Add test

test/Middleware/ExceptionHandlerMiddlewareTest.php

@@ -0,0 +1,59 @@
+<?php declare(strict_types=1);
+
+namespace Amp\Http\Server\Test\Middleware;
+
+use Amp\Http\HttpStatus;
+use Amp\Http\Server\Driver\Client;
+use Amp\Http\Server\ExceptionHandler;
+use Amp\Http\Server\HttpErrorException;
+use Amp\Http\Server\Middleware\ExceptionHandlerMiddleware;
+use Amp\Http\Server\Request;
+use Amp\Http\Server\RequestHandler;
+use Amp\Http\Server\Response;
+use Amp\PHPUnit\AsyncTestCase;
+use Amp\PHPUnit\TestException;
+use League\Uri\Http;
+
+class ExceptionHandlerMiddlewareTest extends AsyncTestCase
+{
+    private function setupAndInvokeMiddleware(ExceptionHandler $exceptionHandler, \Throwable $exception): Response
+    {
+        $request = new Request($this->createMock(Client::class), 'GET', Http::createFromString('/'));
+
+        $requestHandler = $this->createMock(RequestHandler::class);
+        $requestHandler->expects(self::once())
+            ->method('handleRequest')
+            ->with($request)
+            ->willThrowException($exception);
+
+        $middleware = new ExceptionHandlerMiddleware($exceptionHandler);
+
+        return $middleware->handleRequest($request, $requestHandler);
+    }
+
+    public function testUncaughtException(): void
+    {
+        $exception = new TestException();
+
+        $exceptionHandler = $this->createMock(ExceptionHandler::class);
+        $exceptionHandler->expects(self::once())
+            ->method('handleException')
+            ->with($exception)
+            ->willReturn(new Response(HttpStatus::INTERNAL_SERVER_ERROR));
+
+        $this->setupAndInvokeMiddleware($exceptionHandler, $exception);
+    }
+
+    public function testHttpErrorException(): void
+    {
+        $exception = new HttpErrorException(HttpStatus::BAD_REQUEST);
+
+        $exceptionHandler = $this->createMock(ExceptionHandler::class);
+        $exceptionHandler->expects(self::never())
+            ->method('handleException');
+
+        $this->expectExceptionObject($exception);
+
+        $this->setupAndInvokeMiddleware($exceptionHandler, $exception);
+    }
+}