01-first-unit-test.md

1. Setup

git checkout ut-01-karma-jasmine-boilerplate

yarn

2. Run tests

yarn test farmicode --watch

3. Implement first test

3.1. Instructions

Implement and test a function called computeAnimalPrice that returns the animal's price given the following rules:

1. Cats are free.
2. Dogs cost 300.
3. Sheep cost 100.
4. Females are twice the price.

3.2. Files

Function file: apps/farmicode/src/app/compute-animal-price.ts.

Test file: apps/farmicode/src/app/compute-animal-price.spec.ts

Test example

The example below tests the add function. You can use it as a boilerplate.

describe('add', () => {
  it('should return sum', () => {
    const result = add(1, 2);

    expect(result).toEqual(3);
  });
});

4. New rule

Animal prices decrease based on their age.

Every year, the animal's price loses 20% from the initial price.

Update the function.

5. Migrate to Jest

git checkout master
yarn test farmicode --watch