node/test/pseudo-tty/test-assert-no-color.js

'use strict';
require('../common');
const assert = require('assert').strict;

process.env.NODE_DISABLE_COLORS = true;

assert.throws(
  () => {
    assert.deepStrictEqual({}, { foo: 'bar' });
  },
  {
    message: 'Expected values to be strictly deep-equal:\n' +
      '+ actual - expected\n' +
      '\n' +
      '+ {}\n' +
      '- {\n' +
      '-   foo: \'bar\'\n' +
      '- }',
  });