improve travis-ci matrix

Author: fbourigault

.travis.yml

@@ -21,38 +21,40 @@ matrix:
     fast_finish: true
     include:
           # Minimum supported Symfony version and latest PHP version
-        - php: 7.1
-          env: DEPENDENCIES="minimum" COVERAGE=true TEST_COMMAND="composer test-ci" SYMFONY_DEPRECATIONS_HELPER="weak" SYMFONY_PHPUNIT_VERSION="5.7"
+        - php: 7.2
+          env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" SYMFONY_DEPRECATIONS_HELPER="weak"
 
           # Test the latest stable release
+        - php: 5.5
+          env: SYMFONY_PHPUNIT_VERSION="5.7"
         - php: 5.6
           env: SYMFONY_PHPUNIT_VERSION="5.7"
         - php: 7.0
         - php: 7.1
         - php: 7.2
+          env: COVERAGE=true TEST_COMMAND="composer test-ci"
 
           # Test LTS versions
-        - php: 5.5
+        - php: 7.2
           env: DEPENDENCIES="dunglas/symfony-lock:^2"
-        - php: 5.5
+        - php: 7.2
           env: DEPENDENCIES="dunglas/symfony-lock:^3"
-        - php: 7.1
-          env: DEPENDENCIES="dunglas/symfony-lock:^4"
+        - php: 7.2
+          env: DEPENDENCIES="dunglas/symfony-lock:^4" STABILITY="rc"
 
           # Latest commit to master
-        - php: 7.1
-          env: DEPENDENCIES="dev"
+        - php: 7.2
+          env: STABILITY="dev"
 
     allow_failures:
           # dev-master is allowed to fail.
-        - php: 7.1
-          env: DEPENDENCIES="dev"
+        - php: 7.2
+          env: STABILITY="dev"
 
 before_install:
     - if [[ $COVERAGE != true ]]; then phpenv config-rm xdebug.ini || true; fi
-    - if [ "$DEPENDENCIES" = "minimum" ]; then COMPOSER_FLAGS="--prefer-stable --prefer-lowest"; fi;
-    - if [ "$DEPENDENCIES" = "dev" ]; then composer config minimum-stability dev; fi;
-    - if [[ $DEPENDENCIES == *"/"* ]]; then composer require --no-update $DEPENDENCIES; fi;
+    - if ! [ -z "$STABILITY" ]; then composer config minimum-stability ${STABILITY}; fi;
+    - if ! [ -v "$DEPENDENCIES" ]; then composer require --no-update ${DEPENDENCIES}; fi;
 
 install:
     # To be removed when this issue will be resolved: https://github.com/composer/composer/issues/5355