diff --git a/image/test/gtest/Common.cpp b/image/test/gtest/Common.cpp
index 0cd30c61ce8..c310493c479 100644
--- a/image/test/gtest/Common.cpp
+++ b/image/test/gtest/Common.cpp
@@ -126,7 +126,7 @@ ImageTestCase GreenGIFTestCase()
 ImageTestCase GreenJPGTestCase()
 {
   return ImageTestCase("green.jpg", "image/jpeg", IntSize(100, 100),
-                       /* aFuzzy = */ true);
+                       TEST_CASE_IS_FUZZY);
 }
 
 ImageTestCase GreenBMPTestCase()
diff --git a/image/test/gtest/Common.h b/image/test/gtest/Common.h
index b9d8efa8142..b70a3e6aac3 100644
--- a/image/test/gtest/Common.h
+++ b/image/test/gtest/Common.h
@@ -17,22 +17,30 @@ namespace mozilla {
 // Types
 ///////////////////////////////////////////////////////////////////////////////
 
+enum TestCaseFlags
+{
+  TEST_CASE_DEFAULT_FLAGS   = 0,
+  TEST_CASE_IS_FUZZY        = 1 << 0,
+  TEST_CASE_IS_TRANSPARENT  = 1 << 1,
+  TEST_CASE_HAS_ERROR       = 1 << 2
+};
+
 struct ImageTestCase
 {
   ImageTestCase(const char* aPath,
                 const char* aMimeType,
                 gfx::IntSize aSize,
-                bool aFuzzy = false)
+                uint32_t aFlags = TEST_CASE_DEFAULT_FLAGS)
     : mPath(aPath)
     , mMimeType(aMimeType)
     , mSize(aSize)
-    , mFuzzy(aFuzzy)
+    , mFlags(aFlags)
   { }
 
   const char* mPath;
   const char* mMimeType;
   gfx::IntSize mSize;
-  bool mFuzzy;
+  uint32_t mFlags;
 };
 
 struct BGRAColor
diff --git a/image/test/gtest/TestDecodeToSurface.cpp b/image/test/gtest/TestDecodeToSurface.cpp
index 5a4696f8cdb..f48cff6906e 100644
--- a/image/test/gtest/TestDecodeToSurface.cpp
+++ b/image/test/gtest/TestDecodeToSurface.cpp
@@ -61,7 +61,8 @@ public:
                 surface->GetFormat() == SurfaceFormat::B8G8R8A8);
     EXPECT_EQ(mTestCase.mSize, surface->GetSize());
 
-    EXPECT_TRUE(IsSolidColor(surface, BGRAColor::Green(), mTestCase.mFuzzy));
+    EXPECT_TRUE(IsSolidColor(surface, BGRAColor::Green(),
+                             mTestCase.mFlags & TEST_CASE_IS_FUZZY));
   }
 
 private: