TestCmdlineParser: properly reset settings and parser between tests (#5310)

test/fixture.cpp

@@ -91,6 +91,8 @@ bool TestFixture::prepareTest(const char testname[])
     mTemplateFormat.clear();
     mTemplateLocation.clear();
 
+    prepareTestInternal();
+
     // Check if tests should be executed
     if (testToRun.empty() || testToRun == testname) {
         // Tests will be executed - prepare them

test/fixture.h

@@ -60,6 +60,7 @@ protected:
     virtual void run() = 0;
 
     bool prepareTest(const char testname[]);
+    virtual void prepareTestInternal() {}
     std::string getLocationStr(const char * const filename, const unsigned int linenr) const;
 
     bool assert_(const char * const filename, const unsigned int linenr, const bool condition) const;