Adding some laravel specific tests

Author: codebyray

.travis.yml

@@ -7,12 +7,21 @@ php:
   - '7.3'
   - '8.0'
   - '8.1'
-  
+
+env:  
+  - LARAVEL_VERSION=6.*  
+  - LARAVEL_VERSION=7.*
+  - LARAVEL_VERSION=8.*
+  - LARAVEL_VERSION=9.*
+
+matrix:
+  fast_finish: true
+
 before_script:
-  - composer self-update
-  - composer install --no-interaction
-  - pear install pear/PHP_CodeSniffer
-  - phpenv rehash
+  - travis_retry composer self-update
+  - travis_retry composer install --prefer-source --no-interaction
+  - if [ "$LARAVEL_VERSION" != "" ]; then composer require --dev "laravel/laravel:${LARAVEL_VERSION}" --no-update; fi;  
+  - composer update
 
 script:
   - vendor/bin/phpunit --coverage-text