Fix test related to matplotlib bug

4 jobs for fixtests in 13 minutes and 59 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #142932
docker
build_linux_27

00:13:58

84.0%
passed #142933
docker
build_linux_36

00:13:59

84.0%
passed #142934
macosx
build_macosx_27

00:09:43

84.0%
passed #142935
macosx
build_macosx_36

00:08:03

84.0%