Tests: set matplotlib backend locally too #2326
Merged
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The default matplotlib backend is interactive. In CI, this results in the tests hanging. Locally, this can result in the terminal losing focus. In CI, we worked around this by setting the
MPLBACKEND
environment variable. However, this doesn't solve the problem locally. This PR usesmatplotlib.use
instead, and works both locally and in CI.Reference: https://matplotlib.org/stable/users/explain/figure/backends.html