This is How to Run PHPUnit Tests for WordPress in Docker (Inherit from Final Class)
As a WordPress developer, writing automated tests is crucial to ensure the reliability and stability of your codebase. However, setting up a testing environment for WordPress can be challenging, especially when dealing with version compatibility issues. In this article, we'll explore how to run PHPUnit tests for WordPress in a Docker environment, focusing on resolving the specific issue of inheriting from a final
class.
The Problem: Inheriting from a final
Class in WordPress Tests
When running PHPUnit tests for WordPress, you may encounter a problem where your test classes are unable to extend from certain WordPress core classes due to the final
keyword. This issue arises because the WordPress core developers have marked some classes as final
, which prevents them from being extended.
In my case, I was using PHPUnit 7.0.3 and PHP 7.1.6, and I encountered this problem when trying to test using the WordPress core test framework. The error message I received was similar to the following:
Class Acme\MyTest extends WP_UnitTestCase but 'WP_UnitTestCase' is marked as final
This error occurred because the WP_UnitTestCase
class in the WordPress core is marked as final
, which means it cannot be extended by my custom test class.
The Solution: Switching to PHPUnit 6.1.0 and PHP 7.0.20
To resolve this issue, I decided to switch to an earlier version of PHPUnit (6.1.0) and an earlier version of PHP (7.0.20). This combination allowed me to successfully run my WordPress tests without any issues related to inheriting from final
classes.
Here's how I set up the testing environment:
-
Docker Setup: I created a Docker environment with the following configuration:
- PHP: 7.0.20
- PHPUnit: 6.1.0
Here's an example Dockerfile
that sets up the environment:
FROM php:7.0.20-apache
# Install required dependencies
RUN apt-get update && apt-get install -y \
git \
zip \
unzip \
libicu-dev \
libonig-dev \
libxml2-dev \
libpng-dev \
libjpeg-dev \
libfreetype6-dev \
&& docker-php-ext-install \
intl \
mbstring \
pdo_mysql \
xml \
gd
# Install Composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
# Install PHPUnit
RUN composer global require "phpunit/phpunit:6.1.0"
ENV PATH="/root/.composer/vendor/bin:${PATH}"
-
WordPress Setup: I set up a WordPress installation within the Docker container, following the standard WordPress installation process.
-
PHPUnit Configuration: I created a phpunit.xml
file in the root of my WordPress project with the following configuration:
<?xml version="1.0" encoding="UTF-8"?>
<phpunit
bootstrap="tests/bootstrap.php"
backupGlobals="false"
colors="true"
convertErrorsToExceptions="true"
convertNoticesToExceptions="true"
convertWarningsToExceptions="true"
processIsolation="false"
stopOnFailure="false"
syntaxCheck="false"
>
<testsuites>
<testsuite name="WordPress Tests">
<directory prefix="test-" suffix=".php">./tests/</directory>
</testsuite>
</testsuites>
</phpunit>
In this configuration, the bootstrap.php
file is responsible for setting up the testing environment and loading the necessary WordPress components.
-
Writing Tests: I created my test classes in the tests/
directory, ensuring that they extended the appropriate WordPress core test classes (e.g., WP_UnitTestCase
) without any issues.
With this setup, I was able to run my WordPress tests using the following command within the Docker container:
phpunit
The tests executed successfully, and I no longer encountered any issues related to inheriting from final
classes.
Benefits of Running WordPress Tests in Docker
Running your WordPress tests in a Docker environment offers several benefits:
-
Consistent Environment: Docker ensures that your testing environment is consistent across different development machines, preventing issues caused by variations in system configurations.
-
Isolation: By running your tests in a Docker container, you can isolate your WordPress installation and its dependencies, preventing conflicts with other projects or system-level packages.
-
Reproducibility: Docker provides a standardized way to build and deploy your testing environment, making it easier to reproduce issues and share your setup with other developers.
-
Easy Scaling: If your test suite grows in size or complexity, Docker makes it straightforward to scale your testing infrastructure by spinning up additional containers.
-
Simplified Dependency Management: With Docker, you can manage and install all the required dependencies (e.g., PHP, WordPress, PHPUnit) within the container, simplifying the setup process.
Conclusion
In this article, we've explored how to run PHPUnit tests for WordPress in a Docker environment, specifically focusing on the issue of inheriting from final
classes. By switching to an earlier version of PHPUnit and PHP, I was able to resolve the compatibility problem and successfully execute my WordPress tests.
Running your WordPress tests in a Docker environment offers numerous benefits, including consistency, isolation, reproducibility, and simplified dependency management. If you're a WordPress developer looking to improve your testing workflow, I encourage you to explore this approach and see how it can benefit your project.
For more information on setting up a WordPress development environment with Docker, you can visit the Flowpoint.ai website, which provides comprehensive guides and resources on web analytics, user behavior analysis, and technical optimization for WordPress sites
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