Remove dependency on .mainConf class variable in tests

tests/test_dialogs/test_dlg_preferences.py

@@ -30,6 +30,7 @@ from PyQt5.QtWidgets import (
     QDialogButtonBox, QDialog, QAction, QFileDialog, QFontDialog
 )
 
+from novelwriter import CONFIG
 from novelwriter.dialogs.quotes import GuiQuoteSelect
 from novelwriter.dialogs.preferences import GuiPreferences
 
@@ -211,7 +212,7 @@ def testDlgPreferences_Main(qtbot, monkeypatch, nwGUI, tstPaths):
     qtbot.mouseClick(nwPrefs.buttonBox.button(QDialogButtonBox.Ok), Qt.LeftButton)
     nwPrefs._doClose()
 
-    assert nwGUI.mainConf.saveConfig()
+    assert CONFIG.saveConfig()
     projFile = tstPaths.cnfDir / "novelwriter.conf"
     testFile = tstPaths.outDir / "guiPreferences_novelwriter.conf"
     compFile = tstPaths.refDir / "guiPreferences_novelwriter.conf"

tests/test_dialogs/test_dlg_projsettings.py

@@ -21,13 +21,14 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 import pytest
 
-from novelwriter.enum import nwItemType
 from tools import C, getGuiItem, buildTestProject
 
 from PyQt5.QtGui import QColor
 from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import QDialog, QAction, QColorDialog
 
+from novelwriter import CONFIG
+from novelwriter.enum import nwItemType
 from novelwriter.dialogs.editlabel import GuiEditLabel
 from novelwriter.dialogs.projsettings import GuiProjectSettings
 
@@ -91,7 +92,7 @@ def testDlgProjSettings_Main(qtbot, monkeypatch, nwGUI, fncPath, projPath, mockR
     # Create new project
     buildTestProject(nwGUI, projPath)
     mockRnd.reset()
-    nwGUI.mainConf.setBackupPath(fncPath)
+    CONFIG.setBackupPath(fncPath)
 
     # Set some values
     theProject = nwGUI.theProject
@@ -156,7 +157,7 @@ def testDlgProjSettings_StatusImport(qtbot, monkeypatch, nwGUI, fncPath, projPat
     # Create new project
     mockRnd.reset()
     buildTestProject(nwGUI, projPath)
-    nwGUI.mainConf.setBackupPath(fncPath)
+    CONFIG.setBackupPath(fncPath)
 
     # Set some values
     theProject = nwGUI.theProject
@@ -357,7 +358,7 @@ def testDlgProjSettings_Replace(qtbot, monkeypatch, nwGUI, fncPath, projPath, mo
     # Create new project
     mockRnd.reset()
     buildTestProject(nwGUI, projPath)
-    nwGUI.mainConf.setBackupPath(fncPath)
+    CONFIG.setBackupPath(fncPath)
 
     # Set some values
     theProject = nwGUI.theProject