Mocha afterEach

var assert = require('assert');
// A test suite or block for testing sum function
describe('#sum', function () {
  // Test case 1  
  it('sum() adds multiple numbers', function () {
    assert.equals(sum(1, 2, 3), 6);
  });
  // Test case 2  
  it('sum() handles single number', function () {
    assert.equals(sum(3), 3);
  });
  afterEach(function () {
    // Runs after each test in this block
    // Will run once after test case 1 and once
    // after test case 2
    //...
    
  });
});