[Travis] run Constraints tests and on 2.5 branch

Author: Naktibalda

.travis.yml

@@ -16,3 +16,10 @@ before_script:
 script:
   - php robo.phar test cli
   - php robo.phar test "unit -g core"
+  - php robo.phar test "tests/unit/Codeception/Constraints/"
+# run tests with 2.5 branch
+  - CODECEPTION_VERSION=2.5.x-dev php robo.phar prepare
+  - composer update
+  - php robo.phar test cli
+  - php robo.phar test "unit -g core"
+  - php robo.phar test "tests/unit/Codeception/Constraints/"

composer.json

@@ -27,5 +27,8 @@
     "require-dev": {
         "vlucas/phpdotenv": "^3.0",
         "codeception/specify": "*"
+    },
+    "config": {
+        "discard-changes": true
     }
 }