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test(linked-list): more coverage

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Original file line number	Diff line number	Diff line change
`@@ -116,6 +116,12 @@ describe('LinkedList Test', () => {`
`116`	`116`	`linkedList.addLast('found');`
`117`	`117`	`});`
`118`	`118`
	`119`	`+ describe('#length', () => {`
	`120`	`+ it('should have length property', () => {`
	`121`	`+ expect(linkedList.length).toBe(2);`
	`122`	`+ });`
	`123`	`+ });`
	`124`	`+`
`119`	`125`	`describe('#indexOf', () => {`
`120`	`126`	`it('should find element index', () => {`
`121`	`127`	`expect(linkedList.indexOf(0)).toBe(0);`
`@@ -203,6 +209,20 @@ describe('LinkedList Test', () => {`
`203`	`209`	`expect(linkedList.size).toBe(2);`
`204`	`210`	`});`
`205`	`211`	`});`
	`212`	`+`
	`213`	`+ describe('#removeByPosition', () => {`
	`214`	`+ it('should remove last element', () => {`
	`215`	`+ expect(linkedList.length).toBe(2);`
	`216`	`+ expect(linkedList.removeByPosition(1)).toBe('found');`
	`217`	`+ expect(linkedList.length).toBe(1);`
	`218`	`+ });`
	`219`	`+`
	`220`	`+ it('should remove last element', () => {`
	`221`	`+ expect(linkedList.length).toBe(2);`
	`222`	`+ expect(linkedList.removeByPosition(0)).toBe(0);`
	`223`	`+ expect(linkedList.length).toBe(1);`
	`224`	`+ });`
	`225`	`+ });`
`206`	`226`	`});`
`207`	`227`
`208`	`228`	`describe('Doubly Linked List and aliases', () => {`

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