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1"Test tree. coverage 56%."
2
3from idlelib import tree
4import unittest
5from test.support import requires
6requires('gui')
7from tkinter import Tk, EventType, SCROLL
8
9
10class TreeTest(unittest.TestCase):
11
12    @classmethod
13    def setUpClass(cls):
14        cls.root = Tk()
15        cls.root.withdraw()
16
17    @classmethod
18    def tearDownClass(cls):
19        cls.root.destroy()
20        del cls.root
21
22    def test_init(self):
23        # Start with code slightly adapted from htest.
24        sc = tree.ScrolledCanvas(
25            self.root, bg="white", highlightthickness=0, takefocus=1)
26        sc.frame.pack(expand=1, fill="both", side='left')
27        item = tree.FileTreeItem(tree.ICONDIR)
28        node = tree.TreeNode(sc.canvas, None, item)
29        node.expand()
30
31
32class TestScrollEvent(unittest.TestCase):
33
34    def test_wheel_event(self):
35        # Fake widget class containing `yview` only.
36        class _Widget:
37            def __init__(widget, *expected):
38                widget.expected = expected
39            def yview(widget, *args):
40                self.assertTupleEqual(widget.expected, args)
41        # Fake event class
42        class _Event:
43            pass
44        #        (type, delta, num, amount)
45        tests = ((EventType.MouseWheel, 120, -1, -5),
46                 (EventType.MouseWheel, -120, -1, 5),
47                 (EventType.ButtonPress, -1, 4, -5),
48                 (EventType.ButtonPress, -1, 5, 5))
49
50        event = _Event()
51        for ty, delta, num, amount in tests:
52            event.type = ty
53            event.delta = delta
54            event.num = num
55            res = tree.wheel_event(event, _Widget(SCROLL, amount, "units"))
56            self.assertEqual(res, "break")
57
58
59if __name__ == '__main__':
60    unittest.main(verbosity=2)
61