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Add missing LinkedList tests (trekhleb#151)

Co-authored-by: Oleksii Trekhleb <trehleb@gmail.com>

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Original file line number	Diff line number	Diff line change
`@@ -218,6 +218,29 @@ describe('LinkedList', () => {`
`218`	`218`	`expect(linkedList.find({value:2,customValue:'test5'})).toBeNull();`
`219`	`219`	`});`
`220`	`220`
	`221`	`+it('should find preferring callback over compare function',()=>{`
	`222`	`+constgreaterThan=(value,compareTo)=>(value>compareTo ?0 :1);`
	`223`	`+`
	`224`	`+constlinkedList=newLinkedList(greaterThan);`
	`225`	`+linkedList.fromArray([1,2,3,4,5]);`
	`226`	`+`
	`227`	`+letnode=linkedList.find({value:3});`
	`228`	`+expect(node.value).toBe(4);`
	`229`	`+`
	`230`	`+node=linkedList.find({callback:value=>value<3});`
	`231`	`+expect(node.value).toBe(1);`
	`232`	`+});`
	`233`	`+`
	`234`	`+it('should convert to array',()=>{`
	`235`	`+constlinkedList=newLinkedList();`
	`236`	`+`
	`237`	`+linkedList.append(1);`
	`238`	`+linkedList.append(2);`
	`239`	`+linkedList.append(3);`
	`240`	`+`
	`241`	`+expect(linkedList.toArray().join(',')).toBe('1,2,3');`
	`242`	`+});`
	`243`	`+`
`221`	`244`	`it('should reverse linked list',()=>{`
`222`	`245`	`constlinkedList=newLinkedList();`
`223`	`246`

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