Rename hheader files to .cuh

test/test_utils/test_cublas_fixture.cuh

@@ -0,0 +1,10 @@
+#include "gtest/gtest.h"
+#include "cublas_v2.h"
+
+class CublasTestFixture : public ::testing::Test {
+protected:
+    static cublasHandle_t cublasHandle;
+
+    static void SetUpTestSuite();
+    static void TearDownTestSuite();
+};