break up unittests into categories

unit_test/scale_test.cc

Index: unit_test/scale_test.cc
diff --git a/unit_test/scale_test.cc b/unit_test/scale_test.cc
index 23d03ca9d8199d3df8ff2fca0366357aafc0bfbb..49c07da54250d9c5ce89b76312433bff8fe4002e 100644
--- a/unit_test/scale_test.cc
+++ b/unit_test/scale_test.cc
@@ -274,11 +274,11 @@ static int TestFilter_16(int src_width, int src_height,
 // The following adjustments in dimensions ensure the scale factor will be
 // exactly achieved.
 // 2 is chroma subsample
-#define DX(x, nom, denom) ((int)(Abs(x) / nom / 2) * nom * 2)
-#define SX(x, nom, denom) ((int)(x / nom / 2) * denom * 2)
+#define DX(x, nom, denom) static_cast<int>((Abs(x) / nom / 2) * nom * 2)
+#define SX(x, nom, denom) static_cast<int>((x / nom / 2) * denom * 2)
 
 #define TEST_FACTOR1(name, filter, nom, denom, max_diff)                       \
-    TEST_F(libyuvTest, ScaleDownBy##name##_##filter) {                         \
+    TEST_F(LibYUVScaleTest, ScaleDownBy##name##_##filter) {                    \
       int diff = TestFilter(SX(benchmark_width_, nom, denom),                  \
                             SX(benchmark_height_, nom, denom),                 \
                             DX(benchmark_width_, nom, denom),                  \
@@ -287,7 +287,7 @@ static int TestFilter_16(int src_width, int src_height,
                             disable_cpu_flags_);                               \
       EXPECT_LE(diff, max_diff);                                               \
     }                                                                          \
-    TEST_F(libyuvTest, DISABLED_ScaleDownBy##name##_##filter##_16) {           \
+    TEST_F(LibYUVScaleTest, DISABLED_ScaleDownBy##name##_##filter##_16) {      \
       int diff = TestFilter_16(SX(benchmark_width_, nom, denom),               \
                                SX(benchmark_height_, nom, denom),              \
                                DX(benchmark_width_, nom, denom),               \
@@ -316,28 +316,28 @@ TEST_FACTOR(3, 1, 3)
 #undef DX
 
 #define TEST_SCALETO1(name, width, height, filter, max_diff)                   \
-    TEST_F(libyuvTest, name##To##width##x##height##_##filter) {                \
+    TEST_F(LibYUVScaleTest, name##To##width##x##height##_##filter) {           \
       int diff = TestFilter(benchmark_width_, benchmark_height_,               \
                             width, height,                                     \
                             kFilter##filter, benchmark_iterations_,            \
                             disable_cpu_flags_);                               \
       EXPECT_LE(diff, max_diff);                                               \
     }                                                                          \
-    TEST_F(libyuvTest, name##From##width##x##height##_##filter) {              \
+    TEST_F(LibYUVScaleTest, name##From##width##x##height##_##filter) {         \
       int diff = TestFilter(width, height,                                     \
                             Abs(benchmark_width_), Abs(benchmark_height_),     \
                             kFilter##filter, benchmark_iterations_,            \
                             disable_cpu_flags_);                               \
       EXPECT_LE(diff, max_diff);                                               \
     }                                                                          \
-    TEST_F(libyuvTest,                                                         \
+    TEST_F(LibYUVScaleTest,                                                    \
         DISABLED_##name##To##width##x##height##_##filter##_16) {               \
       int diff = TestFilter_16(benchmark_width_, benchmark_height_,            \
                                width, height,                                  \
                                kFilter##filter, benchmark_iterations_);        \
       EXPECT_LE(diff, max_diff);                                               \
     }                                                                          \
-    TEST_F(libyuvTest,                                                         \
+    TEST_F(LibYUVScaleTest,                                                    \
         DISABLED_##name##From##width##x##height##_##filter##_16) {             \
       int diff = TestFilter_16(width, height,                                  \
                                Abs(benchmark_width_), Abs(benchmark_height_),  \