public function testInvokeFailedBuild()
{
// Add new invalid target.
$this->config->addTarget('invalid.css', ['files' => [APP . 'invalid.css']]);
$request = ServerRequestFactory::fromGlobals(['REQUEST_URI' => '/assets/invalid.css']);
$response = new Response();
$next = function ($req, $res) {
return $res;
};
$res = $this->middleware->__invoke($request, $response, $next);
$this->assertNotSame($res, $response, 'Should be a new response');
$this->assertSame(400, $res->getStatusCode(), 'Is 400 on failure');
$this->assertSame('text/plain', $res->getHeaderLine('Content-Type'));
}