added tests and fixes

Author: featherbits

composer.json

@@ -9,12 +9,16 @@
             "email": "[email protected]"
         }
     ],
-    "require": {
-    },
+    "require": {},
     "autoload": {
-        "psr-4": {"Featherbits\\": "src/"}
+        "psr-4": {
+            "Featherbits\\ServiceContainer\\": "src/"
+        }
     },
     "provide": {
         "psr/container-implementation": "1.0.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^9.2"
     }
 }