@Test
public void getMerchant() {

    assertNull(new OcrResponseParser(null).getMerchant());
    assertNull(new OcrResponseParser(new OcrResponse(null, null, null, null, null, null, null, null)).getMerchant());
    assertNull(new OcrResponseParser(new OcrResponse(null, null, null, null, new OcrResponseField<>(null, null), null, null, null)).getMerchant());
    assertEquals("merchant", new OcrResponseParser(new OcrResponse(null, null, null, null, new OcrResponseField<>("merchant", null), null, null, null)).getMerchant());
}