Use recommended travis configuration (#9)

* Use recommended travis configuration

* Add PHP 7.3 and nightly PHP version to travis

.travis.yml

@@ -1,24 +1,66 @@
 language: php
+sudo: false
+cache:
+    directories:
+        - $HOME/.composer/cache/files
+        - $HOME/symfony-bridge/.phpunit
+
+env:
+    global:
+        - PHPUNIT_FLAGS="-v"
+        - SYMFONY_PHPUNIT_DIR="$HOME/symfony-bridge/.phpunit"
 
 matrix:
-  fast_finish: true
-  include:
-    - php: 5.6
-      env: COMPOSER_FLAGS="--prefer-lowest"
-    - php: 5.6
-    - php: 7.0
-    - php: 7.1
-    - php: 7.2
-    - php: 7.3
-    - php: hhvm
-    - php: nightly
-  allow_failures:
-    - php: hhvm
-    - php: nightly
+    fast_finish: true
+    include:
+          # Minimum supported dependencies with the latest and oldest PHP version
+        - php: 7.3
+          env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" SYMFONY_DEPRECATIONS_HELPER="weak_vendors"
+        - php: 5.6
+          env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" SYMFONY_DEPRECATIONS_HELPER="weak_vendors"
+
+          # Test the latest stable release
+        - php: 5.6
+        - php: 7.0
+        - php: 7.1
+        - php: 7.2
+        - php: 7.3
+          env: COVERAGE=true PHPUNIT_FLAGS="-v --coverage-text"
+
+          # Test LTS versions. This makes sure we do not use Symfony packages with version greater
+          # than 2 or 3 respectively. Read more at https://github.com/symfony/lts
+        - php: 7.3
+          env: DEPENDENCIES="symfony/lts:^2"
+        - php: 7.3
+          env: DEPENDENCIES="symfony/lts:^3"
+
+          # Latest commit to master
+        - php: 7.3
+          env: STABILITY="dev"
+        - php: nightly
+          env: STABILITY="dev"
+
+    allow_failures:
+          # Dev-master is allowed to fail.
+        - env: STABILITY="dev"
+
+before_install:
+    - if [[ $COVERAGE != true ]]; then phpenv config-rm xdebug.ini || true; fi
+    - if ! [ -z "$STABILITY" ]; then composer config minimum-stability ${STABILITY}; fi;
+    - if ! [ -v "$DEPENDENCIES" ]; then composer require --no-update ${DEPENDENCIES}; fi;
 
 install:
-  - composer update --prefer-dist --no-interaction $COMPOSER_FLAGS
-script: vendor/bin/phpunit --coverage-clover=coverage.clover
+    # To be removed when this issue will be resolved: https://github.com/composer/composer/issues/5355
+    - if [[ "$COMPOSER_FLAGS" == *"--prefer-lowest"* ]]; then composer update --prefer-dist --no-interaction --prefer-stable --quiet; fi
+    - composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction
+    - ./vendor/bin/simple-phpunit install
+
+script:
+    - composer validate --strict --no-check-lock
+    # simple-phpunit is the PHPUnit wrapper provided by the PHPUnit Bridge component and
+    # it helps with testing legacy code and deprecations (composer require symfony/phpunit-bridge)
+    - ./vendor/bin/simple-phpunit $PHPUNIT_FLAGS
+
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar
   - php ocular.phar code-coverage:upload --format=php-clover coverage.clover

composer.json

@@ -25,15 +25,15 @@
     "require-dev": {
         "symfony/framework-bundle": "^2.7|^3.2|^4.1",
         "symfony/twig-bundle": "^2.7|^3.2|^4.1",
-        "phpunit/phpunit": "^5"
+        "symfony/phpunit-bridge": "^3.4|^4.1"
     },
     "suggest": {
         "ext-xdebug": "The Xdebug extension is required for the breakpoint to work",
         "symfony/framework-bundle": "The framework bundle to integrate the extension into Symfony",
         "symfony/twig-bundle": "The twig bundle to integrate the extension into Symfony"
     },
     "scripts": {
-        "phpunit": "vendor/bin/phpunit --colors=always",
+        "phpunit": "vendor/bin/simple-phpunit --colors=always",
         "test": [
             "@phpunit"
         ]

tests/BreakpointExtensionTest.php

@@ -12,12 +12,12 @@
 namespace Ajgl\Twig\Extension\Tests;
 
 use Ajgl\Twig\Extension\BreakpointExtension;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 
 /**
  * @author Antonio J. García Lagar <[email protected]>
  */
-class BreakpointExtensionTest extends PHPUnit_Framework_TestCase
+class BreakpointExtensionTest extends TestCase
 {
     /**
      * @var BreakpointExtension

tests/SymfonyBundle/DependencyInjection/AjglBreakpointTwigExtensionExtensionTest.php

@@ -12,13 +12,13 @@
 namespace Ajgl\Twig\Extension\Tests\SymfonyBundle\DependencyInjection;
 
 use Ajgl\Twig\Extension\SymfonyBundle\DependencyInjection\AjglBreakpointTwigExtensionExtension;
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 /**
  * @author Antonio J. García Lagar <[email protected]>
  */
-class AjglBreakpointTwigExtensionExtensionTest extends PHPUnit_Framework_TestCase
+class AjglBreakpointTwigExtensionExtensionTest extends TestCase
 {
     /**
      * @var ContainerBuilder