PMC-1378 Create/Fix unit tests for the feature "GMail API email server"

tests/unit/workflow/engine/methods/emailServer/EmailServerGmailOAuthTest.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Tests\unit\workflow\engine\methods\emailServer;
+
+use Faker\Factory;
+use Google_Auth_Exception;
+use ProcessMaker\GmailOAuth\GmailOAuth;
+use ProcessMaker\Model\User;
+use RBAC;
+use Tests\TestCase;
+
+class EmailServerGmailOAuthTest extends TestCase
+{
+    /**
+     * This test expects an exception from the Google client.
+     * The Google client requires valid codes to obtain the clientId from a request, 
+     * otherwise it will throw an exception.
+     * @test
+     */
+    public function it_should_try_to_authenticate_on_google_oauth_with_a_fake_code()
+    {
+        $faker = Factory::create();
+        global $RBAC;
+
+        $user = User::where('USR_ID', '=', 1)
+                ->get()
+                ->first();
+
+        $_SESSION['USER_LOGGED'] = $user['USR_UID'];
+        $_POST['USR_UID'] = $user['USR_UID'];
+
+        $RBAC = RBAC::getSingleton(PATH_DATA, session_id());
+        $RBAC->initRBAC();
+        $RBAC->loadUserRolePermission('PROCESSMAKER', $_SESSION['USER_LOGGED']);
+
+        $_SESSION['gmailOAuth'] = new GmailOAuth();
+
+        /**
+         * This gets a fake code, according to the nomenclature.
+         */
+        $_GET['code'] = $faker->regexify("/[1-9]\/[a-zA-Z]{25}-[a-zA-Z]{16}_[a-zA-Z]{19}-[a-zA-Z]{24}/");
+
+        $this->expectException(Google_Auth_Exception::class);
+        require_once PATH_METHODS . 'emailServer/emailServerGmailOAuth.php';
+    }
+}