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Improve test-coverage for red-black tree.

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Original file line number	Diff line number	Diff line change
`@@ -285,4 +285,30 @@ describe('RedBlackTree', () => {`
`285`	`285`	`expect(tree.isNodeRed(node3)).toBeTruthy();`
`286`	`286`	`expect(tree.isNodeRed(node6)).toBeTruthy();`
`287`	`287`	`});`
	`288`	`+`
	`289`	`+ it('should do left-left rotation with left grand-parent', () => {`
	`290`	`+ const tree = new RedBlackTree();`
	`291`	`+`
	`292`	`+ tree.insert(20);`
	`293`	`+ tree.insert(15);`
	`294`	`+ tree.insert(25);`
	`295`	`+ tree.insert(10);`
	`296`	`+ tree.insert(5);`
	`297`	`+`
	`298`	`+ expect(tree.toString()).toBe('5,10,15,20,25');`
	`299`	`+ expect(tree.root.height).toBe(2);`
	`300`	`+ });`
	`301`	`+`
	`302`	`+ it('should do right-right rotation with left grand-parent', () => {`
	`303`	`+ const tree = new RedBlackTree();`
	`304`	`+`
	`305`	`+ tree.insert(20);`
	`306`	`+ tree.insert(15);`
	`307`	`+ tree.insert(25);`
	`308`	`+ tree.insert(17);`
	`309`	`+ tree.insert(19);`
	`310`	`+`
	`311`	`+ expect(tree.toString()).toBe('15,17,19,20,25');`
	`312`	`+ expect(tree.root.height).toBe(2);`
	`313`	`+ });`
`288`	`314`	`});`

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