bpo-45229: Make tkinter tests discoverable (pythonGH-28637)

(cherry picked from commit f59ed3c)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Lib/test/test_tk.py

@@ -6,11 +6,9 @@
 # Skip test if tk cannot be initialized.
 support.requires('gui')
 
-from tkinter.test import runtktests
+def load_tests(loader, tests, pattern):
+    return loader.discover('tkinter.test.test_tkinter')
 
-def test_main():
-    support.run_unittest(
-            *runtktests.get_tests(text=False, packages=['test_tkinter']))
 
 if __name__ == '__main__':
-    test_main()
+    unittest.main()

Lib/test/test_ttk_guionly.py

@@ -11,25 +11,26 @@
 import tkinter
 from _tkinter import TclError
 from tkinter import ttk
-from tkinter.test import runtktests
-
-root = None
-try:
-    root = tkinter.Tk()
-    button = ttk.Button(root)
-    button.destroy()
-    del button
-except TclError as msg:
-    # assuming ttk is not available
-    raise unittest.SkipTest("ttk not available: %s" % msg)
-finally:
-    if root is not None:
-        root.destroy()
-    del root
-
-def test_main():
-    support.run_unittest(
-            *runtktests.get_tests(text=False, packages=['test_ttk']))
+
+
+def setUpModule():
+    root = None
+    try:
+        root = tkinter.Tk()
+        button = ttk.Button(root)
+        button.destroy()
+        del button
+    except TclError as msg:
+        # assuming ttk is not available
+        raise unittest.SkipTest("ttk not available: %s" % msg)
+    finally:
+        if root is not None:
+            root.destroy()
+        del root
+
+def load_tests(loader, tests, pattern):
+    return loader.discover('tkinter.test.test_ttk')
+
 
 if __name__ == '__main__':
-    test_main()
+    unittest.main()