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const Stack = require('./index');

test('Stack is a class', () => {

expect(typeof Stack.prototype.constructor).toEqual('function');

});

test('stack can add and remove items', () => {

const s = new Stack();

s.push(1);

expect(s.pop()).toEqual(1);

s.push(2);

expect(s.pop()).toEqual(2);

});

test('stack can follows first in, last out', () => {

const s = new Stack();

s.push(1);

s.push(2);

s.push(3);

expect(s.pop()).toEqual(3);

expect(s.pop()).toEqual(2);

expect(s.pop()).toEqual(1);

});

test('peek returns the first element but doesnt pop it', () => {

const s = new Stack();

s.push(1);

s.push(2);

s.push(3);

expect(s.peek()).toEqual(3);

expect(s.pop()).toEqual(3);

expect(s.peek()).toEqual(2);

expect(s.pop()).toEqual(2);

expect(s.peek()).toEqual(1);

expect(s.pop()).toEqual(1);

});