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
22 lines
586 B
JavaScript
22 lines
586 B
JavaScript
const {shank} = require('./_30s.js');
|
|
|
|
test('shank is a Function', () => {
|
|
expect(shank).toBeInstanceOf(Function);
|
|
});
|
|
|
|
const names = ['alpha', 'bravo', 'charlie'];
|
|
|
|
test('Returns an array with the added elements.', () => {
|
|
expect(shank(names, 1, 0, 'delta')).toEqual(['alpha', 'delta', 'bravo', 'charlie']);
|
|
});
|
|
|
|
test('Returns an array with the removed elements.', () => {
|
|
expect(shank(names, 1, 1)).toEqual(['alpha', 'charlie']);
|
|
});
|
|
|
|
test('Does not mutate the original array', () => {
|
|
shank(names, 1, 0, 'delta');
|
|
expect(names).toEqual(['alpha', 'bravo', 'charlie']);
|
|
});
|
|
|