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Pytest-pyvista package

Project description

PyPI version Python versions See Build Status on AppVeyor

Plugin to test PyVista plot outputs.

This pytest plugin was generated with Cookiecutter along with @hackebrot’s cookiecutter-pytest-plugin template.


This plugin facilitates the comparison of the images produced by PyVista. It generates a cache of images from the tests, using the PyVista plotting function in its first execution. Then, further executions will compare its results against this cache, so if there are any changes in the code that break the image generation, the comparison against the cache will notice it. Note that there is an error tolerance in the comparison, so minor differences won’t fail.


You must have a Python version greater than 3.7, as well as PyVista installed in your environment.


You can install “pytest-pyvista” via pip from PyPI:

$ pip install pytest-pyvista


Once installed, you only need to use the command in your test. The plugin will automatically manage the cache generation if it does not exist, and the image comparison itself. Make sure you enable pv.OFF_SCREEN when loading PyVista, so the doesn’t pop up any window while testing:

import pyvista as pv
pv.OFF_SCREEN = True
def test_succeeds():
    pl = pyvista.Plotter()
    pl.add_mesh(pyvista.Sphere(), show_edges=True)

If you need to use any flag inside the tests, you need to use the verify_image_cache fixture as a parameter to the test:

import pyvista as pv
pv.OFF_SCREEN = True
def test_succeeds(verify_image_cache):
    verify_image_cache.windows_skip_image_cache = True
    pl = pyvista.Plotter()
    pl.add_mesh(pyvista.Sphere(), show_edges=True)

Global flags

These are the flags you can use when calling pytest in the command line:

  • --reset_image_cache creates a new image for each test in tests/plotting/ and is not recommended except for testing or for potentially a major or minor release.

  • You can use --ignore_image_cache if you are running on Linux and want to temporarily ignore regression testing. Realize that regression testing will still occur on our CI testing.

  • When using --fail_extra_image_cache if there is an extra image in the cache, it will report as an error.

Test specific flags

These are attributes of verify_image_cache. You can set them as True if needed in the beginning of your test function.

  • high_variance_tests: If necessary, the threshold for determining if a test will pass or not is incremented to another predetermined threshold. This is currently done due to the use of an unstable version of VTK, in stable versions this shouldn’t be necessary.

  • windows_skip_image_cache: For test where the plotting in Windows is different from MacOS/Linux.

  • macos_skip_image_cache: For test where the plotting in MacOS is different from Windows/Linux.

  • skip: If you have a test that plots a figure, but you don’t want to compare its output against the cache, you can skip it with this flag.


Contributions are always welcome. Tests can be run with tox, please ensure the coverage at least stays the same before you submit a pull request.


Distributed under the terms of the MIT license, pytest-pyvista is free and open source software.


If you encounter any problems, please file an issue along with a detailed description.

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