$response->getBody() is empty when testing Slim 3 routes with PHPUnit - php

Question

I use the following method to dispatch a Slim app's route in my PHPUnit tests:
protected function dispatch($path, $method='GET', $data=array())
{
// Prepare a mock environment
$env = Environment::mock(array(
'REQUEST_URI' => $path,
'REQUEST_METHOD' => $method,
));
// Prepare request and response objects
$uri = Uri::createFromEnvironment($env);
$headers = Headers::createFromEnvironment($env);
$cookies = [];
$serverParams = $env->all();
$body = new RequestBody();
// create request, and set params
$req = new Request($method, $uri, $headers, $cookies, $serverParams, $body);
if (!empty($data))
$req = $req->withParsedBody($data);
$res = new Response();
$this->headers = $headers;
$this->request = $req;
$this->response = call_user_func_array($this->app, array($req, $res));
}
For example:
public function testGetProducts()
{
$this->dispatch('/products');
$this->assertEquals(200, $this->response->getStatusCode());
}
However, as much as things like the status code and header are in the response, (string) $response->getBody() is empty so I cannot check for the presence of elements in the HTML. When I run the same route in the browser, I get the expected HTML output. Also, if I echo $response->getBody(); exit; and then view the output in the browser, I see HTML body. Is there any reason, with my implementation, I'm not seeing this in the my tests? (in the CLI, so different environment I guess)

Answer 1

$response->getBody() will be empty as you've set up the parsed body. It's easier to put it into the RequestBody as a string in the same way as it would be set if it came in over the wire.
i.e something like this:
protected function dispatch($path, $method='GET', $data=array())
{
// Prepare a mock environment
$env = Environment::mock(array(
'REQUEST_URI' => $path,
'REQUEST_METHOD' => $method,
'CONTENT_TYPE' => 'application/json',
));
// Prepare request and response objects
$uri = Uri::createFromEnvironment($env);
$headers = Headers::createFromEnvironment($env);
$cookies = [];
$serverParams = $env->all();
$body = new RequestBody();
if (!empty($data)) {
$body->write(json_encode($data));
}
// create request, and set params
$req = new Request($method, $uri, $headers, $cookies, $serverParams, $body);
$res = new Response();
$this->headers = $headers;
$this->request = $req;
$this->response = call_user_func_array($this->app, array($req, $res));
}