Added more Rest module tests

module/Rest/test/ConfigProviderTest.php

@@ -0,0 +1,33 @@
+<?php
+namespace ShlinkioTest\Shlink\Rest;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\Rest\ConfigProvider;
+
+class ConfigProviderTest extends TestCase
+{
+    /**
+     * @var ConfigProvider
+     */
+    protected $configProvider;
+
+    public function setUp()
+    {
+        $this->configProvider = new ConfigProvider();
+    }
+
+    /**
+     * @test
+     */
+    public function properConfigIsReturned()
+    {
+        $config = $this->configProvider->__invoke();
+
+        $this->assertArrayHasKey('error_handler', $config);
+        $this->assertArrayHasKey('middleware_pipeline', $config);
+        $this->assertArrayHasKey('rest', $config);
+        $this->assertArrayHasKey('routes', $config);
+        $this->assertArrayHasKey('services', $config);
+        $this->assertArrayHasKey('translator', $config);
+    }
+}

module/Rest/test/ErrorHandler/JsonErrorHandlerTest.php

@@ -0,0 +1,79 @@
+<?php
+namespace ShlinkioTest\Shlink\Rest\ErrorHandler;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\Rest\ErrorHandler\JsonErrorHandler;
+use Zend\Diactoros\Response;
+use Zend\Diactoros\ServerRequestFactory;
+use Zend\Expressive\Router\RouteResult;
+
+class JsonErrorHandlerTest extends TestCase
+{
+    /**
+     * @var JsonErrorHandler
+     */
+    protected $errorHandler;
+
+    public function setUp()
+    {
+        $this->errorHandler = new JsonErrorHandler();
+    }
+
+    /**
+     * @test
+     */
+    public function noMatchedRouteReturnsNotFoundResponse()
+    {
+        $response = $this->errorHandler->__invoke(ServerRequestFactory::fromGlobals(), new Response());
+        $this->assertInstanceOf(Response\JsonResponse::class, $response);
+        $this->assertEquals(404, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function matchedRouteWithErrorReturnsMethodNotAllowedResponse()
+    {
+        $response = $this->errorHandler->__invoke(
+            ServerRequestFactory::fromGlobals(),
+            (new Response())->withStatus(405),
+            405
+        );
+        $this->assertInstanceOf(Response\JsonResponse::class, $response);
+        $this->assertEquals(405, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function responseWithErrorKeepsStatus()
+    {
+        $response = $this->errorHandler->__invoke(
+            ServerRequestFactory::fromGlobals()->withAttribute(
+                RouteResult::class,
+                RouteResult::fromRouteMatch('foo', 'bar', [])
+            ),
+            (new Response())->withStatus(401),
+            401
+        );
+        $this->assertInstanceOf(Response\JsonResponse::class, $response);
+        $this->assertEquals(401, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function responseWithoutErrorReturnsStatus500()
+    {
+        $response = $this->errorHandler->__invoke(
+            ServerRequestFactory::fromGlobals()->withAttribute(
+                RouteResult::class,
+                RouteResult::fromRouteMatch('foo', 'bar', [])
+            ),
+            (new Response())->withStatus(200),
+            'Some error'
+        );
+        $this->assertInstanceOf(Response\JsonResponse::class, $response);
+        $this->assertEquals(500, $response->getStatusCode());
+    }
+}