Add composer test script

Author: alexkart

composer.json

@@ -1,36 +1,37 @@
 {
-  "name": "alexkart/curl-builder",
-  "description": "PSR-7 compatible curl builder.",
-  "type": "library",
-  "license": "MIT",
-  "authors": [
-    {
-      "name": "Alexander Kartavenko",
-      "email": "[email protected]"
+    "name": "alexkart/curl-builder",
+    "description": "PSR-7 compatible curl builder.",
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Alexander Kartavenko",
+            "email": "[email protected]"
+        }
+    ],
+    "minimum-stability": "dev",
+    "prefer-stable": true,
+    "require": {
+        "php": ">=7.1",
+        "psr/http-message": "^1.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^7.2",
+        "nyholm/psr7": "^1.3",
+        "phan/phan": "^3.2"
+    },
+    "autoload": {
+        "psr-4": {
+            "Alexkart\\CurlBuilder\\": "src"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Alexkart\\CurlBuilder\\Tests\\": "tests"
+        }
+    },
+    "scripts": {
+        "phan": "phan --progress-bar -o analysis.txt",
+        "test": "vendor/bin/phpunit"
     }
-  ],
-  "minimum-stability": "dev",
-  "prefer-stable": true,
-  "require": {
-    "php": ">=7.1",
-    "psr/http-message": "^1.0"
-  },
-  "require-dev": {
-    "phpunit/phpunit": "^7.2",
-    "nyholm/psr7": "^1.3",
-    "phan/phan": "^3.2"
-  },
-  "autoload": {
-    "psr-4": {
-      "Alexkart\\CurlBuilder\\": "src"
-    }
-  },
-  "autoload-dev": {
-    "psr-4": {
-      "Alexkart\\CurlBuilder\\Tests\\": "tests"
-    }
-  },
-  "scripts": {
-    "phan": "phan --progress-bar -o analysis.txt"
-  }
 }