Add error response tests

tests/MockException.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Tobyz\Tests\JsonApiServer;
+
+use JsonApiPhp\JsonApi\Error;
+use Tobyz\JsonApiServer\ErrorProviderInterface;
+
+class MockException implements ErrorProviderInterface
+{
+    public function getJsonApiErrors(): array
+    {
+        return [
+            new Error(
+                new Error\Title('Mock Error'),
+                new Error\Status($this->getJsonApiStatus())
+            )
+        ];
+    }
+
+    public function getJsonApiStatus(): string
+    {
+        return '400';
+    }
+}

tests/specification/CreatingResourcesTest.php

@@ -138,7 +138,6 @@ class CreatingResourcesTest extends AbstractTestCase
                 ->withParsedBody([
                     'data' => [
                         'type' => 'pets',
-                        'id' => '1',
                     ],
                 ])
         );

tests/unit/JsonApiTest.php

@@ -11,17 +11,54 @@
 
 namespace Tobyz\Tests\JsonApiServer\unit;
 
-use PHPUnit\Framework\TestCase;
+use Exception;
+use Tobyz\JsonApiServer\JsonApi;
+use Tobyz\Tests\JsonApiServer\AbstractTestCase;
+use Tobyz\Tests\JsonApiServer\MockException;
 
-class JsonApiTest extends TestCase
+class JsonApiTest extends AbstractTestCase
 {
+    /**
+     * @var JsonApi
+     */
+    private $api;
+
+    public function setUp(): void
+    {
+        $this->api = new JsonApi('http://example.com');
+    }
+
     public function test_error_converts_error_provider_to_json_api_response()
     {
-        $this->markTestIncomplete();
+        $response = $this->api->error(
+            new MockException()
+        );
+
+        $this->assertEquals(400, $response->getStatusCode());
+        $this->assertJsonApiDocumentSubset([
+            'errors' => [
+                [
+                    'title' => 'Mock Error',
+                    'status' => '400',
+                ],
+            ],
+        ], $response->getBody());
     }
 
     public function test_error_converts_non_error_provider_to_internal_server_error()
     {
-        $this->markTestIncomplete();
+        $response = $this->api->error(
+            new Exception()
+        );
+
+        $this->assertEquals(500, $response->getStatusCode());
+        $this->assertJsonApiDocumentSubset([
+            'errors' => [
+                [
+                    'title' => 'Internal Server Error',
+                    'status' => '500',
+                ],
+            ],
+        ], $response->getBody());
     }
 }