Fix test (#12)

Author: fre5h

Diff for: Tests/Generator/GeneratorTest.php

@@ -44,7 +44,7 @@ protected function setUp(): void
         $this->filesystem->dumpFile($this->docsFile, '');
         $this->filesystem->dumpFile($this->specificationFile, '');
 
-        $this->generator = new Generator($this->twig, $this->parser, $this->docsFolder);
+        $this->generator = new Generator($this->twig, $this->parser, $this->docsFolder, 'custom.html.twig');
     }
 
     protected function tearDown(): void
@@ -73,7 +73,7 @@ public function testGenerate(): void
         $this->twig
             ->expects(self::once())
             ->method('render')
-            ->with('@Swagger/SwaggerUi/index.html.twig', ['swagger_data' => $swaggerConfig])
+            ->with('custom.html.twig', ['swagger_data' => $swaggerConfig])
             ->willReturn($docs)
         ;