Looking to transform the promise value within a chai-as-promised statement

There’s a promise that resolves to an object which has a method called .toString that needs to be tested. Unfortunately, the current expression fails because the promise is an object being compared to a string:

chai.expect(mypromise).to.eventually.be.equal('1.4')

In order to make this work, we need to call mypromise.toString() and incorporate it before reaching the equal('1.4') function. Is there a way to achieve this?

Answer №1

assert.equal(mypromise.toString(), '1.4');

Note:

A more robust way to handle this situation is by chaining your assertion within a then block. Here's an example:

mypromise.then(function (result) {
    return result.toString();
}).then(function (value) {
    assert.equal(value, '1.4');
});

This approach should work in theory, although I haven't had the opportunity to validate it myself.

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