Add abstract class for REST API integration tests

[MAILPOET-4207]

mailpoet/tests/integration/REST/Test.php

@@ -0,0 +1,69 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\REST;
+
+use MailPoetTest;
+use RuntimeException;
+
+use function json_decode;
+
+abstract class Test extends MailPoetTest {
+  /** @param array{query?: array, post?: array, json?: array} $options */
+  protected function get(string $path, array $options = []) {
+    return $this->request($path, 'GET', $options);
+  }
+
+  /** @param array{query?: array, post?: array, json?: array} $options */
+  protected function post(string $path, array $options = []) {
+    return $this->request($path, 'POST', $options);
+  }
+
+  /** @param array{query?: array, post?: array, json?: array} $options */
+  protected function put(string $path, array $options = []) {
+    return $this->request($path, 'PUT', $options);
+  }
+
+  /** @param array{query?: array, post?: array, json?: array} $options */
+  protected function patch(string $path, array $options = []) {
+    return $this->request($path, 'PATCH', $options);
+  }
+
+  /** @param array{query?: array, post?: array, json?: array} $options */
+  protected function delete(string $path, array $options = []) {
+    return $this->request($path, 'DELETE', $options);
+  }
+
+  /** @param array{query?: array, post?: array, json?: array} $options */
+  protected function request(string $path, string $method, array $options = []) {
+    $_SERVER['REQUEST_METHOD'] = $method;
+    $_SERVER['HTTP_CONTENT_TYPE'] = 'application/json';
+
+    if (isset($options['query'])) {
+      $_GET = $options['query'];
+    }
+
+    if (isset($options['post'])) {
+      $_POST = $options['post'];
+    }
+
+    if (isset($options['json'])) {
+      $GLOBALS['HTTP_RAW_POST_DATA'] = json_encode($options['json']);
+    }
+
+    $server = rest_get_server();
+    ob_start();
+    $server->serve_request($path);
+    $response = ob_get_clean();
+
+    if (!$response) {
+      throw new RuntimeException();
+    }
+
+    $value = json_decode($response, true);
+    $error = json_last_error();
+    if ($error) {
+      throw new RuntimeException(json_last_error_msg(), $error);
+    }
+    return $value;
+  }
+}

mailpoet/tests/integration/_bootstrap.php

@@ -101,6 +101,7 @@ abstract class MailPoetTest extends \Codeception\TestCase\Test { // phpcs:ignore
     '_FILES',
     '_REQUEST',
     '_SERVER',
+    'HTTP_RAW_POST_DATA',
   ];
 
   protected $backupGlobals = false;