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diff --git a/lib/python2.7/idlelib/idle_test/mock_idle.py b/lib/python2.7/idlelib/idle_test/mock_idle.py
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+'''Mock classes that imitate idlelib modules or classes.
+
+Attributes and methods will be added as needed for tests.
+'''
+
+from idlelib.idle_test.mock_tk import Text
+
+class Func(object):
+    '''Mock function captures args and returns result set by test.
+
+    Attributes:
+    self.called - records call even if no args, kwds passed.
+    self.result - set by init, returned by call.
+    self.args - captures positional arguments.
+    self.kwds - captures keyword arguments.
+
+    Most common use will probably be to mock methods.
+    Mock_tk.Var and Mbox_func are special variants of this.
+    '''
+    def __init__(self, result=None):
+        self.called = False
+        self.result = result
+        self.args = None
+        self.kwds = None
+    def __call__(self, *args, **kwds):
+        self.called = True
+        self.args = args
+        self.kwds = kwds
+        if isinstance(self.result, BaseException):
+            raise self.result
+        else:
+            return self.result
+
+
+class Editor(object):
+    '''Minimally imitate EditorWindow.EditorWindow class.
+    '''
+    def __init__(self, flist=None, filename=None, key=None, root=None):
+        self.text = Text()
+        self.undo = UndoDelegator()
+
+    def get_selection_indices(self):
+        first = self.text.index('1.0')
+        last = self.text.index('end')
+        return first, last
+
+
+class UndoDelegator(object):
+    '''Minimally imitate UndoDelegator,UndoDelegator class.
+    '''
+    # A real undo block is only needed for user interaction.
+    def undo_block_start(*args):
+        pass
+    def undo_block_stop(*args):
+        pass