More test coverage, remove unused functions from editor.py

tests/test_main_module.py

@@ -0,0 +1,14 @@
+import runpy
+import types
+import sys
+import builtins
+
+def test_dunder_main_executes_without_launching_qt(monkeypatch):
+    # Replace bouquin.main with a stub that records invocation and returns immediately
+    calls = {"called": False}
+    mod = types.SimpleNamespace(main=lambda: calls.__setitem__("called", True))
+    monkeypatch.setitem(sys.modules, "bouquin.main", mod)
+
+    # Running the module as __main__ should call mod.main() but not start a Qt loop
+    runpy.run_module("bouquin.__main__", run_name="__main__")
+    assert calls["called"] is True