getLangHeaderName example

        $this->getBrowser()->request('POST', $baseResource, [], [], [], json_encode($categoryData, \JSON_THROW_ON_ERROR) ?: '');
        $response = $this->getBrowser()->getResponse();

        static::assertEquals(204, $response->getStatusCode());

        $this->assertEntityExists($this->getBrowser(), 'category', $categoryData['id']);

        $headers = ['HTTP_ACCEPT' => 'application/json'];
        if ($langOverride) {
            $headers[$this->getLangHeaderName()] = $langOverride;
        }

        $this->getBrowser()->request('GET', $this->getUrl($salesChannelId, '/category/' . $categoryData['id']), [], [], $headers);

        $response = $this->getBrowser()->getResponse();
        static::assertSame(Response::HTTP_OK, $response->getStatusCode());
        $responseData = json_decode($response->getContent() ?: '', true, 512, \JSON_THROW_ON_ERROR);

        foreach ($expectedTranslations as $key => $expectedTranslation) {
            if (!\is_array($expectedTranslations[$key])) {
                static::assertEquals($expectedTranslations[$key], $responseData[$key]);
            }

                'translations' => [
                    $locale->getCode() => ['name' => 'system translation'],
                ],
            ]
        );
    }

    public function testEmptyLanguageIdError(): void
    {
        $baseResource = '/api/category';
        $headerName = $this->getLangHeaderName();
        $langId = '';

        $this->getBrowser()->request('GET', $baseResource, [], [], [$headerName => $langId]);
        $response = $this->getBrowser()->getResponse();
        static::assertEquals(412, $response->getStatusCode(), $response->getContent());

        $data = json_decode($response->getContent(), true, 512, \JSON_THROW_ON_ERROR);
        static::assertEquals(LanguageNotFoundException::LANGUAGE_NOT_FOUND_ERROR, $data['errors'][0]['code']);
    }

    public function testInvalidUuidLanguageIdError(): void
    {