Do not test global platform.

- change the test to use locally allocated object

Change-Id: Ie0818a4791d03d8f9004aba312f58fa0746c608b

unit_tests/platform/platform_negative_tests.cpp

@@ -33,26 +33,13 @@ extern bool getDevicesResult;
 
 struct PlatformNegativeTest : public ::testing::Test {
     void SetUp() override {
-        pPlatform = platform();
+        pPlatform.reset(new Platform());
     }
 
-    Platform *pPlatform = nullptr;
+    std::unique_ptr<Platform> pPlatform;
 };
 
 TEST_F(PlatformNegativeTest, GivenPlatformWhenGetDevicesFailedThenFalseIsReturned) {
-    class PlatformShutdown {
-      public:
-        PlatformShutdown(Platform *pPlatform) : pPlatform(pPlatform) {
-            pPlatform->shutdown();
-        }
-        ~PlatformShutdown() {
-            pPlatform->shutdown();
-        }
-
-      protected:
-        Platform *pPlatform = nullptr;
-    } a(pPlatform);
-
     VariableBackup<decltype(getDevicesResult)> bkp(&getDevicesResult, false);
 
     auto ret = pPlatform->initialize();

unit_tests/platform/platform_tests.cpp

@@ -34,14 +34,9 @@
 using namespace OCLRT;
 
 struct PlatformTest : public ::testing::Test {
-    PlatformTest() {}
+    void SetUp() override { pPlatform.reset(new Platform()); }
-
-    void SetUp() override { pPlatform = platform(); }
-
-    void TearDown() override {}
-
     cl_int retVal = CL_SUCCESS;
-    Platform *pPlatform = nullptr;
+    std::unique_ptr<Platform> pPlatform;
 };
 
 TEST_F(PlatformTest, getDevices) {