Removed the Requirement to Install Python and NodeJS (Now Bundled with Borealis)

Dependencies/Python/Lib/idlelib/idle_test/test_tree.py

@@ -0,0 +1,60 @@
+"Test tree. coverage 56%."
+
+from idlelib import tree
+import unittest
+from test.support import requires
+requires('gui')
+from tkinter import Tk, EventType, SCROLL
+
+
+class TreeTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        cls.root = Tk()
+        cls.root.withdraw()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+        del cls.root
+
+    def test_init(self):
+        # Start with code slightly adapted from htest.
+        sc = tree.ScrolledCanvas(
+            self.root, bg="white", highlightthickness=0, takefocus=1)
+        sc.frame.pack(expand=1, fill="both", side='left')
+        item = tree.FileTreeItem(tree.ICONDIR)
+        node = tree.TreeNode(sc.canvas, None, item)
+        node.expand()
+
+
+class TestScrollEvent(unittest.TestCase):
+
+    def test_wheel_event(self):
+        # Fake widget class containing `yview` only.
+        class _Widget:
+            def __init__(widget, *expected):
+                widget.expected = expected
+            def yview(widget, *args):
+                self.assertTupleEqual(widget.expected, args)
+        # Fake event class
+        class _Event:
+            pass
+        #        (type, delta, num, amount)
+        tests = ((EventType.MouseWheel, 120, -1, -5),
+                 (EventType.MouseWheel, -120, -1, 5),
+                 (EventType.ButtonPress, -1, 4, -5),
+                 (EventType.ButtonPress, -1, 5, 5))
+
+        event = _Event()
+        for ty, delta, num, amount in tests:
+            event.type = ty
+            event.delta = delta
+            event.num = num
+            res = tree.wheel_event(event, _Widget(SCROLL, amount, "units"))
+            self.assertEqual(res, "break")
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)