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='2018-12-12 20:49:13 +0100'>2018-12-12</span></td><td><a href='/guix/commit/gnu/packages/nettle.scm?id=2a60f9eb3e2b75c4ae6b79d859f7303c2f06b682'>gnu: nettle: Update to 3.4.1.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
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