add phpunit

Author: nophaa

.php_cs

@@ -6,7 +6,8 @@ $finder = PhpCsFixer\Finder::create()
 $config = PhpCsFixer\Config::create()
     ->setRiskyAllowed(true)
     ->setRules([
-
+        '@PSR2' => true,
+        '@Symfony' => true,
     ])
     ->setFinder($finder);
 

composer.json

@@ -15,24 +15,26 @@
         "ext-xml": "*",
         "psr/cache": "^1.0",
         "php-http/client-common": "^1.6",
-        "php-http/guzzle6-adapter": "^1.0",
-        "php-http/discovery": "^1.2",
+        "php-http/guzzle6-adapter": "^1.1",
+        "php-http/discovery": "^1.4",
         "php-http/httplug": "^1.1",
         "php-http/multipart-stream-builder": "^1.0",
         "php-http/cache-plugin": "^1.4",
         "symfony/options-resolver": "^2.6 || ^3.0 || ^4.0"
     },
     "require-dev": {
-        "guzzlehttp/psr7": "^1.2",
-        "php-http/guzzle6-adapter": "^1.0",
+        "guzzlehttp/psr7": "^1.4",
+        "php-http/guzzle6-adapter": "^1.1",
         "php-http/mock-client": "^1.0",
-        "phpunit/phpunit": "^5.0"
+        "phpunit/phpunit": "^7.4",
+        "phpunit/php-invoker": "^2.0",
+        "donatj/mock-webserver": "^2.0"
     },
     "autoload": {
         "psr-4": { "Sipwise\\": "lib/Sipwise/" }
     },
     "autoload-dev": {
-        "psr-4": { "Sipwise\\Tests\\": "test/Sipwise/Tests/" }
+        "psr-4": { "Sipwise\\Tests\\": "tests/SipwiseTests/" }
     },
     "extra": {
         "branch-alias": {