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After the fix for #20567, running test_idle and then test_ttk_guionly works, but running either after itself does not. Example command and output, which is same running with installed 3.4.0rc1 (Feb 11) or fresh debug build.
F:\Python\dev> 4\py34\pcbuild\python_d.exe -m test -ugui test_ttk_guionly test_ttk_guionly
[1/2] test_ttk_guionly
Warning -- os.environ was modified by test_ttk_guionly
[2/2] test_ttk_guionly
test test_ttk_guionly crashed -- Traceback (most recent call last):
 File "F:\Python\dev4円\py34\lib\test\test_ttk_guionly.py", line 35, in test_main
 *runtktests.get_tests(text=False, packages=['test_ttk']))
 File "F:\Python\dev4円\py34\lib\test\support\__init__.py", line 1719, in run_unittest
 _run_suite(suite)
 File "F:\Python\dev4円\py34\lib\test\support\__init__.py", line 1694, in _run_suite
 raise TestFailed(err)
test.support.TestFailed: multiple errors occurred; run in verbose mode for details
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "F:\Python\dev4円\py34\lib\test\regrtest.py", line 1278, in runtest_inner
 test_runner()
 File "F:\Python\dev4円\py34\lib\test\test_ttk_guionly.py", line 37, in test_main
 get_tk_root().destroy()
 File "F:\Python\dev4円\py34\lib\tkinter\test\support.py", line 60, in get_tk_root
 root = tkinter.Tk()
 File "F:\Python\dev4円\py34\lib\tkinter\__init__.py", line 1807, in __init__
 self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: Can't find a usable init.tcl in the following directories:
 F:/Python/dev/4/py34/lib/tcl8.6 F:/Python/dev/4/py34/lib/tcl8.6 F:/Python/dev/4/lib/tcl8.6 F:/Python/dev/4/py34/library F:/Python/dev/4/library F:/Python/dev/4/tcl8.6.1/library F:/Python/dev/tcl8.6.1/library
init.tcl *is* in 4/tcl8.6.1.0/library and 4/tcltk/tcl8.6/lib. I believe it is usually found in the latter.
This might be Windows only.

The "Warning -- os.environ was modified by test_ttk_guionly" looks suspicious. Does the patch for Issue20035 help?

The #20035 patch removes the warning but the rest is the same.

What happens if you add -v (verbose) "... -m test -v -ugui ..." to find the failing tests?

With 3.3 and the patch still applied, all 13 test methods fail with tracebacks that end with the _tkinter.create call, as above. For Idle, there are 3 tracebacks for the 3 modules with gui tests.

For what it's worth, I don't see the problem on OS X (haven't tried it recently on a Linux system), so it might be a Windows only issue. It's become clearer that some test combinations can only be safely run with the regrtest -j option to run them as separate subprocesses. I Does "-m test -j2 -ugui test_ttk_guionly test_ttk_guionly" help?

Does recent patch for issue20035 help?

From Ned Deily's message.
>>haven't tried it recently on a Linux system
Output from a linux syste:
./python -m test -ugui test_ttk_guionly test_ttk_guionly test_idle test_idle
[1/4] test_ttk_guionly
[2/4] test_ttk_guionly
[3/4] test_idle
[4/4] test_idle
All 4 tests OK.
So it confirms as a windows issue. Unfortunately, that's all I have to offer on this issue ATM.

I have just tested on Windows and all works to me. Terry, can you confirm that this issue is gone?

Either test repeated works now.