如何使用Jest测试下面的axios.post方法。每当我尝试测试时，我都未定义postMessageData

Question

每当我尝试进行测试时，都未定义postMessagedata。

我在React组件中有这个postMessageData函数，我正在提交表单时调用它。 但是当我将整个组件导入到测试文件中时，我在测试文件中未定义它

postMessageData(msg){
        let me = this;
        axios.post('api endpoint', {
            "entry": [  
                {
            "sessionid": me.sessionid,
            "tenantid": "d563cc487b",
            "botid": "9523409096",
            "channel": "Web",
            "OpportunityID": "f63637d7e5",
            "QuoteID": "f63637d7e5",
            "OpportunityName":"service level",
            "UserLegacyID": "f63637d7e5",
            "UserFirstName": "botuser",
            "RequestType": "change service level",
            "messaging": [
                {
                  "message": {
                    "messageId":"276",
                    "text": msg,
                    "timestamp": new Date()
                  },
                  "sender": {
                    "id": "1223",
                    "name": "rajdeep"
                  }
                }
              ]
            }
            ]
          })
          .then(function (response) {
            console.log(response);
            me.sessionid = response.data.sessionId;
            //show loader
            me.setState({ hide: true });
            me.getResponseShow(response);
          })
          .catch(function (error) {
            console.log(error);
          });
    }

我的测试代码是：

it('calls axios and return data', async () => {
    const data =  postMessageData('Hi');
    expect(data.tenantid).toEqual('d563cc487b');
    expect.assertions(1);

})

错误：

ReferenceError: postMessageData is not defined

          53 |
          54 | it('calls axios and return data', async () => {
        > 55 |     const data =  postMessageData('Hi');
             |                ^
          56 |     expect(data.tenantid).toEqual('d563cc487b');
          57 |     expect.assertions(1);