* Use cgr to avoid dependency conflicts

* Update Path to core phpunit6-compat.php

Author: DavidHickman

.travis.yml

@@ -55,12 +55,16 @@ before_script:
   - |
     case "$TRAVIS_PHP_VERSION" in
       5.6|5.5|5.4|5.3)
-        composer global require "phpunit/phpunit:^4"
+        composer global require consolidation/cgr
+        PATH="$(composer config -g home)/vendor/bin:$PATH"
+        cgr "phpunit/phpunit:^4"
         ;;
       5.2)
-        ;;
+      ;;
       *)
-        composer global require "phpunit/phpunit:6"
+        composer global require consolidation/cgr
+        PATH="$(composer config -g home)/vendor/bin:$PATH"
+        cgr "phpunit/phpunit:^6"
         ;;
     esac
   - |

tests/phpunit/bootstrap.php

@@ -31,7 +31,7 @@ function _manually_load_plugin() {
 }
 
 // Core started including their own phpunit6-compat, so we should use that if we can.
-if ( ! file_exists( $test_root . '/includes/phpunit6-compat.php' ) ) {
+if ( ! file_exists( '/tmp/wordpress-tests-lib/includes/phpunit6/compat.php' ) ) {
 	// WordPress versions before 4.8 will be incompatible with newer PHPUnit versions.
 	if ( version_compare( getenv( 'WP_VERSION' ), '4.8', '<' ) && class_exists( 'PHPUnit\Runner\Version' ) ) {
 		require_once dirname( __FILE__ ) . '/phpunit6-compat.php';