Add missing qapp fixtures to tests

See #3723

tests/unit/config/test_configcommands.py

@@ -371,7 +371,8 @@ class TestEdit:
     """Tests for :config-edit."""
 
     pytestmark = pytest.mark.usefixtures('config_tmpdir', 'data_tmpdir',
-                                         'config_stub', 'key_config_stub')
+                                         'config_stub', 'key_config_stub',
+                                         'qapp')
 
     def test_no_source(self, commands, mocker):
         mock = mocker.patch('qutebrowser.config.configcommands.editor.'

tests/unit/misc/test_utilcmds.py

@@ -153,6 +153,6 @@ def tabbed_browser(stubs, win_registry):
     objreg.delete('tabbed-browser', scope='window', window=0)
 
 
-def test_version(tabbed_browser):
+def test_version(tabbed_browser, qapp):
     utilcmds.version(win_id=0)
     assert tabbed_browser.opened_url == QUrl('qute://version')

tests/unit/utils/test_version.py

@@ -963,7 +963,7 @@ def test_version_output(params, stubs, monkeypatch):
     assert version.version() == expected
 
 
-def test_opengl_vendor():
+def test_opengl_vendor(qapp):
     """Simply call version.opengl_vendor() and see if it doesn't crash."""
     pytest.importorskip("PyQt5.QtOpenGL")
     return version.opengl_vendor()