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describe(‘given a unary function’, () => {
  test(‘returns a function that returns the same result for the same input’, () => {
    const double = n => n * 2;
    const _double = memoize(double);
    expect(_double(3)).toBe(double(3));
    expect(_double(3)).toBe(double(3));
    expect(_double(3)).toBe(double(3));
  });
  test(‘calls the given function only once for the same input’, () => {
    let count = 0;
    const updateCount = n => count += n;
    const _updateCount = memoize(updateCount);
    _updateCount(1);
    _updateCount(1);
    _updateCount(1);
    expect(count).toBe(1);
  });
});