The WooCommerce unit tests started failing when running using WP nightly
with the following error:
```
Fatal error: require_once(): Failed opening required '/tmp/wordpress-tests-lib/src//wp-includes/class-phpmailer.php' (include_path='.:/home/travis/.phpenv/versions/7.4.2/share/pear') in /tmp/wordpress-tests-lib/includes/mock-mailer.php on line 2
```
https://travis-ci.org/woocommerce/woocommerce/jobs/646855363#L1955
This was happening because WP changed the syntax of the line where
ABSPATH is defined in the context of the unit tests
(https://core.trac.wordpress.org/changeset/47198/trunk/wp-tests-config-sample.php)
and we rely on this syntax to change ABSPATH when running
`tests/bin/install.sh`.
To fix this problem, this commit updates the sed command used to change
ABSPATH to work when both the old and new syntaxes are used. In the
future we might want to consider a more robust solution to the problem
of updating ABSPATH.
Commit d6bd82865c removed apigen from
WooCommerce core repository as we are moving it to its own repository (https://github.com/woocommerce/woocommerce-api-docs). This
commit removes the apigen from configuration files. In most cases, it is
just removing the apigen directory from the exclude list of things like
PHPCS and Code Climate.
PR https://github.com/woocommerce/woocommerce/pull/23082 made some changes to the Travis configuration and one of those changes broke the PHPCS when running inside Travis with the following error:
```
ERROR: Referenced sniff "WooCommerce-Core" does not exist
```
For example: https://travis-ci.org/woocommerce/woocommerce/jobs/509471213#L659
This problem went unnoticed during the PR review as no PHP file was modified in it and thus there was no file for PHPCS to check.
This commit fixes the error above by installing the Composer package `woocommerce/woocommerce-sniffs` which is the package that provides `WooCommerce-Core` sniffs and which installs `wp-coding-standards/wpcs` as one of its requirements. I couldn't find an easy way to make this work installing `woocommerce/woocommerce-sniffs` globally so that is why this commit also removes the `global` parameter when calling composer.
Christopher Allford
Brent Sessions
Rodrigo Primo
Julia Amosova
Gerhard
Claudio Sanches
Peter Fabian
Ian Jenkins