tests: switch matplotlib backend in tests

ManonMarchand · ManonMarchand · commit 250e616f2331 · 2024-11-12T14:22:26.000+01:00
diff --git a/conftest.py b/conftest.py
@@ -0,0 +1,5 @@
+import matplotlib as mpl
+
+# chose the matplotlib backend that can only generate pngs
+# but not interact with the os (better for testing)
+mpl.use("Agg")
