Try in sh file so 5.2 does not break

.travis.yml

@@ -22,12 +22,6 @@ matrix:
 
 before_script:
   - export PATH="$HOME/.composer/vendor/bin:$PATH"
-  - |
-    if [[ ${TRAVIS_PHP_VERSION:0:2} == "7." ]]; then
-      composer global require "phpunit/phpunit=5.7.*"
-    else
-      composer global require "phpunit/phpunit=4.8.*"
-    fi
   - bash tests/bin/install.sh woocommerce_test root '' localhost $WP_VERSION
   - bash tests/bin/travis.sh before
 

tests/bin/travis.sh

@@ -9,6 +9,12 @@ if [ $1 == 'before' ]; then
 	# No Xdebug and therefore no coverage in PHP 5.3
 	[[ ${TRAVIS_PHP_VERSION} == '5.3' ]] && exit;
 
+	if [[ ${TRAVIS_PHP_VERSION:0:2} == "7." ]]; then
+		composer global require "phpunit/phpunit=5.7.*"
+	else
+		composer global require "phpunit/phpunit=4.8.*"
+	fi
+
 	composer self-update
 	composer install --no-interaction