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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<h1><code class="docutils literal notranslate">matplotlib.testing</code><a class="headerlink" href="#matplotlib-testing" title="Permalink to this headline">¶</a></h1>

<h2><a class="reference internal" href="#module-matplotlib.testing" title="matplotlib.testing"><code class="xref py py-mod docutils literal notranslate">matplotlib.testing</code></a><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>

Helper functions for testing.

<code class="descclassname">matplotlib.testing.</code><code class="descname">is_called_from_pytest</code>()<a class="reference internal" href="../_modules/matplotlib/testing.html#is_called_from_pytest">[source]</a><a class="headerlink" href="#matplotlib.testing.is_called_from_pytest" title="Permalink to this definition">¶</a></dt>

<dd>[Deprecated] Whether we are in a pytest run.

Notes

Deprecated since version 3.2.

</div>

</dd></dl>

<code class="descclassname">matplotlib.testing.</code><code class="descname">set_font_settings_for_testing</code>()<a class="reference internal" href="../_modules/matplotlib/testing.html#set_font_settings_for_testing">[source]</a><a class="headerlink" href="#matplotlib.testing.set_font_settings_for_testing" title="Permalink to this definition">¶</a></dt>

<code class="descclassname">matplotlib.testing.</code><code class="descname">set_reproducibility_for_testing</code>()<a class="reference internal" href="../_modules/matplotlib/testing.html#set_reproducibility_for_testing">[source]</a><a class="headerlink" href="#matplotlib.testing.set_reproducibility_for_testing" title="Permalink to this definition">¶</a></dt>

<code class="descclassname">matplotlib.testing.</code><code class="descname">setup</code>()<a class="reference internal" href="../_modules/matplotlib/testing.html#setup">[source]</a><a class="headerlink" href="#matplotlib.testing.setup" title="Permalink to this definition">¶</a></dt>

</div>

<h2><a class="reference internal" href="#module-matplotlib.testing.compare" title="matplotlib.testing.compare"><code class="xref py py-mod docutils literal notranslate">matplotlib.testing.compare</code></a><a class="headerlink" href="#module-matplotlib.testing.compare" title="Permalink to this headline">¶</a></h2>

Utilities for comparing image results.

<code class="descclassname">matplotlib.testing.compare.</code><code class="descname">comparable_formats</code>()<a class="reference internal" href="../_modules/matplotlib/testing/compare.html#comparable_formats">[source]</a><a class="headerlink" href="#matplotlib.testing.compare.comparable_formats" title="Permalink to this definition">¶</a></dt>

<dd>Return the list of file formats that <a class="reference internal" href="#matplotlib.testing.compare.compare_images" title="matplotlib.testing.compare.compare_images"><code class="xref py py-obj docutils literal notranslate">compare_images</code></a> can compare

on this system.

<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">

<dt>list of str</dt><dd>E.g. <code class="docutils literal notranslate">['png', 'pdf', 'svg', 'eps']</code>.

</dd>

</dl>

</td>

</tr>

</tbody>

</table>

</dd></dl>

<code class="descclassname">matplotlib.testing.compare.</code><code class="descname">compare_images</code>(expected, actual, tol, in_decorator=False)<a class="reference internal" href="../_modules/matplotlib/testing/compare.html#compare_images">[source]</a><a class="headerlink" href="#matplotlib.testing.compare.compare_images" title="Permalink to this definition">¶</a></dt>

<dd>Compare two "image" files checking differences within a tolerance.

The two given filenames may point to files which are convertible to

PNG via the <code class="xref py py-obj docutils literal notranslate">converter</code> dictionary. The underlying RMS is calculated

with the <code class="xref py py-obj docutils literal notranslate">calculate_rms</code> function.

<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first docutils">

<dt>expectedstr</dt><dd>The filename of the expected image.

</dd>

<dt>actualstr</dt><dd>The filename of the actual image.

</dd>

<dt>tolfloat</dt><dd>The tolerance (a color value difference, where 255 is the

maximal difference). The test fails if the average pixel

difference is greater than this value.

</dd>

<dt>in_decoratorbool</dt><dd>Determines the output format. If called from image_comparison

decorator, this should be True. (default=False)

</dd>

</dl>

</td>

</tr>

<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><dl class="first last docutils">

<dt>None or dict or str</dt><dd>Return None if the images are equal within the given tolerance.

If the images differ, the return value depends on in_decorator.

If in_decorator is true, a dict with the following entries is

returned:

<li>rms: The RMS of the image difference.</li>

<li>expected: The filename of the expected image.</li>

<li>actual: The filename of the actual image.</li>

<li>diff_image: The filename of the difference image.</li>

<li>tol: The comparison tolerance.</li>

</ul>

Otherwise, a human-readable multi-line string representation of this

information is returned.

</dd>

</dl>

</td>

</tr>

</tbody>

</table>

Examples

<div class="highlight-default notranslate"><div class="highlight"><pre>img1 = "./baseline/plot.png"

img2 = "./output/plot.png"

compare_images(img1, img2, 0.001)

</pre></div>

</div>

</dd></dl>

</div>

<h2><a class="reference internal" href="#module-matplotlib.testing.decorators" title="matplotlib.testing.decorators"><code class="xref py py-mod docutils literal notranslate">matplotlib.testing.decorators</code></a><a class="headerlink" href="#module-matplotlib.testing.decorators" title="Permalink to this headline">¶</a></h2>

class <code class="descclassname">matplotlib.testing.decorators.</code><code class="descname">CleanupTestCase</code>(methodName='runTest')<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#CleanupTestCase">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.CleanupTestCase" title="Permalink to this definition">¶</a></dt>

<dd>Bases: <code class="xref py py-class docutils literal notranslate">unittest.case.TestCase</code>

A wrapper for unittest.TestCase that includes cleanup operations.

Create an instance of the class that will use the named test

method when executed. Raises a ValueError if the instance does

not have a method with the specified name.

classmethod <code class="descname">setUpClass</code>()<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#CleanupTestCase.setUpClass">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.CleanupTestCase.setUpClass" title="Permalink to this definition">¶</a></dt>

<dd>Hook method for setting up class fixture before running tests in the class.

</dd></dl>

classmethod <code class="descname">tearDownClass</code>()<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#CleanupTestCase.tearDownClass">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.CleanupTestCase.tearDownClass" title="Permalink to this definition">¶</a></dt>

<dd>Hook method for deconstructing the class fixture after running all tests in the class.

</dd></dl>

<code class="descclassname">matplotlib.testing.decorators.</code><code class="descname">check_figures_equal</code>(*, extensions='png', 'pdf', 'svg', tol=0)<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#check_figures_equal">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.check_figures_equal" title="Permalink to this definition">¶</a></dt>

<dd>Decorator for test cases that generate and compare two figures.

The decorated function must take two keyword arguments, fig_test

and fig_ref, and draw the test and reference images on them.

After the function returns, the figures are saved and compared.

This decorator should be preferred over <a class="reference internal" href="#matplotlib.testing.decorators.image_comparison" title="matplotlib.testing.decorators.image_comparison"><code class="xref py py-obj docutils literal notranslate">image_comparison</code></a> when possible in

order to keep the size of the test suite from ballooning.

<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">

<dt>extensionslist, default: ["png", "pdf", "svg"]</dt><dd>The extensions to test.

</dd>

<dt>tolfloat</dt><dd>The RMS threshold above which the test is considered failed.

</dd>

</dl>

</td>

</tr>

</tbody>

</table>

Examples

Check that calling <a class="reference internal" href="_as_gen/matplotlib.axes.Axes.plot.html#matplotlib.axes.Axes.plot" title="matplotlib.axes.Axes.plot"><code class="xref py py-obj docutils literal notranslate">Axes.plot</code></a> with a single argument plots it against

<code class="docutils literal notranslate">[0, 1, 2, ...]</code>:

<div class="highlight-default notranslate"><div class="highlight"><pre>@check_figures_equal()

def test_plot(fig_test, fig_ref):

fig_test.subplots().plot([1, 3, 5])

fig_ref.subplots().plot([0, 1, 2], [1, 3, 5])

</pre></div>

</div>

</dd></dl>

<code class="descclassname">matplotlib.testing.decorators.</code><code class="descname">check_freetype_version</code>(ver)<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#check_freetype_version">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.check_freetype_version" title="Permalink to this definition">¶</a></dt>

<code class="descclassname">matplotlib.testing.decorators.</code><code class="descname">cleanup</code>(style=None)<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#cleanup">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.cleanup" title="Permalink to this definition">¶</a></dt>

<dd>A decorator to ensure that any global state is reset before

running a test.

<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">

<dt>stylestr, dict, or list, optional</dt><dd>The style(s) to apply. Defaults to <code class="docutils literal notranslate">["classic",

"_classic_test_patch"]</code>.

</dd>

</dl>

</td>

</tr>

</tbody>

</table>

</dd></dl>

<code class="descclassname">matplotlib.testing.decorators.</code><code class="descname">image_comparison</code>(baseline_images, extensions=None, tol=0, freetype_version=None, remove_text=False, savefig_kwarg=None, style='classic', '_classic_test_patch')<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#image_comparison">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.image_comparison" title="Permalink to this definition">¶</a></dt>

<dd>Compare images generated by the test with those specified in

baseline_images, which must correspond, else an <code class="xref py py-obj docutils literal notranslate">ImageComparisonFailure</code>

exception will be raised.

<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><dl class="first last docutils">

<dt>baseline_imageslist or None</dt><dd>A list of strings specifying the names of the images generated by

calls to <a class="reference internal" href="_as_gen/matplotlib.figure.Figure.html#matplotlib.figure.Figure.savefig" title="matplotlib.figure.Figure.savefig"><code class="xref py py-obj docutils literal notranslate">Figure.savefig</code></a>.

If None, the test function must use the <code class="docutils literal notranslate">baseline_images</code> fixture,

either as a parameter or with <a class="reference external" href="https://pytest.org/en/stable/reference.html#pytest.mark.usefixtures" title="(in pytest v6.0.1)"><code class="xref py py-obj docutils literal notranslate">pytest.mark.usefixtures</code></a>. This value is

only allowed when using pytest.

</dd>

<dt>extensionsNone or list of str</dt><dd>The list of extensions to test, e.g. <code class="docutils literal notranslate">['png', 'pdf']</code>.

If None, defaults to all supported extensions: png, pdf, and svg.

When testing a single extension, it can be directly included in the

names passed to baseline_images. In that case, extensions must not

be set.

In order to keep the size of the test suite from ballooning, we only

include the <code class="docutils literal notranslate">svg</code> or <code class="docutils literal notranslate">pdf</code> outputs if the test is explicitly

exercising a feature dependent on that backend (see also the

<a class="reference internal" href="#matplotlib.testing.decorators.check_figures_equal" title="matplotlib.testing.decorators.check_figures_equal"><code class="xref py py-obj docutils literal notranslate">check_figures_equal</code></a> decorator for that purpose).

</dd>

<dt>tolfloat, default: 0</dt><dd>The RMS threshold above which the test is considered failed.

Due to expected small differences in floating-point calculations, on

32-bit systems an additional 0.06 is added to this threshold.

</dd>

<dt>freetype_versionstr or tuple</dt><dd>The expected freetype version or range of versions for this test to

pass.

</dd>

<dt>remove_textbool</dt><dd>Remove the title and tick text from the figure before comparison. This

is useful to make the baseline images independent of variations in text

rendering between different versions of FreeType.

This does not remove other, more deliberate, text, such as legends and

annotations.

</dd>

<dt>savefig_kwargdict</dt><dd>Optional arguments that are passed to the savefig method.

</dd>

<dt>stylestr, dict, or list</dt><dd>The optional style(s) to apply to the image test. The test itself

can also apply additional styles if desired. Defaults to <code class="docutils literal notranslate">["classic",

"_classic_test_patch"]</code>.

</dd>

</dl>

</td>

</tr>

</tbody>

</table>

</dd></dl>

<code class="descclassname">matplotlib.testing.decorators.</code><code class="descname">remove_ticks_and_titles</code>(figure)<a class="reference internal" href="../_modules/matplotlib/testing/decorators.html#remove_ticks_and_titles">[source]</a><a class="headerlink" href="#matplotlib.testing.decorators.remove_ticks_and_titles" title="Permalink to this definition">¶</a></dt>

</div>

<h2><a class="reference internal" href="#module-matplotlib.testing.exceptions" title="matplotlib.testing.exceptions"><code class="xref py py-mod docutils literal notranslate">matplotlib.testing.exceptions</code></a><a class="headerlink" href="#module-matplotlib.testing.exceptions" title="Permalink to this headline">¶</a></h2>

exception <code class="descclassname">matplotlib.testing.exceptions.</code><code class="descname">ImageComparisonFailure</code><a class="reference internal" href="../_modules/matplotlib/testing/exceptions.html#ImageComparisonFailure">[source]</a><a class="headerlink" href="#matplotlib.testing.exceptions.ImageComparisonFailure" title="Permalink to this definition">¶</a></dt>

<dd>Bases: <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#AssertionError" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate">AssertionError</code></a>

Raise this exception to mark a test as a comparison between two images.

</dd></dl>

</div>

</div>

Last updated on Aug 14, 2020.

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