Closed
Description
Bug report
Bug summary
The example of the testing decorator does not work.
https://matplotlib.org/3.2.1/devel/testing.html#writing-an-image-comparison-test
Code for reproduction
from matplotlib.testing.decorators import image_comparison
import matplotlib.pyplot as plt
@image_comparison(baseline_images=['line_dashes'], remove_text=True,
extensions=['png'])
def test_line_dashes():
fig, ax = plt.subplots()
ax.plot(range(10), linestyle=(0, (3, 3)), lw=5)pytest
Actual outcome
=================================== test session starts ===================================
platform linux -- Python 3.7.6, pytest-5.4.3, py-1.8.2, pluggy-0.13.1
rootdir: /home/smirnov/langlearn/mpltest
plugins: openfiles-0.5.0, astropy-header-0.1.2, arraydiff-0.3, hypothesis-5.16.1, remotedata-0.3.2, doctestplus-0.7.0
collected 0 items / 1 error
========================================= ERRORS ==========================================
______________________________ ERROR collecting test_mpl.py _______________________________
In test_line_dashes: function uses no argument 'extension'
==================================== warnings summary =====================================
/home/smirnov/anaconda3/lib/python3.7/site-packages/matplotlib/testing/decorators.py:242
/home/smirnov/anaconda3/lib/python3.7/site-packages/matplotlib/testing/decorators.py:242: PytestUnknownMarkWarning: Unknown pytest.mark.baseline_images - is this a typo? You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html
@pytest.mark.baseline_images(baseline_images)
/home/smirnov/anaconda3/lib/python3.7/site-packages/matplotlib/testing/decorators.py:244
/home/smirnov/anaconda3/lib/python3.7/site-packages/matplotlib/testing/decorators.py:244: PytestUnknownMarkWarning: Unknown pytest.mark.style - is this a typo? You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html
@pytest.mark.style(style)
-- Docs: https://docs.pytest.org/en/latest/warnings.html
================================= short test summary info =================================
ERROR test_mpl.py
!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!
============================== 2 warnings, 1 error in 0.39s ===============================
Expected outcome
Matplotlib version
- Operating system: Windows 10 (native and WSL2)
- Matplotlib version: 3.1.3
- Matplotlib backend (
print(matplotlib.get_backend())): not applicable - Python version: Python 3.7.7 (default, May 6 2020, 11:45:54) [MSC v.1916 64 bit (AMD64)]
- Jupyter version (if applicable): not applicable
- Other libraries: pytest 5.4.3
pip install <package that depends on matplotlib and has it in requirements> within the new Conda environment.
I want to use something to test whether the figures generated by my code look the same/similar comparing to the figures generated earlier.
tekumara and GkAntoniustekumara