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='2019-06-14 22:09:38 +0200'>2019-06-14</span></td><td><a href='/guix/commit/tests/search-paths.scm?id=92d00ca4661e186022732a47956a2bc0ef16be96'>build: Remove 'gnu/packages/bootstrap' and its binaries.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-04 00:10:00 +0200'>2017-04-04</span></td><td><a href='/guix/commit/tests/search-paths.scm?id=f73bb91ebe8d78f54bb90d2168b353a4f5210f02'>tests: Adjust search-paths test following the introduction of aarch64.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-01-23 22:23:41 +0100'>2017-01-23</span></td><td><a href='/guix/commit/tests/search-paths.scm?id=fcd75bdbfa99d14363b905afbf914eec20e69df8'>search-paths: Allow specs with #f as their separator.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>