code: function deepEqual(actual, expected, message) {
      if (isDeepEqual(actual, expected)) {
        this.pass(message);
      }
      else {
        this.fail({
          actual: actual,
          expected: expected,
          message: message,
          operator: "deepEqual"
        });
      }
    }
docs: The equivalence assertion tests a deep (with `===`) equality relation.
  @example
  assert.deepEqual({ a: "foo" }, { a: "foo" }, "equivalent objects")