old_contents: import { PlayerModel } from './';
  
  describe(`model:: <PlayerModel/>`, () => {
      const model = new PlayerModel();
      const dataProvider = [
          { id: 1, email: 'example1@example.com' },
          { id: 2, email: 'example2@example.com' },
      ];
  
      describe(`::constructor`, () => {
          it(`mandatory fields [id|username|email|byteSeq] should be initialized`, () => {
              expect(model.id).toBeDefined();
              expect(model.name).toBeDefined();
              expect(model.byteSeq).toBeDefined();
              expect(model.byteSeq).toBe(0);
          });
      });
  
      describe(`::getters/setters`, () => {
          dataProvider.forEach((el) => {
              it(`::(get|set)Id - value "${el.id}" should be encapsulated`, () => {
                  model.setId(el.id);
                  expect(model.getId()).toBe(el.id)
              });
  
              it(`::(get|set)Name - value "${el.email}" should be encapsulated`, () => {
                  model.setName(el.email);
                  expect(model.getName()).toBe(el.email)
              });
          });
      });
  });
  
new_contents: import { PlayerModel } from './';
  
  describe(`model:: <PlayerModel/>`, () => {
      const model = new PlayerModel();
      const dataProvider = [
          { id: 1, email: 'example1@example.com' },
          { id: 2, email: 'example2@example.com' },
      ];
  
      describe(`::constructor`, () => {
          it(`mandatory fields [id|username|email|byteSeq] should be initialized`, () => {
              expect(model.id).toBeDefined();
              expect(model.name).toBeDefined();
              expect(model.byteSeq).toBeDefined();
              expect(model.byteSeq).toBe(0);
          });
      });
  
      describe(`::getters/setters`, () => {
          dataProvider.forEach((el) => {
              it(`::(get|set)Id - value "${el.id}" should be encapsulated`, () => {
                  model.setId(el.id);
                  expect(model.getId()).toBe(el.id);
              });
  
              it(`::(get|set)Name - value "${el.email}" should be encapsulated`, () => {
                  model.setName(el.email);
                  expect(model.getName()).toBe(el.email);
              });
          });
      });
  });
  
subject: Update player_model.test.js