17 lines
470 B
JavaScript
17 lines
470 B
JavaScript
const expect = require('expect');
|
|
const {sample} = require('./_30s.js');
|
|
|
|
test('sample is a Function', () => {
|
|
expect(sample).toBeInstanceOf(Function);
|
|
});
|
|
const arr = [3, 7, 9, 11];
|
|
test('Returns a random element from the array', () => {
|
|
expect(arr.includes(sample(arr))).toBeTruthy();
|
|
});
|
|
test('Works for single-element arrays', () => {
|
|
expect(sample([1])).toBe(1);
|
|
});
|
|
test('Returns undefined for empty array', () => {
|
|
expect(sample([])).toBe(undefined);
|
|
});
|