Commit c016ce4

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Created some add/remove test cases

Created test cases for add and remove

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	`1`	`+const letters = require('./index');`
	`2`	`+`
	`3`	`+describe('Data Structure : Set', () => {`
	`4`	`+`
	`5`	`+`
	`6`	`+ it('X Set should be a Class', () => {`
	`7`	`+ expect(typeof XSet.prototype.constructor).toEqual('function');`
	`8`	`+ });`
	`9`	`+`
	`10`	`+ describe('Creation of Set', () => {`
	`11`	`+`
	`12`	`+ it('Should create a new Set with no elements', () => {`
	`13`	`+ letters = new XSet();`
	`14`	`+ expect(letters === 0);`
	`15`	`+ });`
	`16`	`+`
	`17`	`+ it('Should add letter A', () => {`
	`18`	`+ letters.add('a');`
	`19`	`+ expect(letters.has('a');`
	`20`	`+ });`
	`21`	`+`
	`22`	`+ it('Should add letter B', () => {`
	`23`	`+ letters.add('b');`
	`24`	`+ expect(letters.has('b');`
	`25`	`+ });`
	`26`	`+`
	`27`	`+ it('Should add letter C', () => {`
	`28`	`+ letters.add('c');`
	`29`	`+ expect(letters.has('c');`
	`30`	`+ });`
	`31`	`+`
	`32`	`+ it('Should remove letter A', () => {`
	`33`	`+ letters.remove('a');`
	`34`	`+ expect(!letters.has('a');`
	`35`	`+ });`
	`36`	`+`
	`37`	`+ it('Should remove letter B', () => {`
	`38`	`+ letters.remove('b');`
	`39`	`+ expect(!letters.has('b');`
	`40`	`+ });`
	`41`	`+`
	`42`	`+`
	`43`	`+ });`

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