### Question:
WxMaQrcodeServiceImpl implements WxMaQrcodeService { @Override public byte[] createQrcodeBytes(String path, int width) throws WxErrorException { final QrcodeBytesRequestExecutor executor = new QrcodeBytesRequestExecutor(this.wxMaService.getRequestHttp()); return this.wxMaService.execute(executor, CREATE_QRCODE_URL, new WxMaQrcode(path, width)); } WxMaQrcodeServiceImpl(WxMaService wxMaService); @Override byte[] createQrcodeBytes(String path, int width); @Override File createQrcode(String path, int width); @Override File createQrcode(String path); @Override byte[] createWxaCodeBytes(String path, int width, boolean autoColor, WxMaCodeLineColor lineColor, boolean isHyaline); @Override File createWxaCode(String path, int width, boolean autoColor, WxMaCodeLineColor lineColor, boolean isHyaline); @Override File createWxaCode(String path, int width); @Override File createWxaCode(String path); @Override byte[] createWxaCodeUnlimitBytes(String scene, String page, int width, boolean autoColor,
                                          WxMaCodeLineColor lineColor, boolean isHyaline); @Override File createWxaCodeUnlimit(String scene, String page, int width, boolean autoColor,
                                   WxMaCodeLineColor lineColor, boolean isHyaline); @Override File createWxaCodeUnlimit(String scene, String page);  }### Answer:
@Test public void testCreateQrcodeBytes() throws WxErrorException { final byte[] qrCode = this.wxService.getQrcodeService().createQrcodeBytes("111", 122); assertThat(qrCode).isNotNull(); }