promisify-aws-lambda

A tiny utility library to wrap up AWS Lambda functions in Promises.

Why?

Primarily for testing. Mocha accepts promises as part of a test, so this helps us streamline testing AWS lambda functions, like so:

var handler = function(event, context) {
    if (event.workCorrectly) {
        context.done(null, {worked: true});
    } else {
        context.done({worked: false});
    }
}

it("passes", function() {
    return PromisifyLambda(lambda, {
        workCorrectly: true
    })
    .then(function(response) {
        assert.equal(response.worked, true);
    })
});

it("fails", function() {
    return PromisifyLambda(lambda, {
        workCorrectly: false
    })
    .catch(function(response) {
        assert.equal(response.worked, false);
    })
});