Jest - test same objects and use expect.extend for logging detailed error message.

testSameObjects.spec.ps

const firstArray = [{}, {}, {}];
const secondArray = [firstArray[0], {}, firstArray[2]];

test('Objects should be the same', () => {
  expect.extend({
    toBeSameObject(received, errMsg) {
      const result = {
        pass: received,
        message: () => errMsg
      };
      return result;
    }
  });
  firstArray.forEach((e, i) => {
    const errMsg = `
      Objects are different.
      First value: ${JSON.stringify(e)}
      Second value: ${JSON.stringify(secondArray[i])}
      Index: ${i}
    `;
    expect(e === secondArray[i]).toBeSameObject(errMsg);
  });
});