example of asynchronous tests with should

gistfile1.js

// assertion passes - test passes

it('[first reply] should give tag with key `position` and value `first_reply`', function (done) {
  messageToInfluxService.process(message2to1, function (err, fields, tags) {
    if (err) return done(err);
    try {
      tags.should.have.property('position', 'first_reply');
      return done();
    } catch (e) {
      return done(e);
    }
  });
});

// assertion passes - test passes (without try catch)

it('[first reply] should give tag with key `position` and value `first_reply`', function (done) {
  messageToInfluxService.process(message2to1, function (err, fields, tags) {
    if (err) return done(err);
    tags.should.have.property('position', 'first_reply');
    return done();
  });
});

// assertion fails - test fails with a proper error

it('[first reply] should give tag with key `position` and value `first_reply`', function (done) {
  messageToInfluxService.process(message2to1, function (err, fields, tags) {
    if (err) return done(err);
    try {
      tags.should.have.property('position', 'first_replay'); // note the different assertion
      return done();
    } catch (e) {
      return done(e);
    }
  });
});

// missing try - catch
// (!) assertion fails - test fails with UnhandledPromiseRejectionWarning printed in console and with timeout

it('[first reply] should give tag with key `position` and value `first_reply`', function (done) {
  messageToInfluxService.process(message2to1, function (err, fields, tags) {
    if (err) return done(err);
    tags.should.have.property('position', 'first_replay');
    return done();
  });
});