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><th>author</th><td>Marius Bakke &lt;mbakke@fastmail.com&gt;</td><td class='right'>2017-11-19 13:19:14 +0100</td></tr>
<tr><th>committer</th><td>Marius Bakke &lt;mbakke@fastmail.com&gt;</td><td class='right'>2017-11-19 13:19:14 +0100</td></tr>
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<div class='commit-subject'>gnu: nss, nss-certs: Update to 3.34.</div><div class='commit-msg'>* gnu/packages/certs.scm (nss-certs): Update to 3.34.
* gnu/packages/gnuzilla.scm (nss): Update to 3.34.
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