14 lines
386 B
JavaScript
14 lines
386 B
JavaScript
const expect = require('expect');
|
|
const {when} = require('./_30s.js');
|
|
|
|
test('when is a Function', () => {
|
|
expect(when).toBeInstanceOf(Function);
|
|
});
|
|
const doubleEvenNumbers = when(x => x % 2 === 0, x => x * 2);
|
|
test('Returns the proper result', () => {
|
|
expect(doubleEvenNumbers(2)).toBe(4);
|
|
});
|
|
test('Returns the proper result', () => {
|
|
expect(doubleEvenNumbers(1)).toBe(1);
|
|
});
|