[Maint] force matlab to use non-interactive backend so that tests run in CI environment as well.

Author: RDoerfel

test/test_figures.py

@@ -13,6 +13,9 @@
 from plotting import figures
 from plotting.constants import CM2INCH
 
+# Ensure matplotlib does not try to use an interactive backend (necessary for CI environments)
+mpl.use("Agg")
+
 
 class TestSetRcParams:
     """Test suite for set_rc_params function."""