13 lines
322 B
JavaScript
13 lines
322 B
JavaScript
const expect = require('expect');
|
|
const isNull = require('./isNull.js');
|
|
|
|
test('isNull is a Function', () => {
|
|
expect(isNull).toBeInstanceOf(Function);
|
|
});
|
|
test('passed argument is a null', () => {
|
|
expect(isNull(null)).toBeTruthy();
|
|
});
|
|
test('passed argument is a null', () => {
|
|
expect(isNull(NaN)).toBeFalsy();
|
|
});
|