Adds tokenization test

tests/VaultTest.php

@@ -1,5 +1,6 @@
 <?php
 
+use CraigPaul\Moneris\Moneris;
 use CraigPaul\Moneris\Vault;
 use CraigPaul\Moneris\CreditCard;
 
@@ -92,4 +93,23 @@ public function it_can_delete_a_credit_card_from_the_moneris_vault_and_returns_a
         $this->assertNotNull($receipt->DataKey);
         $this->assertEquals($key, $receipt->DataKey);
     }
+
+    /** @test */
+    public function it_can_tokenize_a_previous_transaction_to_add_the_transactions_credit_card_in_the_moneris_vault_and_returns_a_data_key_for_storage()
+    {
+        $gateway = Moneris::create($this->id, $this->token, ['environment' => Moneris::ENV_TESTING]);
+
+        $response = $gateway->purchase([
+            'order_id' => uniqid('1234-56789', true),
+            'amount' => '1.00',
+            'credit_card' => $this->visa,
+            'expdate' => '2012',
+        ]);
+
+        $response = $this->vault->tokenize($response->transaction);
+        $receipt = $response->receipt();
+
+        $this->assertTrue($response->successful);
+        $this->assertNotNull($receipt->DataKey);
+    }
 }