Get rid of useless VarArgTestCase test fixture

We don't need it any more, just define individual tests as independent
test cases.

This required using some other pointer instead of "this" in one of the
tests, but it doesn't really matter which pointer we use there anyhow.

No real changes.

tests/strings/vararg.cpp

@@ -24,53 +24,10 @@
 #include "wx/string.h"
 
 // ----------------------------------------------------------------------------
-// test class
+// tests themselves
 // ----------------------------------------------------------------------------
 
-class VarArgTestCase : public CppUnit::TestCase
+TEST_CASE("StringPrintf", "[wxString][Printf][vararg]")
-{
-public:
-    VarArgTestCase() {}
-
-private:
-    CPPUNIT_TEST_SUITE( VarArgTestCase );
-        CPPUNIT_TEST( StringPrintf );
-        CPPUNIT_TEST( CharPrintf );
-        CPPUNIT_TEST( SizetPrintf );
-#if wxUSE_STD_STRING
-        CPPUNIT_TEST( StdString );
-#endif
-#if wxUSE_LONGLONG
-        CPPUNIT_TEST( LongLongPrintf );
-#endif
-        CPPUNIT_TEST( Sscanf );
-        CPPUNIT_TEST( RepeatedPrintf );
-        CPPUNIT_TEST( ArgsValidation );
-    CPPUNIT_TEST_SUITE_END();
-
-    void StringPrintf();
-    void CharPrintf();
-    void SizetPrintf();
-#if wxUSE_STD_STRING
-    void StdString();
-#endif
-#if wxUSE_LONGLONG
-    void LongLongPrintf();
-#endif
-    void Sscanf();
-    void RepeatedPrintf();
-    void ArgsValidation();
-
-    wxDECLARE_NO_COPY_CLASS(VarArgTestCase);
-};
-
-// register in the unnamed registry so that these tests are run by default
-CPPUNIT_TEST_SUITE_REGISTRATION( VarArgTestCase );
-
-// also include in its own registry so that these tests can be run alone
-CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( VarArgTestCase, "VarArgTestCase" );
-
-void VarArgTestCase::StringPrintf()
 {
     wxString s, s2;
 
@@ -113,7 +70,7 @@ void VarArgTestCase::StringPrintf()
     wxCLANG_WARNING_RESTORE(c++11-compat-deprecated-writable-strings)
 }
 
-void VarArgTestCase::CharPrintf()
+TEST_CASE("CharPrintf", "[wxString][Printf][vararg]")
 {
     wxString foo("foo");
     wxString s;
@@ -151,7 +108,7 @@ void VarArgTestCase::CharPrintf()
     CPPUNIT_ASSERT_EQUAL( "value is 240 (int)", s );
 }
 
-void VarArgTestCase::SizetPrintf()
+TEST_CASE("SizetPrintf", "[wxString][Printf][vararg]")
 {
     size_t  i =  1;
     ssize_t j = -2;
@@ -170,7 +127,7 @@ void VarArgTestCase::SizetPrintf()
 }
 
 #if wxUSE_STD_STRING
-void VarArgTestCase::StdString()
+TEST_CASE("StdString", "[wxString][Printf][vararg]")
 {
     // test passing std::[w]string
     wxString s;
@@ -187,7 +144,7 @@ void VarArgTestCase::StdString()
 #endif // wxUSE_STD_STRING
 
 #if wxUSE_LONGLONG
-void VarArgTestCase::LongLongPrintf()
+TEST_CASE("LongLongPrintf", "[wxString][Printf][vararg]")
 {
     const char * const llfmt = "%" wxLongLongFmtSpec "d";
 
@@ -198,7 +155,7 @@ void VarArgTestCase::LongLongPrintf()
 }
 #endif // wxUSE_LONGLONG
 
-void VarArgTestCase::Sscanf()
+TEST_CASE("Sscanf", "[wxSscanf][vararg]")
 {
     int i = 0;
     char str[20];
@@ -223,7 +180,7 @@ void VarArgTestCase::Sscanf()
 #endif
 }
 
-void VarArgTestCase::RepeatedPrintf()
+TEST_CASE("RepeatedPrintf", "[wxString][Printf][vararg]")
 {
     wxCharBuffer buffer(2);
     char *p = buffer.data();
@@ -239,10 +196,10 @@ void VarArgTestCase::RepeatedPrintf()
     CPPUNIT_ASSERT_EQUAL("buffer hi, len 2", s);
 }
 
-void VarArgTestCase::ArgsValidation()
+TEST_CASE("ArgsValidation", "[wxString][vararg][error]")
 {
-    void *ptr = this;
     int written;
+    void *ptr = &written;
     short int swritten;
 
     // these are valid:
@@ -283,7 +240,7 @@ void VarArgTestCase::ArgsValidation()
 
     // but these are not:
     WX_ASSERT_FAILS_WITH_ASSERT( wxString::Format("%i", "foo") );
-    WX_ASSERT_FAILS_WITH_ASSERT( wxString::Format("%s", (void*)this) );
+    WX_ASSERT_FAILS_WITH_ASSERT( wxString::Format("%s", (void*)&written) );
     WX_ASSERT_FAILS_WITH_ASSERT( wxString::Format("%d", ptr) );
 
     // we don't check wxNO_PRINTF_PERCENT_N here as these expressions should
@@ -306,7 +263,7 @@ void VarArgTestCase::ArgsValidation()
     wxString::Format("%c", wxChar(80) + wxChar(1));
 
     // check size_t handling
-    size_t len = sizeof(*this);
+    size_t len = sizeof(ptr);
 #ifdef __WINDOWS__
     wxString::Format("%Iu", len);
 #else