Add wxOVERRIDE to test files

And cleanup some tailing spaces and tabs.

tests/strings/numformatter.cpp

@@ -28,7 +28,7 @@ class NumFormatterTestCase : public CppUnit::TestCase
 public:
     NumFormatterTestCase() { m_locale = NULL; }
 
-    virtual void setUp()
+    virtual void setUp() wxOVERRIDE
     {
         // We need to use a locale with known decimal point and which uses the
         // thousands separator for the tests to make sense.
@@ -38,7 +38,7 @@ public:
             tearDown();
     }
 
-    virtual void tearDown()
+    virtual void tearDown() wxOVERRIDE
     {
         delete m_locale;
         m_locale = NULL;

tests/strings/unichar.cpp

@@ -1156,4 +1156,4 @@ void UniCharTestCase::RefWideCharCompare()
     wxUNICHARREF_TEST_INT_COMPARE
 }
 
-#endif
+#endif

tests/strings/vsnprintf.cpp

@@ -166,7 +166,7 @@ private:
 #endif
     void Unicode();
 
-    template<typename T> 
+    template<typename T>
         void DoBigToSmallBuffer(T *buffer, int size);
     void BigToSmallBuffer();
 
@@ -251,12 +251,12 @@ void VsnprintfTestCase::P()
         CMP3i("0000ABCDEFABCDEF", "%p", (void*)0xABCDEFABCDEF);
         CMP3("0000000000000000", "%p", (void*)NULL);
     #endif
-#elif defined(__MINGW32__) 
+#elif defined(__MINGW32__)
     // mingw32 uses MSVC CRT in old versions but is own implementation now
     // which is somewhere in the middle as it uses %8x, so to catch both cases
     // we use case-insensitive comparison here.
-    CMP3("0xabcdef", "%p", (void*)0xABCDEF); 
-    CMP3("0", "%p", (void*)NULL); 
+    CMP3("0xabcdef", "%p", (void*)0xABCDEF);
+    CMP3("0", "%p", (void*)NULL);
 #elif defined(__GNUG__)
     // glibc prints pointers as %#x except for NULL pointers which are printed
     // as '(nil)'.