README.md

Introduction to TDD & Unit Testing

Objectives

1. Learn the tools
2. Write a test on existing code
3. Add tests

Exercise A

Find and open the /coverage/reports/lcov-report/index.html and navigate the file.

You can re-run tests individually by running:

$ grunt test

This command will also refresh the coverage report. Note that the you can run these commands automatically via the watch command:

$ grunt watch
>
> Running "watch" task
> Waiting...

This is the baseline you want for all of your tests going forward.

As you make any changes to TypeScript files, you should see this command trigger events automatically. For example, try adding a space to /src/exercise1/word.ts and save it. You will see the watch recompile the TypeScript and run all tests.

Exercise B

Right now, we actually do not have 100% coverage; some test coverage analysis is being suppressed. Edit word.ts; remove the line about istanbul ignore that looks like this:

/* istanbul ignore next */

By removing this line, the class defined below it will begin to count against the code coverage reports. You should notice your code coverage is no longer at 100%.

Add a test for the removeVowels() method. The test should go to /test/exercise1/word.ts

You should see the coverage report edge back up to ~90%. The exercise 1 coverage report should show the removeVowels method fully covered (green). But you will notice removeNumbers() is still red and it is causing coverage to fall below 100%.

Exercise C

Add a test for the removeNumbers() method. The test should go to /test/exercise1/word.ts

Note that you want to write the test, that will fail. This is because we have not yet added the logic for removeNumbers(). Make sure it fails first.

After you've written the test, update the removeNumbers() method so that it has the appropriate logic. Your test should pass.

You are done when all tests pass and coverage is 100%.