berkebatman/test-doubles

Demonstrating dummies, mocks, stubs and spies in Jest

Test Doubles

Example tests demonstrating using the magical jest.fn() to create dummies, mocks, stubs and spies.

The Kennel constructor function expects objects in the animals array to conform to an interface, which the Animal constructor implements.

Using jest.fn, we can test the Kennel constructor in isolation without relying on any external implementations of the expected interface (i.e. Animal)

Setup

• clone the repository: git clone git@github.com:MCRcodes/test-doubles.git
• install dependencies: npm install

Running Tests

• npm test runs the unit tests with Jest