How to debug phpunit ? How to ​force display logs of phpunit ?

Introduction

See how to concretely, force an output message during a phpunit execution

fwrite(STDERR, "TEST");

Example of a use case in the code

/**
 * testArtworkSetsAssignmentInfoValidProductUUIDAction
 *
 * @throws \GuzzleHttp\Exception\GuzzleException
 *
 * @author  David Raleche
 * @version 08-26-2020
 */
public function testArtworkSetsAssignmentInfoValidProductUUIDAction()
{

    $payload = array(
        "order_id" => "1234560",
        "customer_id" => "12345",
        "product_info" => [
        "product_uuid" => "12345"
            ]
    );

    $jsonPayload = json_encode($payload);

    $artwork_set_uuid = ArtworkToolService::postArtworkSets($jsonPayload, 12345);


    /** ------------------------- GET ------------------------------------------------- */
    $headers = [
        'Authorization' => QATemplate::$getKey,
    ];
    $url = '/v1/artwork-info/' . $artwork_set_uuid . '/assignment-info';
    $response = QATemplate::$http->request(
        'GET',
        $url,
        [
            'verify' => false,
            'headers' => $headers,
            'http_errors' => false,


        ]
    );

    fwrite(STDERR, (string) $url);
    fwrite(STDERR, (string)$response->getStatusCode());
    
    $this->assertEquals(422, $response->getStatusCode());
    $contentType = $response->getHeaders()["Content-Type"][0];
    $this->assertEquals("application/json", $contentType);

    /* test for output */
    $body = $response->getBody();
    $jsonBody = (array)json_decode((string)$body);
    fwrite(STDERR, $jsonBody['message']);
    $this->assertEquals('Product UUID has not a valid format :12345', $jsonBody['message']);
}

See output below