fix tests

magicgui/backends/_qtpy/widgets.py

@@ -825,8 +825,10 @@ def _mgui_bind_change_callback(self, callback):
         """Bind callback to event of changing any cell."""
 
         def _item_callback(item, callback=callback):
-            col_head = item.tableWidget().horizontalHeaderItem(item.column()).text()
-            row_head = item.tableWidget().verticalHeaderItem(item.row()).text()
+            col_head = item.tableWidget().horizontalHeaderItem(item.column())
+            col_head = col_head.text() if col_head is not None else ""
+            row_head = item.tableWidget().verticalHeaderItem(item.row())
+            row_head = row_head.text() if row_head is not None else ""
             data = {
                 "data": item.data(self._DATA_ROLE),
                 "row": item.row(),

magicgui/events.py

@@ -661,8 +661,11 @@ def __call__(self, *args, **kwargs) -> Event:
                 self.disconnect(cb)
         finally:
             self._emitting = False
-            if event._pop_source() != self.source:
-                raise RuntimeError("Event source-stack mismatch.")
+            evsource = event._pop_source()
+            if evsource is not self.source:
+                raise RuntimeError(
+                    f"Event source-stack mismatch. ({evsource} is not {self.source}"
+                )
 
         return event
 

tests/conftest.py

@@ -0,0 +1,9 @@
+import pytest
+
+
+# for now, the only backend is qt, and pytest-qt's qapp provides some nice pre-post
+# test cleanup that prevents some segfaults.  Once we start testing multiple backends
+# this will need to change.
+@pytest.fixture(autouse=True, scope="session")
+def always_qapp(qapp):
+    return qapp