Improve the testsuite and the CI setup

- use autoload-dev to register the test autoloading in the composer
  classloader
- disallow testsuite failures on HHVM
- run the testsuite against stable dependencies by default
- add testing against lowest dependencies on Travis
- add testing against dev version of dependencies on Travis

.travis.yml

@@ -4,7 +4,7 @@ sudo: false
 
 cache:
     directories:
-        - $HOME/.composer/cache
+        - $HOME/.composer/cache/files
 
 php:
     - 5.3
@@ -13,13 +13,20 @@ php:
     - 5.6
     - 7.0
     - hhvm
-    
+
 matrix:
-    allow_failures:
-        - php: hhvm
+    include:
+        - php: 5.3
+          env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable' SYMFONY_DEPRECATIONS_HELPER=weak
+        - php: 5.6
+          env: DEPENDENCIES=dev
+
+before_install:
+    - composer self-update
+    - if [ "$DEPENDENCIES" = "dev" ]; then perl -pi -e 's/^}$/,"minimum-stability":"dev"}/' composer.json; fi;
+
+install:
+    - composer update $COMPOSER_FLAGS
 
-before_script:
-    - composer install
-
 script:
     - phpunit

composer.json

@@ -36,10 +36,14 @@
     "autoload":     {
         "psr-4": { "Knp\\Menu\\": "src/Knp/Menu" }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "Knp\\Menu\\Tests\\": "tests/Knp/Menu/Tests"
+        }
+    },
     "extra": {
         "branch-alias": {
             "dev-master": "2.1-dev"
         }
-    },
-    "minimum-stability": "dev"
+    }
 }

phpunit.xml.dist

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit colors="true" bootstrap="tests/bootstrap.php">
+<phpunit colors="true" bootstrap="vendor/autoload.php">
     <testsuites>
         <testsuite name="KnpMenu Test Suite">
             <directory suffix="Test.php">./tests/</directory>