We now have to have the build systems installed to get any data out of them

regebro · regebro · commit a188dc856b7d · 2025-07-02T12:15:43.000+02:00
So flit_core is needed for testing.
diff --git a/setup.cfg b/setup.cfg
@@ -50,6 +50,7 @@ test =
     pytest
     setuptools>=60
     zest.releaser[recommended]
+    flit_core>=3.4,<4
 
 [options.entry_points]
 console_scripts =
