// function to be tested 

async function attachFile(req, res) {
  const requestPayload = new FormData();
  const fileName = req.swagger.params.name.value
  const description = req.swagger.params.description.value;
  const email = req.swagger.params.email.value;
  const customerId = req.swagger.params.customerId.value;


  requestPayload.append('ticketId', req.swagger.params.ticketId.value);
  requestPayload.append('file', req.swagger.params.file.value.buffer, `${customerId}_${fileName}`);
  requestPayload.append('description', `${customerId}_${description}`);

Try {
// call third party API with data 
}catch(error){
 // handle exception case 
}

}


// test case  details 


   beforeEach(() => {
    sandbox.restore();
    formDataAppendSpy = sandbox.spy(FormData.prototype, 'append');
  });
 


      it('should return an ID in response', async () => {
        return request
          .post('/v1/api/attachments')
          .set('Content-Type', 'multipart/form-data')
          .query({ email, customerId })
          .field('ticketId', ticketId)
          .field('description', description)
          .field(‘name’,’sampleName’)
          .expect(200)
          .then(() => {
            expect(formDataAppendSpy).to.be.calledWith('ticketId', ticketId);
            expect(formDataAppendSpy).to.be.calledWith(‘name', ‘sampleName’);
            expect(formDataAppendSpy).to.be.calledWith('description', `${customerId}_${description}`);
            expect(formDataAppendSpy).to.be.callCount(3)

          });
      }).timeout(TIMEOUT);