Update .travis.yml

.travis.yml

@@ -1,11 +1,39 @@
+cache:
+    directories:
+        - $HOME/.composer/cache
+
 language: php
 
-php:
-  - 7.2
-  - 7.3
+env:
+    global:
+        - COVERAGE=0
+
+matrix:
+    include:
+        - php: 7.2
+          env: LARAVEL='5.8.*' TESTBENCH='3.8.*' COMPOSER_FLAGS='--prefer-lowest'
+        - php: 7.2
+          env: LARAVEL='5.8.*' TESTBENCH='3.8.*' COMPOSER_FLAGS='--prefer-stable'
+        - php: 7.2
+          env: LARAVEL='6.0.*' TESTBENCH='4.0.*' COMPOSER_FLAGS='--prefer-lowest'
+        - php: 7.2
+          env: LARAVEL='6.0.*' TESTBENCH='4.0.*' COMPOSER_FLAGS='--prefer-stable'
+        - php: 7.3
+          env: LARAVEL='5.8.*' TESTBENCH='3.8.*' COMPOSER_FLAGS='--prefer-lowest'
+        - php: 7.3
+          env: LARAVEL='5.8.*' TESTBENCH='3.8.*' COMPOSER_FLAGS='--prefer-stable'
+        - php: 7.3
+          env: LARAVEL='6.0.*' TESTBENCH='4.0.*' COMPOSER_FLAGS='--prefer-lowest'
+        - php: 7.3
+          env: LARAVEL='6.0.*' TESTBENCH='4.0.*' COMPOSER_FLAGS='--prefer-stable'
+    fast_finish: true
 
 before_script:
-  - travis_retry composer self-update
-  - travis_retry composer install --prefer-source --no-interaction --dev
+    - composer config discard-changes true
+
+before_install:
+    - travis_retry composer self-update
+    - travis_retry composer require "laravel/framework:${LARAVEL}" "orchestra/testbench:${TESTBENCH}" --no-interaction --no-update
 
-script: vendor/bin/phpunit
+install:
+    - travis_retry composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction --no-suggest