given2

Given2 ^{:exclamation:WIP:exclamation:}

inspired by given.js and Rspec

Use given to define a memoized helper method. The value will be cached across multiple calls in the same example but not across examples.

Note that given is lazy-evaluated: it is not evaluated until the first time the method it defines is invoked.

Usage

let count = 0;

describe('given', () => {
  given('count', () => count += 1);

  it('memoizes the value', () => {
    expect(given.count).toBe(1);
    expect(given.count).toBe(1);
  });

  it('is not cached across examples', () => {
    expect(given.count).toBe(2);
  });
});