Bug summary

We use the check_figures_equal in testing to compare figures. This decorator uses two figure instances fig_test and fig_ref for comparison. If we set any figure properties (like facecolor) in the test, they don't seem to be propagated when saving the actual figure.

Ran into this while writing a test for #24816 (cc @anntzer, for reference)

Code for reproduction

@check_figures_equal(extensions=["png"])
def test_test(fig_test, fig_ref):
    ax_test = fig_test.add_subplot()
    ax_test.set(xticks=[], yticks=[])
    fig_test.set_facecolor("teal")

    ax_ref = fig_ref.add_subplot()
    ax_ref.set(xticks=[], yticks=[])
    fig_ref.set_facecolor("none")

Actual outcome

This test passes, which suggests that the two figures created are equal but they actually aren't since the facecolor for both figures are set to be different.

Expected outcome

This test shouldn't pass and the figures should have facecolors "teal" and "none" respectively.

Additional information

No response

Operating system

Arch

Matplotlib Version

3.6.0.dev1889+gc59a7fa8db.d20230103

Matplotlib Backend

No response

Python version

3.10

Jupyter version

No response

Installation

None