diff --git a/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py b/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py index aad42d1f4d72..ef330a027681 100644 --- a/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py +++ b/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py @@ -2124,3 +2124,29 @@ def test_panecolor_rcparams(): 'axes3d.zaxis.panecolor': 'b'}): fig = plt.figure(figsize=(1, 1)) fig.add_subplot(projection='3d') + + +@check_figures_equal(extensions=["png"]) +def test_mutating_input_arrays_y_and_z(fig_test, fig_ref): + """ + Test to see if the `z` axis does not get mutated + after a call to `Axes3D.plot` + + test cases came from GH#8990 + """ + ax1 = fig_test.add_subplot(111, projection='3d') + x = [1, 2, 3] + y = [0.0, 0.0, 0.0] + z = [0.0, 0.0, 0.0] + ax1.plot(x, y, z, 'o-') + + # mutate y,z to get a nontrivial line + y[:] = [1, 2, 3] + z[:] = [1, 2, 3] + + # draw the same plot without mutating x and y + ax2 = fig_ref.add_subplot(111, projection='3d') + x = [1, 2, 3] + y = [0.0, 0.0, 0.0] + z = [0.0, 0.0, 0.0] + ax2.plot(x, y, z, 'o-')
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