test: use matplotlib agg backend

Fix the RecursionError with Python 3.6 when creating many matplotlib figures.
Droxef · Dec 29, 2018 · baf342a · baf342a
1 parent 3714d53
commit baf342a
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/Makefile b/Makefile
@@ -14,7 +14,11 @@ clean:
 lint:
 	flake8 --doctests --exclude=doc
 
-test: export DISPLAY = :99
+# Matplotlib doesn't print to screen. Also faster.
+export MPLBACKEND = agg
+# Virtual framebuffer nonetheless needed for the pyqtgraph backend.
+export DISPLAY = :99
+
 test:
 	Xvfb $$DISPLAY -screen 0 800x600x24 &
 	coverage run --branch --source pygsp setup.py test