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Well, that is annoying. I expected 2.7 failures due to mistakes already corrected, but not with 3.x, and these look to be the latter.
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ERROR: setUpClass (idlelib.idle_test.test_text.TkTextTest)
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Traceback (most recent call last):
 File "/home/buildbot/buildarea/3.x.coghlan-redhat/build/Lib/idlelib/idle_test/test_text.py", line 219, in setUpClass
 cls.root = Tk()
 File "/home/buildbot/buildarea/3.x.coghlan-redhat/build/Lib/tkinter/__init__.py", line 1789, in __init__
 self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable
I do not get this on my system, and I just retried with 
F:\Python\dev\py34\PCbuild>python_d -m test -v -ugui test_idle
and that works.
I did get a test_idle failure running all tests
and a crash with test_marshal in test_bad_reader (test.test_marshal.BugsTestCase)
 so I am rerunning with -v. This claims the problem is
_tkinter.TclError: Can't find a usable init.tcl in the following directories:
This is followed by a list of non-existent directories that omits the one what it actually is and where it is routinely found and it obviously was on the previous run with only test_idle run.
What puzzles me is that both buildbots skipped test_tk and test_ttk_guionly, which suggests that they do not have -ugui, (Nick, one of these is yours) which means they should not have ever called tkinter. On my machine,
 requires('gui') 
works to stop the tkinter test case from running when I omit -ugui.