Add missing require_dependency
@@ -290,6 +290,7 @@ def test_is_ul(tmp_path):
table = fp.to_table()
assert_allclose(table["is_ul"].data.data, is_ul)
+@requires_dependency("matplotlib")
def test_flux_points_plot_no_error_bar():
table = Table()
pwl = PowerLawSpectralModel()
