Learnings

<p>Page Object Pattern for Your Selenium Tests </p>

<p>How to not use random data with model mommy: #recipes</p>

<p>If you want to mock a class' property method in your tests you should use PropertyMock #unittest.mock.PropertyMock</p>

<p>Difference between shallow, mount and render of Enzyme </p>

<p>Modifying request session on tests </p>

<p>how to test Django migrations </p>

<p>Django testing for beginners </p>

<p>To avoid a FileField with a custom storage using AWS S3 (django-storages) to try authenticating when model is saved you can patch the save method of the instance of the storage. Eg.: <code>python class MyTest(TestCase): @mock.patch('my_app.models.my_s3_boto_storage_instance.save') def test_create_my_model(self, save): pass # test model creation</code></p>

<p>Django test utils to manage file storage side effects: </p>

<p>Solution for slow Django tests with custom localhost domain: #comment81243303_28864152</p>

<p>DRYer Django test code with subtests </p>

<p>Python mutation testing library: </p>

<p>Be careful when comparing <code>Decimal</code> and <code>float</code>: <code>Decimal('3.0') == 3.0</code> but <code>Decimal('3.2') != 3.2</code>.</p>

<p>This is how you mock components when testing react with <code>jest</code>:</p> <p><code>// in your test file jest.mock('../path/to/component/to/Component.js');</code></p> <p>Create a <code>__mocks__</code> folder in the same directory of the component you want to test and a file with the same name of the component inside it:</p> <p><code>// __mocks__/Component.js import React from 'react'; export default function mock() { return (&lt;span&gt;Component mock&lt;/span&gt;); }</code></p>

<p>This is how to pass an argument to a <code>Makefile</code> command:</p> <p><code>ARG := $(word 2, $(MAKECMDGOALS) ) test: python manage.py test $(ARG) --parallel --keepdb</code> Use like this: <code>make test app.tests</code></p>

<p>Testing image upload in Django Rest Framework: </p>

<p>Speed up your Django automated tests with <code>python manage.py test --keepdb --parallel</code></p>

<p>Use <code>jest --runInBand</code> for faster builds and to avoid out of memory errors in [CircleCI](</p>

<p>While developing, do <code>python manage.py --keepdb</code> to speed up your Django tests. This prevents the overhead of creating and destroying a new test DB</p>

<p>Use <code>subTest</code> in Python unittest when asserting inside loop: <a href="#.425k66c9b">#.425k66c9b</a></p>