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Completed test cases for deletion

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	`1`	`+const BinarySearchTree = require('./index');`
	`2`	`+const heightOfBST = require('./height-of-bst/index');`
	`3`	`+`
	`4`	`+describe('Binary search tree traversals', () => {`
	`5`	`+ let bst;`
	`6`	`+`
	`7`	`+ describe('Creates BST', () => {`
	`8`	`+ it('should create BST', () => {`
	`9`	`+ // Creates BST`
	`10`	`+ bst = new BinarySearchTree(6);`
	`11`	`+ bst.add(4);`
	`12`	`+ bst.add(9);`
	`13`	`+ bst.add(2);`
	`14`	`+ bst.add(5);`
	`15`	`+ bst.add(8);`
	`16`	`+ bst.add(12);`
	`17`	`+ });`
	`18`	`+ });`
	`19`	`+`
	`20`	`+ describe('BST node deletions', () => {`
	`21`	`+ it('should check height of bst to be 3 prior deletion', () => {`
	`22`	`+ expect(heightOfBST(bst.root)).toEqual(3);`
	`23`	`+ });`
	`24`	`+`
	`25`	`+ it('deleting leaf element does not affect tree height if it has sibling', () => {`
	`26`	`+ bst.remove(2);`
	`27`	`+ bst.remove(8);`
	`28`	`+ expect(heightOfBST(bst.root)).toEqual(3);`
	`29`	`+ });`
	`30`	`+`
	`31`	`+ it('deleting leaf element does affect tree height if it has no-sibling', () => {`
	`32`	`+ bst.remove(5);`
	`33`	`+ bst.remove(12);`
	`34`	`+ expect(heightOfBST(bst.root)).toEqual(2);`
	`35`	`+ });`
	`36`	`+ });`
	`37`	`+});`

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