TestingSwapChain: use lowercase diff marker in test image filenames

Author: TheMostDiligent

Tests/DiligentCoreAPITest/src/TestingSwapChainBaseTest.cpp

@@ -128,7 +128,7 @@ TEST(TestingSwapChainBaseTest, ToleratesConfiguredImageDifferences)
                       TEX_FORMAT_RGBA8_UNORM, DifferenceCounters, ComparisonAttribs);
     EXPECT_EQ(DifferenceCounters.size(), 1u);
     EXPECT_TRUE(FileSystem::FileExists(ImageGuard.GetFileName().c_str()));
-    EXPECT_NE(ImageGuard.GetFileName().find("_DIFF_OK"), std::string::npos);
+    EXPECT_NE(ImageGuard.GetFileName().find("_diff_OK"), std::string::npos);
 }
 
 #if !PLATFORM_WEB
@@ -185,7 +185,7 @@ TEST(TestingSwapChainBaseTest, AddsRenderDeviceTypeToDifferenceImageName)
                           TEX_FORMAT_RGBA8_UNORM, DifferenceCounters),
         "Image rendered by the test differs from the reference image");
     EXPECT_TRUE(FileSystem::FileExists(ImageGuard.GetFileName().c_str()));
-    EXPECT_NE(ImageGuard.GetFileName().find("_DIFF_FAIL"), std::string::npos);
+    EXPECT_NE(ImageGuard.GetFileName().find("_diff_FAIL"), std::string::npos);
 }
 
 TEST(TestingSwapChainBaseTest, ReportsToleratedAndBadPixelStatistics)

Tests/GPUTestFramework/src/TestingSwapChainBase.cpp

@@ -128,7 +128,7 @@ std::string GetTestImageDifferenceFileName(bool ComparisonPassed, Uint32 Differe
     FileName += ValidateName(TestInfo->name());
     FileName += '_';
     FileName += GetRenderDeviceTypeShortString(pEnvironment->GetDevice()->GetDeviceInfo().Type);
-    FileName += ComparisonPassed ? "_DIFF_OK" : "_DIFF_FAIL";
+    FileName += ComparisonPassed ? "_diff_OK" : "_diff_FAIL";
     if (DifferenceIndex > 0)
         FileName += std::to_string(DifferenceIndex);
     FileName += "_.png";