Add test to make sure that all type_t objects implement a hash != None

Author: iMichka

unittests/test_hash.py

@@ -0,0 +1,69 @@
+# Copyright 2014-2017 Insight Software Consortium.
+# Copyright 2004-2009 Roman Yakovenko.
+# Distributed under the Boost Software License, Version 1.0.
+# See http://www.boost.org/LICENSE_1_0.txt
+
+import unittest
+import inspect
+
+from pygccxml import declarations
+
+
+class Test(unittest.TestCase):
+
+    def test_types_hashes(self):
+        """
+        Test if all the type_t instances implement a hash method.
+
+        The hash is part of the public API, as there are multiple tools
+        that rely on it to compare type_t instances.
+
+        The best way to test this is to instanciate dummy type_t objects
+        for each class that subclasses type_t, and check that the hash of
+        these objects is not None.
+
+        """
+        members = inspect.getmembers(declarations, inspect.isclass)
+        for member in members:
+            member_type = member[1]
+            is_type_t_subclass = issubclass(member_type, declarations.type_t)
+            is_not_type_t = member_type != declarations.type_t
+            if is_type_t_subclass and is_not_type_t:
+                type_mockup = _create_type_t_mockup(member_type)
+                self.assertIsNotNone(hash(type_mockup))
+
+
+def _create_type_t_mockup(member_type):
+    nbr_parameters = len(inspect.signature(member_type).parameters)
+    if nbr_parameters == 0:
+        m = member_type()
+    else:
+        m = member_type(_base_mockup())
+    m.cache.decl_string = ""
+    return m
+
+
+class _base_mockup(declarations.type_t):
+
+    def __init__(self):
+        declarations.type_t.__init__(self)
+        self.cache.decl_string = ""
+        self._decl_string = ""
+        self.variable_type = declarations.type_t()
+
+    def build_decl_string(self, with_defaults=False):
+        return self._decl_string
+
+
+def create_suite():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(Test))
+    return suite
+
+
+def run_suite():
+    unittest.TextTestRunner(verbosity=2).run(create_suite())
+
+
+if __name__ == "__main__":
+    run_suite()