Add tests for the notification process

tests/Feature/NotificationTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Tests\Feature;
+
+use PlacetoPay\BancolombiaSDK\BancolombiaButton;
+use PlacetoPay\BancolombiaSDK\Exceptions\BancolombiaException;
+use Tests\BaseTestCase;
+
+class NotificationTest extends BaseTestCase
+{
+    /**
+     * @test
+     */
+    public function it_handles_the_validation_for_signature()
+    {
+        // This secret is provided by us to Bancolombia
+        $clientSecret = '1Fj8eK4rlyUd252L48herdrnEZ';
+
+        $response = BancolombiaButton::handleCallback(
+            json_decode('{"transferVoucher":"null","transferAmount":"3458.00","transferStateDescription":"Transaction rejected by user","sign":"747898130598830097d87b8c9ffc14ae28a4cb433fff7f96dcf7a1661d0e6fd436bb59fca03ca682a5004c7c6c9641d43fc9608af70cbe2ac2fa3b83c2dba510","requestDate":"2021-02-25T08:33:06.948-0500","transferState":"rejected","transferDate":"null","transferCode":"_SQC5uKmF6L","transferReference":"1614259966","commerceTransferButtonId":"h4ShG3NER1C"}', true),
+            $clientSecret
+        );
+
+        $this->assertEquals('_SQC5uKmF6L', $response->code());
+        $this->assertEquals('rejected', $response->state());
+    }
+
+    /**
+     * @test
+     */
+    public function it_throws_exception_if_the_signature_is_invalid()
+    {
+        $this->expectException(BancolombiaException::class);
+        $clientSecret = 'not_the_secret';
+
+        BancolombiaButton::handleCallback(
+            json_decode('{"transferVoucher":"null","transferAmount":"3458.00","transferStateDescription":"Transaction rejected by user","sign":"747898130598830097d87b8c9ffc14ae28a4cb433fff7f96dcf7a1661d0e6fd436bb59fca03ca682a5004c7c6c9641d43fc9608af70cbe2ac2fa3b83c2dba510","requestDate":"2021-02-25T08:33:06.948-0500","transferState":"rejected","transferDate":"null","transferCode":"_SQC5uKmF6L","transferReference":"1614259966","commerceTransferButtonId":"h4ShG3NER1C"}', true),
+            $clientSecret
+        );
+    }
+}