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+# Docker Container
+
+## Concept
+
+A Docker Container (or Docker Compose configuration) designed to test WordPress themes and plugins, especially under different combinations and/or configurations.
+
+### Examples
+
+This might be used to test a single WordPress plugin across multiple versions of WordPress + PHP:
+
+```yaml
+env:
+  - PHP_VERSION=7.4 WP_VERSION=5.3
+  - PHP_VERSION=7.0 WP_VERSION=4.9
+```
+
+It may also be used to test certain combinations of plugins:
+
+```yaml
+env:
+  - WP_PLUGINS=jetpack@latest,woocommerce@3.7
+```
+
+## Implementation
+
+[WordPress 5.3 introduced the WordPress Local Environment](https://make.wordpress.org/core/2019/08/05/wordpress-local-environment/), [a series of semi-official Docker containers](https://hub.docker.com/u/wordpressdevelop) made to test WordPress core across different versions of PHP.
+
+We can extend these containers (which use Docker Compose) to build environments that, for example, pre-load test data, install + activate plugins, and more.
+
+Better yet, we can make it possible for developers to run specific combinations locally rather than relying that everything go through docker.
+
+Ideally, this would be handled through a script that will set up the necessary environment, along the lines of:
+
+```sh
+$ setup-wp-environment --php=7.3 --wp=trunk --plugin=jetpack --plugin=caldera-forms
+$ phpunit
+```
+
+## Resources
+
+* https://git.saturdaydrive.io/_/engineering-ops/boilerplate/wordpress-plugin
+* https://github.com/assertwell/wp-docker-container