/**
  * @test
  */
 public function should_upload_an_article_and_respond_with_article_instance()
 {
     $responseMock = $this->createResponseMock(200, __DIR__ . '/../../fixtures/articles/uploaded.json');
     $apiClient = $this->createTestApiClient($responseMock);
     $article = new UploadArticle();
     $article->setCollectionId(uniqid());
     $article->setName(uniqid('Uploaded Article '));
     $article->setFile(__DIR__ . '/../../fixtures/articles/article.html');
     $uploaded = $apiClient->uploadArticle($article, true);
     $this->assertInstanceOf(Article::class, $uploaded);
 }
<?php

use HelpScoutDocs\DocsApiClient;
use HelpScoutDocs\Models\UploadArticle;
require_once __DIR__ . '/../vendor/autoload.php';
$docsClient = new DocsApiClient();
$docsClient->setKey('API_KEY');
$upload = new UploadArticle();
$upload->setCollectionId('COLLECTION_ID');
$upload->setName(uniqid('Uploaded Article '));
$upload->setFile('REAL_PATH_TO_FILE');
$article = $docsClient->uploadArticle($upload, true);