This test incorrectly assumes that the root user is always available.
However, in the build environment, the root user is not available.
Note that because the original file distributed in the release on PyPi
has lines ending in CRLF, those are retained in the diff below.

--- a/pyfakefs/tests/fake_filesystem_test.py	1969-12-31 16:00:00.000000000 -0800
+++ b/pyfakefs/tests/fake_filesystem_test.py	1969-12-31 16:00:00.000000000 -0800
@@ -1021,15 +1021,6 @@
             self.assertEqual(self.path.expanduser('~'),
                              self.os.environ['HOME'].replace('/', '!'))
 
-    @unittest.skipIf(TestCase.is_windows or TestCase.is_cygwin,
-                     'only tested on unix systems')
-    def test_expand_root(self):
-        if sys.platform == 'darwin':
-            roothome = '!var!root'
-        else:
-            roothome = '!root'
-        self.assertEqual(self.path.expanduser('~root'), roothome)
-
     def test_getsize_path_nonexistent(self):
         file_path = 'foo!bar!baz'
         self.assertRaises(os.error, self.path.getsize, file_path)
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<div class='path'>path: <a href='/guix/log/?id=89da127035737bdf922bc566970c5506c2e01b00'>root</a>/<a href='/guix/log/gnu?id=89da127035737bdf922bc566970c5506c2e01b00'>gnu</a>/<a href='/guix/log/gnu/packages?id=89da127035737bdf922bc566970c5506c2e01b00'>packages</a>/<a href='/guix/log/gnu/packages/mtools.scm?id=89da127035737bdf922bc566970c5506c2e01b00'>mtools.scm</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/gnu/packages/mtools.scm?id=89da127035737bdf922bc566970c5506c2e01b00&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-04-21 00:51:19 +0200'>2019-04-21</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=1b0b1651b16bd67fa5a583cfe6ce98ac9df80e56'>gnu: mtools: 'mformat' initializes boot sector before writing it.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is the last bit fixing &lt;https://bugs.gnu.org/35283&gt;.

Previously, 'mformat' (used by 'grub-mkrescue') would pass uninitialized
bytes to write(2), leading to non-deterministic FAT image contents.
This patch fixes that.

* gnu/packages/patches/mtools-mformat-uninitialized.patch: New file.
* gnu/packages/mtools.scm (mtools)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-10 10:43:55 +0200'>2018-12-10</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=0ba4a6797603842cadb1232f8741c67dbddf0bff'>gnu: mtools: Update to 4.0.23.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (mtools): Update to 4.0.23.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-12-09 15:43:40 +0200'>2018-12-09</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=ba8c08788fee7b8cad6f0674b842fb0944880cbb'>gnu: mtools: Update to 4.0.22.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (mtools): Update to 4.0.22.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-11-25 18:08:50 +0200'>2018-11-25</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=71cfb437d2997fb50bc6abbe2fdad65fcba6801b'>gnu: mtools: Update to 4.0.21.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (mtools): Update to 4.0.21.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-11-14 21:05:30 +0100'>2018-11-14</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=24dd6ec38ae6b54d4b9dc91fc2fe1119816a0a90'>gnu: mtools: Update to 4.0.20.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (mtools): Update to 4.0.20.
[source](uri): Change to 'bz2' compressed tarball.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-09-30 13:37:38 +0300'>2018-09-30</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=3b362c8a8366b55a172817d7c347098accd3d56b'>gnu: mtools: Update to 4.0.19.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (mtools): Update to 4.0.19.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-09-18 13:50:09 +0200'>2018-09-18</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=8ecd843df5652f63e9f270159936b504357ef2b4'>gnu: exfat-utils: Update to 1.3.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (exfat-utils): Update to 1.3.0.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-10 23:03:51 +0100'>2018-02-10</span></td><td><a href='/guix/commit/gnu/packages/mtools.scm?id=e98d1d2a647fd7bdccd4cc9c6be040f7283d8fb8'>gnu: exfat-utils: Update to 1.2.8.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mtools.scm (exfat-utils): Update to 1.2.8.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>