Setup:

• First fork, then clone this repository; you'll be able to push your changes back up to your forked repository in the near future.

Lab Exercise 1

View exercise 1...

Project Summary

Review the tests in /src/__tests__/newFunction.test.ts.

• You'll notice the line:

  import { myFunction } from "../newFunction";

• The tests run against the function that /src/newFunction.ts exports, which is blank for now.

Instructions

• Edit the function myFunction in /src/newFunction.ts to pass the tests in /src/__tests__/newFunction.test.ts
• Execute the tests by running the command jest newFunction
• If the tests fail, review your error messages, and correct your function; you do not need to edit the tests.

Submission

Copy and paste the content of newFunction.ts (NOT newFunction.test.ts) into Canvas to submit this assignment.

Lab Exercise 2

View exercise 2...

Project Summary

Your organization is in need of a date formatting function. To get som epractice with unit testing and TDD, they have assigned you to write unit tests for the dateFormat function.

Unlike the previous exercise, neither the function, nor the tests have been set up already.

Instructions

• Create a new test file, /src/__tests__/dateFormat.test.ts
• Add the mock function your developer gave you:

  function dateFormat(shortDate: string): string {
    // this function will accept a numeric short date:
    // MM-DD-YYYY
    // and will return a long date, for example:
    // "2-5-2019" => "February 5, 2019"
    // "11-12-2022" => "November 12, 2022"
    return "";
  }

• Add a describe block, and then tests.
  • The comments in the code should give you everything you need for the function's requirements.
  • The tests from the prior exercise should give you a format to follow for your tests.

Submission

Copy and paste the content of your dateFormat.test.ts into Canvas to submit this assignment.

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Solution

You can review this repository's solution branch to view a working function for lab exercise 1, and the tests for lab exercise 2 as well.

Review

Writing tests against requirements, or code against existing tests, that's the core of TDD, and now you have experience with both.

While you won't often write TDD unit tests (UI automation is more common for QA), these exercises will help you to understand your developers' code, and you can always check into what they test to inform your own tests.

Expand each exercise above for specific requirements, and don't forget to submit your assignments. Good work!

Contributions

If you see a problem or a typo, please fork, make the necessary changes, and create a pull request so we can review your changes and merge them into the master repo and branch.

Copyright

© DevMountain LLC, 2020. Unauthorized use and/or duplication of this material without express and written permission from DevMountain, LLC is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to DevMountain with appropriate and specific direction to the original content.