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stack.test.ts
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import {beforeEach, describe, expect, it} from 'vitest'
import {
CyclicDoublyLinkedList,
Dequeue,
DoublyLinkedList,
IStack,
LinkedList,
LinkedQueue,
LinkedStack,
List,
numberComparator,
PriorityQueue,
Queue,
Stack
} from '../src'
function stackTests(stack: IStack<number>, stackType: new (elements: Iterable<number>) => IStack<number>) {
describe('common tests', () => {
beforeEach(() => {
stack.clear()
})
describe('construct new Stack', () => {
it('from native Array', () => {
const _stack = new stackType([-1, 0, 1])
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from native Set', () => {
const _stack = new stackType(new Set([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from Queue', () => {
const _stack = new stackType(new Queue([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from LinkedQueue', () => {
const _stack = new stackType(new LinkedQueue([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from PriorityQueue', () => {
const _stack = new stackType(new PriorityQueue(numberComparator, [-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from Dequeue', () => {
const _stack = new stackType(new Dequeue([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from Stack', () => {
const _stack = new stackType(new Stack([1, 0, -1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from LinkedStack', () => {
const _stack = new stackType(new LinkedStack([1, 0, -1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from List', () => {
const _stack = new stackType(new List([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from LinkedList', () => {
const _stack = new stackType(new LinkedList([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from DoublyLinkedList', () => {
const _stack = new stackType(new DoublyLinkedList([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
it('from CyclicDoublyLinkedList', () => {
const _stack = new stackType(new CyclicDoublyLinkedList([-1, 0, 1]))
expect(_stack.size).toBe(3)
expect(_stack.pop()).toBe(1)
expect(_stack.pop()).toBe(0)
expect(_stack.pop()).toBe(-1)
expect(_stack.size).toBe(0)
})
})
describe('add elements', () => {
it('should add elements', () => {
expect(stack.isEmpty()).toBeTruthy()
expect(() => stack.pop()).toThrowError('no such element')
stack.push(-1)
stack.push(0)
stack.push(1)
stack.push(2)
stack.push(3)
stack.push(4)
expect(stack.pop()).toBe(4)
expect(stack.pop()).toBe(3)
expect(stack.pop()).toBe(2)
expect(stack.pop()).toBe(1)
expect(stack.pop()).toBe(0)
expect(stack.pop()).toBe(-1)
expect(() => stack.pop()).toThrowError('no such element')
stack.push(-100)
stack.push(-10)
stack.push(-1)
expect(stack.pop()).toBe(-1)
expect(stack.pop()).toBe(-10)
expect(stack.pop()).toBe(-100)
expect(() => stack.pop()).toThrowError('no such element')
stack.push(1)
stack.push(10)
stack.push(100)
expect(stack.pop()).toBe(100)
expect(stack.pop()).toBe(10)
expect(stack.pop()).toBe(1)
expect(() => stack.pop()).toThrowError('no such element')
})
it('should add "null" elements', () => {
stack.push(null!)
expect(stack.size).toBe(1)
expect(stack.top()).toBeNull()
expect(stack.pop()).toBeNull()
expect(stack.size).toBe(0)
stack.push(null!)
stack.push(null!)
expect(stack.size).toBe(2)
expect(stack.top()).toBeNull()
expect(stack.pop()).toBeNull()
expect(stack.pop()).toBeNull()
expect(stack.size).toBe(0)
stack.push(null!)
stack.push(null!)
stack.push(null!)
expect(stack.size).toBe(3)
expect(stack.top()).toBeNull()
expect(stack.pop()).toBeNull()
expect(stack.pop()).toBeNull()
expect(stack.pop()).toBeNull()
expect(stack.size).toBe(0)
expect(() => stack.top()).toThrowError('no such element')
})
it('should not add "undefined" elements', () => {
stack.push(undefined!)
expect(stack.size).toBe(0)
expect(() => stack.top()).toThrowError('no such element')
})
})
it('gets elements', () => {
stack.push(0)
stack.push(1)
stack.push(2)
stack.push(3)
expect(stack.pop()).toBe(3)
expect(stack.pop()).toBe(2)
expect(stack.pop()).toBe(1)
expect(stack.pop()).toBe(0)
})
it('has correct size', () => {
expect(stack.isEmpty()).toBeTruthy()
expect(stack.size).toBe(0)
stack.push(1)
expect(stack.size).toBe(1)
stack.push(2)
expect(stack.size).toBe(2)
stack.push(3)
expect(stack.size).toBe(3)
stack.pop()
expect(stack.size).toBe(2)
stack.pop()
expect(stack.size).toBe(1)
stack.top()
expect(stack.size).toBe(1)
stack.pop()
expect(stack.size).toBe(0)
expect(() => stack.pop()).toThrowError('no such element')
stack.push(-1)
stack.push(0)
stack.push(1)
expect(stack.size).toBe(3)
stack.pop()
expect(stack.size).toBe(2)
stack.top()
expect(stack.size).toBe(2)
stack.pop()
expect(stack.size).toBe(1)
stack.pop()
expect(stack.size).toBe(0)
expect(() => stack.pop()).toThrowError('no such element')
})
it('clears the stack', () => {
expect(stack.isEmpty()).toBeTruthy()
expect(() => stack.pop()).toThrowError('no such element')
stack.push(1)
stack.push(2)
stack.push(3)
expect(stack.size).toBe(3)
stack.clear()
expect(stack.isEmpty()).toBeTruthy()
expect(() => stack.pop()).toThrowError('no such element')
})
it('contains elements', () => {
stack.push(1)
stack.push(-1)
stack.push(0)
stack.push(2)
stack.push(-2)
stack.push(-3)
stack.push(3)
stack.comparator = numberComparator
expect(stack.contains(-4)).toBeFalsy()
expect(stack.contains(-3)).toBeTruthy()
expect(stack.contains(-2)).toBeTruthy()
expect(stack.contains(-1)).toBeTruthy()
expect(stack.contains(0)).toBeTruthy()
expect(stack.contains(1)).toBeTruthy()
expect(stack.contains(2)).toBeTruthy()
expect(stack.contains(3)).toBeTruthy()
expect(stack.contains(4)).toBeFalsy()
})
})
}
function iteratorTest(stack: IStack<number>) {
beforeEach(() => {
stack.clear()
})
it('iterates through stack LIFO', () => {
stack.push(1)
stack.push(2)
stack.push(3)
let results = [1, 2, 3]
expect(stack.size).toBe(3)
for (const number of stack) {
expect(number).toBe(results.pop())
}
expect(stack.size).toBe(3)
expect(results).toHaveLength(0)
results = [1, 2, 3]
for (const number of stack) {
expect(number).toBe(results.pop())
}
expect(stack.size).toBe(3)
expect(results).toHaveLength(0)
stack.clear()
})
}
describe('stacks', () => {
describe('stack backed by native array', () => {
const stack = new Stack<number>()
stackTests(stack, Stack<number>)
iteratorTest(stack)
})
describe('linked stack', () => {
const stack = new LinkedStack<number>()
stackTests(stack, LinkedStack<number>)
iteratorTest(stack)
})
})