merge: rename SinglyLinkList to SinglyLinkedList (#881)

Data-Structures/Linked-List/test/SinglyLinkedList.test.js

@@ -0,0 +1,166 @@
+import { LinkedList } from '../SinglyLinkedList'
+
+describe('SinglyLinkedList', () => {
+  it('Check addLast', () => {
+    const list = new LinkedList()
+    expect(list.get()).toEqual([])
+
+    list.addLast(1)
+    expect(list.get()).toEqual([1])
+
+    list.addLast(2)
+    expect(list.get()).toEqual([1, 2])
+  })
+
+  it('Check addFirst', () => {
+    const list = new LinkedList()
+    expect(list.get()).toEqual([])
+
+    list.addFirst(1)
+    expect(list.get()).toEqual([1])
+
+    list.addFirst(2)
+    expect(list.get()).toEqual([2, 1])
+  })
+
+  it('Check addAt', () => {
+    const list = new LinkedList()
+    expect(list.get()).toEqual([])
+
+    list.addAt(0, 10)
+    expect(list.get()).toEqual([10])
+
+    list.addAt(1, 20)
+    expect(list.get()).toEqual([10, 20])
+
+    list.addAt(1, 30)
+    expect(list.get()).toEqual([10, 30, 20])
+
+    list.addAt(3, 40)
+    expect(list.get()).toEqual([10, 30, 20, 40])
+  })
+
+  it('Check removeLast', () => {
+    const list = new LinkedList()
+    list.addLast(1)
+    list.addLast(2)
+    expect(list.get()).toEqual([1, 2])
+
+    list.removeLast()
+    expect(list.get()).toEqual([1])
+
+    list.removeLast()
+    expect(list.get()).toEqual([])
+  })
+
+  it('Check removeFirst', () => {
+    const list = new LinkedList()
+    list.addLast(1)
+    list.addLast(2)
+    expect(list.get()).toEqual([1, 2])
+
+    list.removeFirst()
+    expect(list.get()).toEqual([2])
+
+    list.removeFirst()
+    expect(list.get()).toEqual([])
+  })
+
+  it('Check removeAt', () => {
+    const list = new LinkedList()
+    list.addLast(10)
+    list.addLast(20)
+    list.addLast(30)
+    list.addLast(40)
+    list.addLast(50)
+    expect(list.get()).toEqual([10, 20, 30, 40, 50])
+
+    list.removeAt(0)
+    expect(list.get()).toEqual([20, 30, 40, 50])
+
+    list.removeAt(3)
+    expect(list.get()).toEqual([20, 30, 40])
+
+    list.removeAt(1)
+    expect(list.get()).toEqual([20, 40])
+  })
+
+  it('Check remove', () => {
+    const list = new LinkedList()
+    list.addLast(10)
+    list.addLast(20)
+    list.addLast(30)
+    expect(list.get()).toEqual([10, 20, 30])
+
+    list.remove(20)
+    expect(list.get()).toEqual([10, 30])
+
+    list.remove(30)
+    expect(list.get()).toEqual([10])
+  })
+
+  it('Check indexOf', () => {
+    const list = new LinkedList()
+    list.addLast(10)
+    list.addLast(20)
+    list.addLast(30)
+    list.addLast(40)
+    list.addLast(50)
+    expect(list.indexOf(10)).toBe(0)
+    expect(list.indexOf(30)).toBe(2)
+    expect(list.indexOf(50)).toBe(4)
+    expect(list.indexOf(70)).toBe(-1)
+  })
+
+  it('Check elementAt', () => {
+    const list = new LinkedList()
+    list.addLast(10)
+    list.addLast(20)
+    list.addLast(30)
+    list.addLast(40)
+    list.addLast(50)
+    expect(list.elementAt(0)).toBe(10)
+    expect(list.elementAt(1)).toBe(20)
+    expect(list.elementAt(3)).toBe(40)
+    expect(list.elementAt(4)).toBe(50)
+  })
+
+  it('Check isEmpty', () => {
+    const list = new LinkedList()
+    expect(list.isEmpty()).toBe(true)
+    list.addLast(10)
+    list.addLast(20)
+    list.addLast(30)
+    list.addLast(40)
+    list.addLast(50)
+    expect(list.isEmpty()).toBe(false)
+  })
+
+  it('Check head', () => {
+    const list = new LinkedList()
+    expect(list.head()).toBe(null)
+
+    list.addLast(10)
+    expect(list.head()).toBe(10)
+
+    list.addLast(20)
+    expect(list.head()).toBe(10)
+
+    list.addFirst(30)
+    expect(list.head()).toBe(30)
+  })
+
+  it('Check size', () => {
+    const list = new LinkedList()
+    expect(list.size()).toBe(0)
+
+    list.addLast(10)
+    expect(list.size()).toBe(1)
+
+    list.addLast(20)
+    expect(list.size()).toBe(2)
+
+    list.removeFirst()
+    expect(list.size()).toBe(1)
+  })
+})