Merge commit 'd435f549fe9bbfbea64ed9be36104e7a23f9603c' as 'libraries/action-scheduler'

libraries/action-scheduler/tests/README.md

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+# Action Scheduler tests
+
+To run unit tests:
+
+1. Make sure that PHPUnit is installed by running:
+    ```
+    $ composer install
+    ```
+
+2. Install WordPress and the WP Unit Test lib using the `install.sh` script:
+    ```
+    $ tests/bin/install.sh <db-name> <db-user> <db-password> [db-host] [wp-version] [skip-database-creation]
+    ```
+
+You may need to quote strings with backslashes to prevent them from being processed by the shell or other programs.
+
+Then, to run the tests:
+    ```
+    $ composer run test
+    ```