Retain environment setting of "HOME" for tests that need os.path.expanduser()
to return a readable directory in the build chroot.

--- thefuck-3.25/tests/conftest.py
+++ thefuck-3.25/tests/conftest.py
@@ -64,6 +64,7 @@ def set_shell(monkeypatch):
 
 @pytest.fixture(autouse=True)
 def os_environ(monkeypatch):
-    env = {'PATH': os.environ['PATH']}
+    env = {'PATH': os.environ['PATH'],
+           'HOME': os.environ['HOME']}
     monkeypatch.setattr('os.environ', env)
     return env
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<tr><td><span title='2020-05-20 08:30:35 -0400'>2020-05-20</span></td><td><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=b460ba7992a0b4af2ddb5927dcf062784539ef7b'>bootloader: grub: Allow booting from a Btrfs subvolume.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-01-03 16:06:26 +0100'>2020-01-03</span></td><td><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=9512ba6b09b55c1551933c1885aa1ca39457aea8'>bootloader: Mark "grub.cfg" and "extlinux.conf" as non-substitutable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-16 18:15:13 +0100'>2019-03-16</span></td><td><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=21fcfe1ee969cc477dc41486ae4074e655d44274'>bootloader: Use 'invoke/quiet' when running 'grub-install' and co.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-13 23:12:43 +0100'>2019-03-13</span></td><td><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=59e80445882f8b0379e54916f89510c0deda6698'>Remove traces of "GuixSD".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-18 23:37:44 +0100'>2018-11-18</span></td><td><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=46c296dcc4817f15a4b4ef7e5ef622306b4db62e'>bootloader: De-monadify configuration file generators.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>