Add final opaque to transparent gradient test.

PVRTCEncoder/test/CMakeLists.txt

@@ -76,7 +76,7 @@ IF(PVRTEXLIB_FOUND)
 
   # Copy the .pvr files that we will use for testing...
   SET(TEST_IMAGES
-    gradient white gray transparent
+    gradient white gray transparent trans-gradient
   )
   FOREACH(IMAGE ${TEST_IMAGES})
     FILE(COPY

PVRTCEncoder/test/DecompTestPVR.cpp

@@ -123,3 +123,7 @@ TEST(Decompressor, DecompressTransparent) {
   ImageTester("transparent.pvr");
 }
 
+TEST(Decompressor, DecompressTransGradient) {
+  ImageTester("trans-gradient.pvr");
+}
+