Issue #21916: Added tests for the turtle module.

Patch by ingrid, Gregory Loyse and Jelle Zijlstra.

diff --cc Misc/NEWS
index ce498c633de280281df978ac6f6a6230c9d64a1e,ed09a5d145ce34a479357b57ef57d23ccfc1f43e..5a1d4d56f93340aa13c1ae7c396f5e916aca1a2f
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -1238,9 -538,9 +1238,12 @@@ Documentatio
  Tests
  -----
  
+ - Issue #21916: Added tests for the turtle module.  Patch by ingrid,
+   Gregory Loyse and Jelle Zijlstra.
+ 
 +- Issue #26295: When using "python3 -m test --testdir=TESTDIR", regrtest
 +  doesn't add "test." prefix to test module names.
 +
  - Issue #26523: The multiprocessing thread pool (multiprocessing.dummy.Pool)
    was untested.