diff --git a/composer.json b/composer.json
index cead0b0..7f205ed 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,8 @@
     ],
     "require": {
         "php": ">=7.0",
-        "guzzlehttp/guzzle": "~6.0"
+        "guzzlehttp/guzzle": "~6.0",
+        "respect/validation": "^1.1.9"
     },
     "require-dev": {
         "phpunit/phpunit": "~5.0",
@@ -22,6 +23,11 @@
             "CraigPaul\\Moneris\\": "src/"
         }
     },
+    "autoload-dev": {
+        "classmap": [
+            "tests/TestCase.php"
+        ]
+    },
     "minimum-stability": "dev",
     "prefer-stable": true
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
new file mode 100644
index 0000000..a24ed3a
--- /dev/null
+++ b/tests/TestCase.php
@@ -0,0 +1,33 @@
+<?php
+
+class TestCase extends PHPUnit_Framework_TestCase
+{
+    /**
+     * @var string
+     */
+    protected $amex;
+
+    /**
+     * @var string
+     */
+    protected $mastercard;
+
+    /**
+     * @var string
+     */
+    protected $visa;
+
+    /**
+     * Set up the test environment.
+     *
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->amex = '373599005095005';
+        $this->mastercard = '5454545454545454';
+        $this->visa = '4242424242424242';
+    }
+}
\ No newline at end of file