From baf342a6aa31b54b544db87e30f518303a53f5b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C3=ABl=20Defferrard?= <michael.defferrard@epfl.ch>
Date: Fri, 28 Dec 2018 19:37:56 +0100
Subject: [PATCH] test: use matplotlib agg backend

Fix the RecursionError with Python 3.6 when creating many matplotlib
figures.
---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 9ad14c09..d49ae68e 100644
--- 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