trying to fix tests

tests/unit/misc/test_crashdialog.py

@@ -81,7 +81,22 @@ class TestParseFatalStacktrace:
         assert (typ, func) == ('', '')
 
 
-@pytest.mark.parametrize('env, expected', [
+class TestCrashDialog:
+
+    """Tests for crashdialog."""
+
+    @classmethod
+    def setup_class(cls):
+        """Clear env."""
+        cls.env = os.environ.copy()
+        os.environ = {}
+
+    @classmethod
+    def teardown_class(cls):
+        """Restore env."""
+        os.environ = cls.env.copy()
+
+    @pytest.mark.parametrize('env, expected', [
         ({'FOO': 'bar'}, ""),
         ({'FOO': 'bar', 'LC_ALL': 'baz'}, "LC_ALL = baz"),
         ({'LC_ALL': 'baz', 'PYTHONFOO': 'fish'}, "LC_ALL = baz\nPYTHONFOO = fish"),
@@ -94,10 +109,9 @@ class TestParseFatalStacktrace:
             "QT_IM_MODULE = fcitx"
         ),
         ({'LANGUAGE': 'foo', 'LANG': 'en_US.UTF-8'}, "LANG = en_US.UTF-8"),
-])
+    ])
-def test_get_environment_vars(monkeypatch, env, expected):
+    def test_get_environment_vars(self, monkeypatch, env, expected):
         """Test for crashdialog._get_environment_vars."""
-    os.environ = {}
         for k, v in env.items():
             monkeypatch.setenv(k, v)
         assert crashdialog._get_environment_vars() == expected