assertRequestIsSigned example

static::assertNotNull($setup);

        $uriWithoutQuery = $registrationRequest->getUri()->withQuery('');
        static::assertEquals($setup->getRegistrationUrl(), (string) $uriWithoutQuery);
        static::assertNotEmpty($registrationRequest->getHeaderLine('sw-version'));
        static::assertNotEmpty($registrationRequest->getHeaderLine(AuthMiddleware::SHOPWARE_USER_LANGUAGE));
        static::assertNotEmpty($registrationRequest->getHeaderLine(AuthMiddleware::SHOPWARE_CONTEXT_LANGUAGE));

        $secret = $setup->getSecret();
        static::assertNotNull($secret);

        $this->assertRequestIsSigned($registrationRequest, $secret);

        $app = $this->fetchApp($id);

        static::assertEquals(TestAppServer::APP_SECRET, $app->getAppSecret());

        static::assertEquals(2, $this->getRequestCount());

        $confirmationReq = $this->getPastRequest(1);
        static::assertEquals('POST', $confirmationReq->getMethod());

        $postBody = \json_decode($confirmationReq->getBody()->getContents(), true, 512, \JSON_THROW_ON_ERROR);