Added unit tests for CompositeKeyArray.

Author: Sevavietl

bootstrap.php

@@ -0,0 +1,3 @@
+<?php
+
+$loader = require __DIR__ . '/vendor/autoload.php';

composer.json

@@ -9,14 +9,20 @@
         }
     ],
     "require": {},
+    "require-dev": {
+        "phpunit/phpunit": "5.5.*"
+    },
     "autoload": {
         "psr-4": {
             "Sevavietl\\Arrays\\": "src/"
         }
     },
     "autoload-dev": {
         "psr-4": {
-            "Sevavietl\\Arrays\\Tests": "tests/"
-        }
+            "Sevavietl\\Arrays\\Tests\\Unit\\": "tests/unit/"
+        },
+        "classmap": [
+            "tests/TestCase.php"
+        ]
     }
 }