FAQ: Learn TDD With Mocha - Introduction

Frequently Asked Questions JavaScript FAQ
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This community-built FAQ covers the “Introduction” exercise from the lesson “Learn TDD With Mocha”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Web Development

Learn JavaScript Unit Testing

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2

Shouldn’t the test fail when there is nothing in the it block?

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Just popping in to say that this was a nice module! The TDD methodology was well-explained and the exercises were well crafted :cowboy_hat_face:

4

The test fails immediately for me. I know someone else mentioned it should fail without something in the it block, I’m assuming it didn’t fail for them. My problem is knowing even what to do since there’s no code to even look at to generate the test for. My brain is also a little fried. Some guidance would be helpful.

Edit: Nevermind. Figured it out. There is a solution, just be sure to read the test output.

1 Like
5

im learning TDD with mocha and i cant scroll my terminal upwards to view contents. whats the problem

6

In the Rooster Regulation project, I was receiving this error when I was trying to use the assert.throw functionality to test if a function throws an error if a wrong number is passed in as an argument:

TypeError: expected.call is not a function

Upon my research, I realized that this error is usually thrown when the node version is relatively old. Hence, I write this post to inform @codecademy of this issue and to solve it.

const assert = require("assert"); const Rooster = require("../index.js"); //FOR TIME-AT-DAWN - HOUR PASSED < 0 describe("timeAtDawnLesserThanZero", () => { it("throws an error if passed a number less than 0", () => { //SetUp const expectedResult = new RangeError("Number cannot be lesser then 0"); //Exercises and Verifies assert.throws(() => { Rooster.timeAtDawn(-1); }, expectedResult); //Tears Down - Not Needed Here! }); });