Add functionality for converting exceptions to HTTP responses

[MAILPOET-2900]

tests/unit/API/JSON/ErrorHandlerTest.php

@@ -0,0 +1,46 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\API\JSON;
+
+use MailPoet\AccessDeniedException;
+use MailPoet\ConflictException;
+use MailPoet\Exception;
+use MailPoet\InvalidStateException;
+use MailPoet\NotFoundException;
+use MailPoet\RuntimeException;
+use MailPoet\UnexpectedValueException;
+use MailPoet\WP\Functions as WPFunctions;
+
+class ErrorHandlerTest extends \MailPoetUnitTest {
+  public function testItCovertsToBadRequest() {
+    $this->runErrorHandlerTest(new UnexpectedValueException(), 400);
+  }
+
+  public function testItCovertsToForbidden() {
+    $this->runErrorHandlerTest(new AccessDeniedException(), 403);
+  }
+
+  public function testItCovertsToNotFound() {
+    $this->runErrorHandlerTest(new NotFoundException(), 404);
+  }
+
+  public function testItCovertsToConflict() {
+    $this->runErrorHandlerTest(new ConflictException(), 409);
+  }
+
+  public function testItCovertsToServerError() {
+    $this->runErrorHandlerTest(new RuntimeException(), 500);
+    $this->runErrorHandlerTest(new InvalidStateException(), 500);
+  }
+
+  private function runErrorHandlerTest(Exception $exception, int $expectedCode) {
+    $errorHandler = new ErrorHandler(new WPFunctions());
+    $response = $errorHandler->convertToResponse($exception->withErrors([
+      'key' => 'value',
+    ]));
+
+    expect($response)->isInstanceOf(ErrorResponse::class);
+    expect($response->status)->equals($expectedCode);
+    expect($response->errors)->equals([['error' => 'key', 'message' => 'value']]);
+  }
+}