Added API test for single-step short URL creation action

CHANGELOG.md

@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com), and this
 
 ### Fixed
 * [#968](https://github.com/shlinkio/shlink/issues/968) Fixed index error in MariaDB while updating to v2.5.0.
+* [#972](https://github.com/shlinkio/shlink/issues/972) Fixed 500 error when calling single-step short URL creation endpoint.
 
 
 ## [2.5.0] - 2021-01-17

module/Rest/test-api/Action/SingleStepCreateShortUrlTest.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkioApiTest\Shlink\Rest\Action;
+
+use GuzzleHttp\RequestOptions;
+use Psr\Http\Message\ResponseInterface;
+use Shlinkio\Shlink\TestUtils\ApiTest\ApiTestCase;
+
+class SingleStepCreateShortUrlTest extends ApiTestCase
+{
+    /**
+     * @test
+     * @dataProvider provideFormats
+     */
+    public function createsNewShortUrlWithExpectedResponse(?string $format, string $expectedContentType): void
+    {
+        $resp = $this->createShortUrl($format, 'valid_api_key');
+
+        self::assertEquals(self::STATUS_OK, $resp->getStatusCode());
+        self::assertEquals($expectedContentType, $resp->getHeaderLine('Content-Type'));
+    }
+
+    public function provideFormats(): iterable
+    {
+        yield 'txt format' => ['txt', 'text/plain'];
+        yield 'json format' => ['json', 'application/json'];
+        yield '<empty> format' => [null, 'application/json'];
+    }
+
+    /** @test */
+    public function authorizationErrorIsReturnedIfNoApiKeyIsSent(): void
+    {
+        $expectedDetail = 'Expected authentication to be provided in "apiKey" query param';
+
+        $resp = $this->createShortUrl();
+        $payload = $this->getJsonResponsePayload($resp);
+
+        self::assertEquals(self::STATUS_UNAUTHORIZED, $resp->getStatusCode());
+        self::assertEquals(self::STATUS_UNAUTHORIZED, $payload['status']);
+        self::assertEquals('INVALID_AUTHORIZATION', $payload['type']);
+        self::assertEquals($expectedDetail, $payload['detail']);
+        self::assertEquals('Invalid authorization', $payload['title']);
+    }
+
+    private function createShortUrl(?string $format = 'json', ?string $apiKey = null): ResponseInterface
+    {
+        $query = [
+            'longUrl' => 'https://app.shlink.io',
+            'apiKey' => $apiKey,
+            'format' => $format,
+        ];
+        return $this->callApi(self::METHOD_GET, '/short-urls/shorten', [RequestOptions::QUERY => $query]);
+    }
+}