}
diff --git a/src/tests/video_core/buffer_base.cpp b/src/tests/video_core/buffer_base.cpp
index 651633e9e..edced69bb 100644
--- a/src/tests/video_core/buffer_base.cpp
+++ b/src/tests/video_core/buffer_base.cpp
@@ -471,3 +471,79 @@ TEST_CASE("BufferBase: Unaligned page region query") {
     REQUIRE(buffer.IsRegionCpuModified(c + 4000, 1000));
     REQUIRE(buffer.IsRegionCpuModified(c + 4000, 1));
 }
+
+TEST_CASE("BufferBase: Cached write") {
+    RasterizerInterface rasterizer;
+    BufferBase buffer(rasterizer, c, WORD);
+    buffer.UnmarkRegionAsCpuModified(c, WORD);
+    buffer.CachedCpuWrite(c + PAGE, PAGE);
+    REQUIRE(!buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    buffer.FlushCachedWrites();
+    REQUIRE(buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    buffer.MarkRegionAsCpuModified(c, WORD);
+    REQUIRE(rasterizer.Count() == 0);
+}
+
+TEST_CASE("BufferBase: Multiple cached write") {
+    RasterizerInterface rasterizer;
+    BufferBase buffer(rasterizer, c, WORD);
+    buffer.UnmarkRegionAsCpuModified(c, WORD);
+    buffer.CachedCpuWrite(c + PAGE, PAGE);
+    buffer.CachedCpuWrite(c + PAGE * 3, PAGE);
+    REQUIRE(!buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    REQUIRE(!buffer.IsRegionCpuModified(c + PAGE * 3, PAGE));
+    buffer.FlushCachedWrites();
+    REQUIRE(buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    REQUIRE(buffer.IsRegionCpuModified(c + PAGE * 3, PAGE));
+    buffer.MarkRegionAsCpuModified(c, WORD);
+    REQUIRE(rasterizer.Count() == 0);
+}
+
+TEST_CASE("BufferBase: Cached write unmarked") {
+    RasterizerInterface rasterizer;
+    BufferBase buffer(rasterizer, c, WORD);
+    buffer.UnmarkRegionAsCpuModified(c, WORD);
+    buffer.CachedCpuWrite(c + PAGE, PAGE);
+    buffer.UnmarkRegionAsCpuModified(c + PAGE, PAGE);
+    REQUIRE(!buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    buffer.FlushCachedWrites();
+    REQUIRE(buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    buffer.MarkRegionAsCpuModified(c, WORD);
+    REQUIRE(rasterizer.Count() == 0);
+}
+
+TEST_CASE("BufferBase: Cached write iterated") {
+    RasterizerInterface rasterizer;
+    BufferBase buffer(rasterizer, c, WORD);
+    buffer.UnmarkRegionAsCpuModified(c, WORD);
+    buffer.CachedCpuWrite(c + PAGE, PAGE);
+    int num = 0;
+    buffer.ForEachUploadRange(c, WORD, [&](u64 offset, u64 size) { ++num; });
+    REQUIRE(num == 0);
+    REQUIRE(!buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    buffer.FlushCachedWrites();
+    REQUIRE(buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    buffer.MarkRegionAsCpuModified(c, WORD);
+    REQUIRE(rasterizer.Count() == 0);
+}
+
+TEST_CASE("BufferBase: Cached write downloads") {
+    RasterizerInterface rasterizer;
+    BufferBase buffer(rasterizer, c, WORD);
+    buffer.UnmarkRegionAsCpuModified(c, WORD);
+    REQUIRE(rasterizer.Count() == 64);
+    buffer.CachedCpuWrite(c + PAGE, PAGE);
+    REQUIRE(rasterizer.Count() == 63);
+    buffer.MarkRegionAsGpuModified(c + PAGE, PAGE);
+    int num = 0;
+    buffer.ForEachDownloadRange(c, WORD, [&](u64 offset, u64 size) { ++num; });
+    buffer.ForEachUploadRange(c, WORD, [&](u64 offset, u64 size) { ++num; });
+    REQUIRE(num == 0);
+    REQUIRE(!buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    REQUIRE(!buffer.IsRegionGpuModified(c + PAGE, PAGE));
+    buffer.FlushCachedWrites();
+    REQUIRE(buffer.IsRegionCpuModified(c + PAGE, PAGE));
+    REQUIRE(!buffer.IsRegionGpuModified(c + PAGE, PAGE));
+    buffer.MarkRegionAsCpuModified(c, WORD);
+    REQUIRE(rasterizer.Count() == 0);
+}