Useless PHP unit tests for multisites?

[IanDelMar]

The Travis contains a WP_MULTISITE=1 variable for both the matrix environment variables and the include environment variables.

wp-bootstrap-navwalker/.travis.yml

Lines 15 to 17 in c856e94

	env:
	- WP_VERSION=latest WP_MULTISITE=0 PHPUNIT_VERSION="^5.7"
	- WP_VERSION=latest WP_MULTISITE=1 PHPUNIT_VERSION="^5.7"

wp-bootstrap-navwalker/.travis.yml

Lines 28 to 31 in c856e94

	- php: 7.0
	dist: xenial
	env:
	- WP_VERSION=latest WP_MULTISITE=1 PHPUNIT_VERSION="^5.7"

While the other variables, WP_VERSION and PHPUNIT_VERSION, are used, I don't see that WP_MULTISITE is used anywhere.

wp-bootstrap-navwalker/.travis.yml

Lines 65 to 67 in c856e94

	install:
	- bin/install-wp-tests.sh wordpress_test root "" localhost "${WP_VERSION}"
	- composer global require --dev "phpunit/phpunit=${PHPUNIT_VERSION}"

Additionally, the test file does not include any multisite tests. I think that all unit test with WP_MULTISITE=1 are duplicates of their WP_MULTISITE=0 versions and should be removed as they increase Travis build times and unnecessarily use Travis resources.