83a6a6ea32
* chore: make aware eslint that we use jest By setting up the jest environment, we no longer need to declare the 'test' global in the configuration. * chore: don't need to import expect, it's a jest environment global * chore: don't need to import expect when creating undefined test
18 lines
581 B
JavaScript
18 lines
581 B
JavaScript
const {none} = require('./_30s.js');
|
|
|
|
test('none is a Function', () => {
|
|
expect(none).toBeInstanceOf(Function);
|
|
});
|
|
test('Returns true for arrays with no truthy values', () => {
|
|
expect(none([0, undefined, NaN, null, ''])).toBeTruthy();
|
|
});
|
|
test('Returns false for arrays with at least one truthy value', () => {
|
|
expect(none([0, 1])).toBeFalsy();
|
|
});
|
|
test('Returns true with a predicate function', () => {
|
|
expect(none([4, 1, 0, 3], x => x < 0)).toBeTruthy();
|
|
});
|
|
test('Returns false with predicate function', () => {
|
|
expect(none([0, 1, 2], x => x === 1)).toBeFalsy();
|
|
});
|