Issue #18409: Idle: add unittest for AutoComplete. Patch by Phil Webster.

Lib/idlelib/AutoComplete.py

@@ -226,3 +226,8 @@ class AutoComplete:
         namespace = sys.modules.copy()
         namespace.update(__main__.__dict__)
         return eval(name, namespace)
+
+
+if __name__ == '__main__':
+    from unittest import main
+    main('idlelib.idle_test.test_autocomplete', verbosity=2)

Lib/idlelib/idle_test/mock_idle.py

@@ -5,6 +5,22 @@ Attributes and methods will be added as needed for tests.
 
 from idlelib.idle_test.mock_tk import Text
 
+class Func:
+    '''Mock function captures args and returns result set by test.
+
+    Most common use will probably be to mock methods.
+    mock_tk.Var and Mbox_func are special cases of this.
+    '''
+    def __init__(self, result=None):
+        self.result = result
+        self.args = None
+        self.kwds = None
+    def __call__(self, *args, **kwds):
+        self.args = args
+        self.kwds = kwds
+        return self.result
+
+
 class Editor:
     '''Minimally imitate EditorWindow.EditorWindow class.
     '''
@@ -17,6 +33,7 @@ class Editor:
         last = self.text.index('end')
         return first, last
 
+
 class UndoDelegator:
     '''Minimally imitate UndoDelegator,UndoDelegator class.
     '''

Lib/idlelib/idle_test/mock_tk.py

 """Classes that replace tkinter gui objects used by an object being tested.
 
-A gui object is anything with a master or parent paramenter, which is typically
-required in spite of what the doc strings say.
+A gui object is anything with a master or parent paramenter, which is
+typically required in spite of what the doc strings say.
 """
 
+class Event:
+    '''Minimal mock with attributes for testing event handlers.
+
+    This is not a gui object, but is used as an argument for callbacks
+    that access attributes of the event passed. If a callback ignores
+    the event, other than the fact that is happened, pass 'event'.
+
+    Keyboard, mouse, window, and other sources generate Event instances.
+    Event instances have the following attributes: serial (number of
+    event), time (of event), type (of event as number), widget (in which
+    event occurred), and x,y (position of mouse). There are other
+    attributes for specific events, such as keycode for key events.
+    tkinter.Event.__doc__ has more but is still not complete.
+    '''
+    def __init__(self, **kwds):
+        "Create event with attributes needed for test"
+        self.__dict__.update(kwds)
+
 class Var:
     "Use for String/Int/BooleanVar: incomplete"
     def __init__(self, master=None, value=None, name=None):
@@ -20,9 +38,10 @@ class Mbox_func:
 
     Instead of displaying a message box, the mock's call method saves the
     arguments as instance attributes, which test functions can then examime.
+    The test can set the result returned to ask function
     """
-    def __init__(self):
-        self.result = None  # The return for all show funcs
+    def __init__(self, result=None):
+        self.result = result  # Return None for all show funcs
     def __call__(self, title, message, *args, **kwds):
         # Save all args for possible examination by tester
         self.title = title

Lib/idlelib/idle_test/test_autocomplete.py

+import unittest
+from test.support import requires
+from tkinter import Tk, Text, TclError
+
+import idlelib.AutoComplete as ac
+import idlelib.AutoCompleteWindow as acw
+import idlelib.macosxSupport as mac
+from idlelib.EditorWindow import EditorWindow
+from idlelib.idle_test.mock_idle import Func
+from idlelib.idle_test.mock_tk import Event
+
+class AutoCompleteWindow:
+    def complete():
+        return
+
+
+class AutoCompleteTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        cls.root = Tk()
+        mac.setupApp(cls.root, None)
+        cls.editor = EditorWindow(root=cls.root)
+        cls.text = cls.editor.text
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+        del cls.text
+        del cls.editor
+        del cls.root
+
+    def setUp(self):
+        self.editor.text.delete('1.0', 'end')
+        self.autocomplete = ac.AutoComplete(self.editor)
+
+    def test_init(self):
+        self.assertEqual(self.autocomplete.editwin, self.editor)
+
+    def test_make_autocomplete_window(self):
+        testwin = self.autocomplete._make_autocomplete_window()
+        self.assertIsInstance(testwin, acw.AutoCompleteWindow)
+
+    def test_remove_autocomplete_window(self):
+        self.autocomplete.autocompletewindow = (
+            self.autocomplete._make_autocomplete_window())
+        self.autocomplete._remove_autocomplete_window()
+        self.assertIsNone(self.autocomplete.autocompletewindow)
+
+    def test_force_open_completions_event(self):
+        # Test that force_open_completions_event calls _open_completions
+        o_cs = Func()
+        self.autocomplete.open_completions = o_cs
+        self.autocomplete.force_open_completions_event('event')
+        self.assertEqual(o_cs.args, (True, False, True))
+
+    def test_try_open_completions_event(self):
+        Equal = self.assertEqual
+        autocomplete = self.autocomplete
+        trycompletions = self.autocomplete.try_open_completions_event
+        o_c_l = Func()
+        autocomplete._open_completions_later = o_c_l
+
+        # _open_completions_later should not be called with no text in editor
+        trycompletions('event')
+        Equal(o_c_l.args, None)
+
+        # _open_completions_later should be called with COMPLETE_ATTRIBUTES (1)
+        self.text.insert('1.0', 're.')
+        trycompletions('event')
+        Equal(o_c_l.args, (False, False, False, 1))
+
+        # _open_completions_later should be called with COMPLETE_FILES (2)
+        self.text.delete('1.0', 'end')
+        self.text.insert('1.0', '"./Lib/')
+        trycompletions('event')
+        Equal(o_c_l.args, (False, False, False, 2))
+
+    def test_autocomplete_event(self):
+        Equal = self.assertEqual
+        autocomplete = self.autocomplete
+
+        # Test that the autocomplete event is ignored if user is pressing a
+        # modifier key in addition to the tab key
+        ev = Event(mc_state=True)
+        self.assertIsNone(autocomplete.autocomplete_event(ev))
+        del ev.mc_state
+
+        # If autocomplete window is open, complete() method is called
+        testwin = self.autocomplete._make_autocomplete_window()
+        self.text.insert('1.0', 're.')
+        Equal(self.autocomplete.autocomplete_event(ev), 'break')
+
+        # If autocomplete window is not active or does not exist,
+        # open_completions is called. Return depends on its return.
+        autocomplete._remove_autocomplete_window()
+        o_cs = Func()  # .result = None
+        autocomplete.open_completions = o_cs
+        Equal(self.autocomplete.autocomplete_event(ev), None)
+        Equal(o_cs.args, (False, True, True))
+        o_cs.result = True
+        Equal(self.autocomplete.autocomplete_event(ev), 'break')
+        Equal(o_cs.args, (False, True, True))
+
+    def test_open_completions_later(self):
+        # Test that autocomplete._delayed_completion_id is set
+        pass
+
+    def test_delayed_open_completions(self):
+        # Test that autocomplete._delayed_completion_id set to None and that
+        # open_completions only called if insertion index is the same as
+        # _delayed_completion_index
+        pass
+
+    def test_open_completions(self):
+        # Test completions of files and attributes as well as non-completion
+        # of errors
+        pass
+
+    def test_fetch_completions(self):
+        # Test that fetch_completions returns 2 lists:
+        # For attribute completion, a large list containing all variables, and
+        # a small list containing non-private variables.
+        # For file completion, a large list containing all files in the path,
+        # and a small list containing files that do not start with '.'
+        pass
+
+    def test_get_entity(self):
+        # Test that a name is in the namespace of sys.modules and
+        # __main__.__dict__
+        pass
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)

Misc/NEWS

@@ -63,6 +63,11 @@ Build
 
 - Issue #17095: Fix Modules/Setup *shared* support.
 
+IDLE
+----
+
+- Issue #18409: Add unittest for AutoComplete. Patch by Phil Webster.
+
 Tests
 -----