diff --git a/tests/Glassboxx/Request/AuthTokenRequestTest.php b/tests/Glassboxx/Request/AuthTokenRequestTest.php
index c2a53cb..0ac805a 100644
--- a/tests/Glassboxx/Request/AuthTokenRequestTest.php
+++ b/tests/Glassboxx/Request/AuthTokenRequestTest.php
@@ -4,9 +4,8 @@ declare(strict_types=1);
 
 namespace Opdavies\Glassboxx\Tests\Glassboxx\Request;
 
-use Opdavies\Glassboxx\Config;
 use Opdavies\Glassboxx\Request\AuthTokenRequest;
-use PHPUnit\Framework\TestCase;
+use Opdavies\Glassboxx\Tests\Glassboxx\TestCase;
 use Symfony\Component\HttpClient\MockHttpClient;
 use Symfony\Contracts\HttpClient\ResponseInterface;
 
@@ -14,20 +13,9 @@ class AuthTokenRequestTest extends TestCase
 {
     public function testThatItGetsAnAuthCode(): void
     {
-        $config = $this->getMockBuilder(Config::class)
-            ->onlyMethods([])
-            ->setConstructorArgs(
-                [
-                    'vendor_id' => 123,
-                    'username' => 'opdavies',
-                    'password' => 'secret',
-                ]
-            )
+        $response = $this->getMockBuilder(ResponseInterface::class)
             ->getMock();
-
-        $mockResponse = $this->getMockBuilder(ResponseInterface::class)
-            ->getMock();
-        $mockResponse->method('getContent')->willReturn('"abc123"');
+        $response->method('getContent')->willReturn('"abc123"');
 
         $client = $this->getMockBuilder(MockHttpClient::class)->getMock();
         $client->expects($this->once())
@@ -43,10 +31,10 @@ class AuthTokenRequestTest extends TestCase
                     ],
                 ]
             )
-            ->willReturn($mockResponse);
+            ->willReturn($response);
 
         $token = (new AuthTokenRequest($client))
-            ->withConfig($config)
+            ->withConfig($this->config)
             ->getToken();
 
         $this->assertSame('abc123', $token);
diff --git a/tests/Glassboxx/TestCase.php b/tests/Glassboxx/TestCase.php
new file mode 100644
index 0000000..37f4d31
--- /dev/null
+++ b/tests/Glassboxx/TestCase.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Opdavies\Glassboxx\Tests\Glassboxx;
+
+use Opdavies\Glassboxx\Config;
+
+class TestCase extends \PHPUnit\Framework\TestCase
+{
+    /** @var Config */
+    protected $config;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->config = $this->getMockBuilder(Config::class)
+            ->onlyMethods([])
+            ->setConstructorArgs(
+                [
+                    'vendor_id' => 123,
+                    'username' => 'opdavies',
+                    'password' => 'secret',
+                ]
+            )
+            ->getMock();
+    }
+}