import { Pipe, PipeTransform } from ‘@angular/core‘;@Pipe({  name: ‘filesize‘})export class FileSizePipe implements PipeTransform {  transform(size: number, extension: string = ‘MB‘) {    return (size / (1024 * 1024)).toFixed(2) + extension;  }}

import { FileSizePipe } from ‘./file-size.pipe‘;describe(‘FileSizePipe‘, () => {  describe(‘Isolate FileSizePipe test‘, () => {        const pipe = new FileSizePipe();    it(‘should convert bytes to megabytes‘, () => {      expect(pipe.transform(123456789)).toBe(‘117.74MB‘);      expect(pipe.transform(987654321)).toBe(‘941.90MB‘);    });    it(‘should use the default extension when not supplied‘, () => {      expect(pipe.transform(123456789)).toBe(‘117.74MB‘);      expect(pipe.transform(987654321)).toBe(‘941.90MB‘);    });    it(‘should override the extension when supplied‘, () => {      expect(pipe.transform(123456789, ‘myExt‘)).toBe(‘117.74myExt‘);      expect(pipe.transform(987654321, ‘anotherExt‘)).toBe(‘941.90anotherExt‘);    });  });});