Added all original pyside unit tests to the shiboken version.

tests/qtcore/qcoreapplication_instance_test.py

@@ -0,0 +1,20 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+'''Test cases for QCoreApplication.instance static method'''
+
+import unittest
+
+from PySide.QtCore import QCoreApplication
+
+class QCoreApplicationInstanceTest(unittest.TestCase):
+    '''Test cases for QCoreApplication.instance static method'''
+
+    def testQCoreApplicationInstance(self):
+        #Tests QCoreApplication.instance()
+        self.assertEqual(QCoreApplication.instance(), None)
+        app = QCoreApplication([])
+        self.assertEqual(QCoreApplication.instance(), app)
+
+if __name__ == '__main__':
+    unittest.main()
+