Skip tests that fail with newer versions of Python.

Patch copied from Gentoo:

https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-python/unittest2/files/unittest2-1.1.0-python3.5-test.patch

diff --git a/unittest2/test/test_loader.py b/unittest2/test/test_loader.py
index 683f662..347eea5 100644
--- a/unittest2/test/test_loader.py
+++ b/unittest2/test/test_loader.py
@@ -509,6 +509,7 @@ class Test_TestLoader(unittest2.TestCase):
     #
     # What happens when an impossible name is given, relative to the provided
     # `module`?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromName__relative_malformed_name(self):
         loader = unittest.TestLoader()
 
@@ -811,6 +812,7 @@ class Test_TestLoader(unittest2.TestCase):
     # TestCase or TestSuite instance."
     #
     # What happens when presented with an impossible module name?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromNames__malformed_name(self):
         loader = unittest2.TestLoader()
 
@@ -918,6 +920,7 @@ class Test_TestLoader(unittest2.TestCase):
     # "The method optionally resolves name relative to the given module"
     #
     # What happens when presented with an impossible attribute name?
+    @unittest.skipIf(sys.version_info[:2] >= (3, 5), "python 3.5 has problems here")
     def test_loadTestsFromNames__relative_malformed_name(self):
         loader = unittest.TestLoader()
 
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<div class='path'>path: <a href='/guix/log/?id=6d357541021578914eba7bb33d2529a6744de36d'>root</a>/<a href='/guix/log/tests?id=6d357541021578914eba7bb33d2529a6744de36d'>tests</a>/<a href='/guix/log/tests/guix-package.sh?id=6d357541021578914eba7bb33d2529a6744de36d'>guix-package.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-package.sh?id=6d357541021578914eba7bb33d2529a6744de36d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-29 01:22:04 +0200'>2021-04-29</span></td><td><a href='/guix/commit/tests/guix-package.sh?id=524c9800afb433cc474132185d8e37f72004adb3'>diagnostics, ui: Adjust to 'read-error' and 'syntax-error' in Guile 3.0.6.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/diagnostics.scm (source-properties-&gt;location): Add clause for
vectors.
* guix/ui.scm (report-load-error): Tweak 'read-error' handling for 3.0.6.
* tests/guix-package.sh: Relax regexp for the "unbound variable"
diagnostic check.
* tests/guix-system.sh: Adjust "missing closing paren" check for 3.0.6.
* tests/records.scm (location-alist): New procedure.
("define-record-type* &amp; wrong field specifier")
("define-record-type* &amp; wrong field specifier, identifier")
("define-record-type* &amp; duplicate initializers"): Use it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-03-05 12:49:27 +0100'>2021-03-05</span></td><td><a href='/guix/commit/tests/guix-package.sh?id=90ea8b16eb519a88d8f739fea5a416c0b99de19f'>profiles: 'package-&gt;manifest-entry' preserves transformations by default.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously, transformations applied from a manifest (rather than via
"guix install") would be lost.  This change fixes that and simplifies
things.

Reported by zimoun at
&lt;https://lists.gnu.org/archive/html/guix-devel/2021-02/msg00153.html&gt;.

* guix/profiles.scm (default-properties): New procedure.
(package-&gt;manifest-entry): Use it for #:properties.
* guix/scripts/pack.scm (guix-pack)[with-transformations]: Remove.
Remove caller.
* guix/scripts/package.scm (transaction-upgrade-entry): Remove calls to
'manifest-entry-with-transformations'.
* tests/guix-package.sh: Add test.
* tests/transformations.scm ("options-&gt;transformation + package-&gt;manifest-entry"):
New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-02-01 17:32:35 +0100'>2021-02-01</span></td><td><a href='/guix/commit/tests/guix-package.sh?id=9fd7b050e2198c89f0763fe79f5c541b77b8e5c9'>guix package: Add '--export-manifest'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/package.scm (export-manifest): New procedure.
(show-help, %options): Add '--export-manifest'.
(process-query): Honor it.
* guix/build/profiles.scm (build-profile): Mention it.
* tests/guix-package.sh: Test it.
* doc/guix.texi (Invoking guix package): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-02 23:28:09 +0200'>2020-10-02</span></td><td><a href='/guix/commit/tests/guix-package.sh?id=8e1907a72430aa989125b053573ef0897c480697'>guix package: Re-apply package transformation when upgrading.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/package.scm (transaction-upgrade-entry)[upgrade]: Add
'transform' parameter.  Pass PKG through it.  Use
'manifest-entry-with-transformations'.
Call 'options-&gt;transformation' to get the transformation procedure.
* tests/guix-package.sh: Add 'guix package -u' test.
* tests/packages.scm ("transaction-upgrade-entry, transformation options preserved"):
New test.
* doc/guix.texi (Invoking guix package): Mention that transformations
are preserved across upgrades.
(Package Transformation Options): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-02 09:43:05 +0200'>2020-10-02</span></td><td><a href='/guix/commit/tests/guix-package.sh?id=cc346931523a7235a8093ec96f05412d5f2f468d'>tests: Adjust to recent changes to the 'emacs' package.</a><span class='msg-avail'>...<span class='msg-tooltip'>Test regression introduced in f88fea0eaa5796303790450ee4543a6d7e61a06e.

* tests/guix-package.sh: Add minor and patch levels in the version
numbers of 'emacs-foo-bar' and 'emacs-foo-bar-patched'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-28 21:06:36 -0500'>2020-09-28</span></td><td><a href='/guix/commit/tests/guix-package.sh?id=d8934360d2453a403b5433e71d09188e4ed23b57'>tests: Simplify shell exit status negation;</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-lint.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh: Use the shell '!' keyword to negate command exit status
in place of 'if ...; then false; else true; fi'
</span></span></td><td>Eric Bavier</td></tr>