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test(reversingAnArray): add tests

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	`1`	`+import { reverseArray, reverseArrayInPlace } from '../reversingAnArray'`
	`2`	`+`
	`3`	`+const originalArray = [1, 2, 3, 4, 5]`
	`4`	`+const expected = [5, 4, 3, 2, 1]`
	`5`	`+`
	`6`	`+describe('reverseArray', () => {`
	`7`	`+ test('preserves the original array', () => {`
	`8`	`+ expect(reverseArray(originalArray)).toStrictEqual(expected)`
	`9`	`+ expect(originalArray).toStrictEqual([1, 2, 3, 4, 5])`
	`10`	`+ })`
	`11`	`+})`
	`12`	`+`
	`13`	`+describe('reverseArrayInPlace', () => {`
	`14`	`+ test('returns undefined', () => {`
	`15`	`+ expect(reverseArrayInPlace(originalArray)).toBe(undefined)`
	`16`	`+ })`
	`17`	`+`
	`18`	`+ test('modifies the original array', () => {`
	`19`	`+ expect(originalArray).toStrictEqual(expected)`
	`20`	`+ })`
	`21`	`+})`

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