# CI

## Plotting tests

A frequent frustration in testing is the reproducibility of the plots and `matplotlib`'s behaviour in different environments.
We have some tooling to help with this.

### Viewing plots from failed tests on Azure pipelines

The fixtures `check_same_image` and `image_comparer` upload plots from failing tests so you can view them from the azure pipelines test viewer.
To find these, navigate to the tests tab for your build

```{image} ../_static/img/ci_plot-view_tests-tab.png
:width: 750px
```

Select your failing test

```{image} ../_static/img/ci_plot-view_select-test.png
:width: 750px
```

And open the attachments tab

```{image} ../_static/img/ci_plot-view_attachment-tab.png
:width: 750px
```

From here you can view and download the images which were compared, as well as a diff between them.

### Misc

{func}`matplotlib.testing.setup` tries to establish a consistent environment for creating plots. Make sure it's active!