TST: pass force to mpl.use

tacaswell · tacaswell · commit b2087dd0225c · 2018-08-06T23:45:01.000-04:00
To actually make it change backends.  This change is required because
I reverted some of the more aggressive changes to `mpl.use` (to
effectively default to force=True).
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
@@ -74,7 +74,7 @@ def _get_testable_interactive_backends():
             mpl.use("tkagg")
 
     def check_alt_backend(alt_backend):
-        mpl.use(alt_backend)
+        mpl.use(alt_backend, force=True)
         fig = plt.figure()
         assert_equal(
             type(fig.canvas).__module__,
@@ -84,7 +84,7 @@ def check_alt_backend(alt_backend):
         check_alt_backend(backend[:-3] + "cairo")
     check_alt_backend("svg")
 
-mpl.use(backend)
+mpl.use(backend, force=True)
 
 fig, ax = plt.subplots()
 assert_equal(
