bpo-33855: Minimally test all IDLE modules. (GH-7689)

Create a template for minimally testing a tkinter-using module by importing it and instantiating its class(es).  Add a test file for all non-startup IDLE modules.  Edit existing files and update coverage.  This is part 1 of 3, covering the 21 autocomplete to help modules and touching 33 idlelib files.
(cherry picked from commit ee5ef309c7e2daef1248730145408f700732c42e)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

1 files changed, 29 insertions, 0 deletions

diff --git a/Lib/idlelib/idle_test/test_calltip_w.py b/Lib/idlelib/idle_test/test_calltip_w.py
new file mode 100644
index 0000000..03f1e9a
--- /dev/null
+++ b/Lib/idlelib/idle_test/test_calltip_w.py
@@ -0,0 +1,29 @@
+"Test calltip_w, coverage 18%."
+
+from idlelib import calltip_w
+import unittest
+from test.support import requires
+from tkinter import Tk, Text
+
+
+class CallTipTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        cls.root = Tk()
+        cls.root.withdraw()
+        cls.text = Text(cls.root)
+        cls.calltip = calltip_w.CallTip(cls.text)
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.update_idletasks()
+        cls.root.destroy()
+        del cls.text, cls.root
+
+    def test_init(self):
+        self.assertEqual(self.calltip.widget, self.text)
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)