I don't understand why my before hook test is failing - node/superagent

let testUser = {username: 'test-user', password: 'test-pass'};
app.use('/api/signup', signup); //this is the route in express


before( done => {
request.post('/api/signup')
.send(testUser)
.then( result => {
  const resultObj = JSON.parse(result.res.text);
  console.log(resultObj);
  testUser.token = resultObj.token;
  testUser.id = resultObj.id;
  return Promise.all([
    request.post('/api/installments').set('token',testUser.token).send(testInstallment),
    request.post('/api/installments').set('token',testUser.token).send(testInstallment1)
  ]);
})
.then( result => {
  testInstallment = JSON.parse(result[0].text);
  testInstallment1 = JSON.parse(result[1].text);
  done();
})
.catch( err => {
  done(err);
});

});

I am trying to test for the signup of a new user. This test had been previously passing, and the functionality even currently works in chrome and postman, but for some reason I can't pass this before test. I keep getting 400 bad request.

I have commented out the code in the .then() to simply see if I could log result, but even that gave me a 400 error. I quite simply don't know what I could have possibly done to get this error.