89: Moved ClassChecker from test_public.py into tstutil.py; improved unit tests for plugable.ReadOnly

ipalib/tests/test_plugable.py

@@ -22,9 +22,58 @@ Unit tests for `ipalib.plugable` module.
 """
 
 from tstutil import raises, getitem, no_set, no_del, read_only
+from tstutil import ClassChecker
 from ipalib import plugable, errors
 
 
+class test_ReadOnly(ClassChecker):
+    """
+    Test the plugable.ReadOnly class
+    """
+    _cls = plugable.ReadOnly
+
+    def test_class(self):
+        assert self.cls.__bases__ == (object,)
+
+    def test_when_unlocked(self):
+        """
+        Test that default state is unlocked, that setting and deleting
+        attributes works.
+        """
+        o = self.cls()
+
+        # Setting:
+        o.hello = 'world'
+        assert o.hello == 'world'
+
+        # Deleting:
+        del o.hello
+        assert not hasattr(o, 'hello')
+
+    def test_when_locked(self):
+        """
+        Test that after __lock__() has been called, setting or deleting an
+        attribute raises AttributeError.
+        """
+        obj = self.cls()
+        obj.__lock__()
+        names = ['not_an_attribute', 'an_attribute']
+        for name in names:
+            no_set(obj, name)
+            no_del(obj, name)
+
+        class some_ro_class(self.cls):
+            def __init__(self):
+                self.an_attribute = 'Hello world!'
+                self.__lock__()
+        obj = some_ro_class()
+        for name in names:
+            no_set(obj, name)
+            no_del(obj, name)
+        assert read_only(obj, 'an_attribute') == 'Hello world!'
+
+
+
 def test_valid_identifier():
     f = plugable.check_identifier
     okay = [
@@ -125,23 +174,7 @@ def test_Plugin():
     raises(AssertionError, p.finalize, api)
 
 
-def test_ReadOnly():
-    obj = plugable.ReadOnly()
-    obj.__lock__()
-    names = ['not_an_attribute', 'an_attribute']
-    for name in names:
-        no_set(obj, name)
-        no_del(obj, name)
 
-    class some_ro_class(plugable.ReadOnly):
-        def __init__(self):
-            self.an_attribute = 'Hello world!'
-            self.__lock__()
-    obj = some_ro_class()
-    for name in names:
-        no_set(obj, name)
-        no_del(obj, name)
-    assert read_only(obj, 'an_attribute') == 'Hello world!'
 
 
 def test_Proxy():

ipalib/tests/test_public.py

@@ -21,7 +21,7 @@
 Unit tests for `ipalib.public` module.
 """
 
-from tstutil import raises, getitem, no_set, no_del, read_only
+from tstutil import raises, getitem, no_set, no_del, read_only, ClassChecker
 from ipalib import public, plugable, errors
 
 
@@ -63,27 +63,7 @@ def test_is_rule():
     assert not is_rule(call(None))
 
 
-class ClassChecker(object):
-    __cls = None
-    __subcls = None
 
-    def __get_cls(self):
-        if self.__cls is None:
-            self.__cls = self._cls
-        return self.__cls
-    cls = property(__get_cls)
-
-    def __get_subcls(self):
-        if self.__subcls is None:
-            self.__subcls = self.get_subcls()
-        return self.__subcls
-    subcls = property(__get_subcls)
-
-    def get_subcls(self):
-        raise NotImplementedError(
-            self.__class__.__name__,
-            'get_subcls()'
-        )
 
 
 class test_option(ClassChecker):

ipalib/tests/tstutil.py

@@ -21,6 +21,8 @@
 Utility functions for the unit tests.
 """
 
+import inspect
+
 class ExceptionNotRaised(Exception):
     """
     Exception raised when an *expected* exception is *not* raised during a
@@ -91,9 +93,25 @@ def is_prop(prop):
 
 
 class ClassChecker(object):
+    __cls = None
+    __subcls = None
 
-    def new(self, *args, **kw):
-        return self.cls(*args, **kw)
+    def __get_cls(self):
+        if self.__cls is None:
+            self.__cls = self._cls
+        assert inspect.isclass(self.__cls)
+        return self.__cls
+    cls = property(__get_cls)
 
-    def get_sub(self):
-        raise NotImplementedError('get_sub()')
+    def __get_subcls(self):
+        if self.__subcls is None:
+            self.__subcls = self.get_subcls()
+        assert inspect.isclass(self.__subcls)
+        return self.__subcls
+    subcls = property(__get_subcls)
+
+    def get_subcls(self):
+        raise NotImplementedError(
+            self.__class__.__name__,
+            'get_subcls()'
+        )