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Overview of python unittests and nose, and comparison to popular unittesting frame works in other languages, including perl, php, ruby, java, scala, erlang.
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JUnit 5 is the next generation of JUnit. The goal is to create an up-to-date foundation for developer-side testing on the JVM. This includes focusing on Java 8 and above, as well as enabling many different styles of testing.
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PuppetConf 2016: Turning Pain Into Gain: A Unit Testing Story – Nadeem Ahmad ...Puppet
Here are the slides from Nadeem Ahmad & Jordan Moldow's presentation called Turning Pain Into Gain: A Unit Testing Story. Watch the videos at https://www.youtube.com/playlist?list=PLV86BgbREluVjwwt-9UL8u2Uy8xnzpIqa
Talk was given for the first time at JPrime 2017 conference in Sofia, Bulgaria
JUnit is the standard way to test things in Java. In fact, it is the most commonly included external library for Java projects! Here is another fact - JUnit 4 release was 11 years ago and no feature releases were added in recent years. What you knew about JUnit in 2010 is still 100% relevant today. In 2017...
So finally, time for upgrade!
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For more info about JPrime check out jprime.io
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DIY in 5 Minutes: Testing Django App with Pytest
1. Simplified: How to Test Django App with Pytest in 5 Mins?
As we see companies embracing artificial intelligence (AI), machine learning (ML)
and Data Science, we’ve witnessed a steep rise in the usage of Python language as it
is extensively used in these domains. Django framework, in particular, has become a
silver bullet in the armory of Python Developers. It’s a powerful and flexible toolkit for
developing web APIs, including REST APIs -
As a result of all the features it provides, Django has become a favourite weapon in
developers’ arsenal. Developers look to develop the best applications, they often
underestimate performing unit testing on the developed products.
Having said that, the Python and Django experts understand that unit testing
applications is a crucial step as they help in detection of bugs and improve app’s
performance. That’s why the best Django development companies give utmost
importance. So make sure you consider unit testing as a criteria when hiring a
Django development company.
In this blog post, we’re going to show how you can write a basic unit test using
Pytest for Django applications. Let’s get started!
2. Why Use Pytest?
Pytest is a framework that Django experts rely on heavily. It makes writing small test
codes simple and easier while also scaling and supporting complex functional
testing for applications or libraries. One of the major uses of Pytest is to write test
codes for APIs. Pytest, as the name suggests, writes test codes in the Python
programming language.
Pytest is used by many different developers and companies because it enables
automation - it has its own way to detect tests, run tests, skip an entire subset of
tests and even run multiple tests. Pytest is the best option when the objective is to
reduce the execution time. Some of the major benefits of Pytest are:
- It has a very easy and simple syntax which makes your start effortless and
quick.
- The execution time of the test suite is reduced because of multiple tests being
run parallelly.
- It detects test files and test functions without any explicit mention with
complete automation.
- You can skip an entire subset of tests during the time of execution and also
run an entire subset of tests.
- Pytest has scalable, modular fixtures.
- Pytest is completely open source and free for everyone.
These benefits are some of the major reasons why more and more businesses which
want to scale up and digitize are looking to hire python Django developers.
Especially in 2021, Python’s use in many different directions is ascendant and evident
with more and more companies growing proficient at deploying it.
Some of the most Attractive Features of Pytest
Django provides various easy-to-implement features for developers and Pytest is
one of them. Pytest owes a lot of its popularity amongst the developer community
to the wide variety of features it provides. Pytest enables you to create marks and
custom labels for any code testing of your preference. Pytest fixtures are used for
configuring data, connecting and disconnecting the databases, etc.
3. Setting up Pytest for your Django App
The fixtures that are provided in Django are not ideal for some cases and that is
precisely where Pytest fixtures come in.
Installation of Pytest and Django plug-in
This plug-in is maintained by the Pytest development team and it provides useful
tools for writing test codes for any projects on Django.
Get access to the database from the tests
In order to access the database, you need to start by running a test. Write a test that
will help you check if the function create-user() is setting the username correctly.
Once the test is executed from your command, if it fails, it means you have to inject a
special fixture called DB. This fixture is a part of the Django plug-in and is very
important for accessing databases.
Create and maintain fixtures for the Django Models
Once the access is granted and the username is all set, you need to set a password.
The test will help you in validating your password. You must also mark functions as
4. fixtures to inject more test cases. This way you don’t have to go to every test case
and add it to a group. Using fixtures, just one time examination allows you to add
cases to the group.
Fixtures help you avoid repetition while also making the tests more maintainable -
which is why most python development companies are pivoting to using Django
and Pytest framework.
What is the Process of Django testing with Pytest?
Before we get to the testing part, we need to perform some critical functions. Let’s
go through them first.
Create a Virtual Environment:
We are using Python 3, which has inbuilt support for creating virtual environments.
You need to run the following command to create and activate a virtual
environment:
$ mkdir pytest_project
$ cd pytest_project
$ python3 -m venv pytest-env
Running the above command will create a virtual environment called pytest-env in
the working directory.
Activate Virtual Environment:
We need to activate virtualenv so that we can use it. Here’s the command:
$ source pytest-env/bin/activate
The activation makes sure that all packages will be installed in the virtual
environment, rather than in the global Python installation.
Install Pytest: In order to install Pytest, you will need to install the pip package
manager. Once done, you can install Pytest using following command:
$ pip install pytest
5. Let’s Run a Sample Test
Step 1: Create a new Django project from the terminal
django-admin startproject django_testing .
Step 2: Create a sample Django application
python manage.py startapp main_app
Step 3: Register the app
# settings.py
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'main_app.apps.MainAppConfig' # add this
]
Step 4: Change the templates directory
# settings.py
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join(BASE_DIR, 'templates')], # add this
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
6. Step 5: Run the Application
python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...
System check identified no issues (0 silenced).
You have 17 unapplied migration(s). Your project may not work properly until you
apply the migrations for app(s): admin, auth, contenttypes, sessions.
Run 'python manage.py migrate' to apply them.
December 01, 2021 - 21:15:31
Django version 3.0.5, using settings 'django_testing.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Step 6: Create a pytest file
touch pytest.ini
# pytest.ini
[pytest]
DJANGO_SETTINGS_MODULE = django_testing.settings
# -- recommended but optional:
python_files = tests.py test_*.py *_tests.py
Step 7: Run the test suite
$ pytest
============================= test session starts
==============================
platform linux -- Python 3.7.5, pytest-5.4.1, py-1.8.1, pluggy-0.13.1
rootdir: /home/username/projects/username/source-
code/django_testing_using_pytest, inifile: pytest.ini
plugins: django-3.9.0
collected 0 items
Step 8: Write the test
7. Here’s a test sample that we’ve used. You can write a test that works for you.
# models.py
from django.db import models
class Contact(models.Model):
first_name = models.CharField(max_length=150)
last_name = models.CharField(max_length=150)
phone = models.CharField(max_length=150)
email = models.CharField(max_length=150, blank=True)
created_at = models.DateTimeField(auto_now_add=True)
def __str__(self):
return self.phone
# tests.py
import pytest
from .models import Contact
@pytest.mark.django_db
def test_contact_create():
contact = Contact.objects.create(
first_name="John",
last_name="Doe",
email="john@gmail.com",
phone="00221 70 992 33 43"
)
assert contact.email == "john@gmail.com"
assert contact.phone == "00221 70 992 33 43"
Step 9: Run the Test
pytest
============================= test session starts
=============================
platform linux -- Python 3.7.5, pytest-5.4.1, py-1.8.1, pluggy-0.13.1
django: settings: django_testing.settings (from ini)
rootdir: /home/username/projects/username/source-
code/django_testing_using_pytest, inifile: pytest.ini
8. plugins: django-3.9.0
collected 1 item
main_app/tests.py . [100%]
============================== 1 passed in 0.27s
==============================
As you can see, our test has successfully passed. Easy, wasn’t it? We hope this helped
you. You might need to be a Django expert to develop an app, but not to run a test.
Final Words
The Django framework has been playing a key role when it comes to Python
development. Often Django experts underline the significance of unit testing the
app for complexity but Pytest provides an easy way to do so. No matter where it
ranks on the spectrum of complexity, you no longer need to worry about it.
We, at Inexture, are an award-winning Django development company providing
across the board services. Feel free to get in touch with our experts today!
Original Published by Here’s Your Step by Step Guide to Test Django App with Pytest