flutter/packages/unit/test/engine/replace_child_test.dart

import 'dart:sky';

import 'package:test/test.dart';

import 'dom_utils.dart';

void main() {
  var document = new Document();

  test("should replace elements", () {
    var parent = document.createElement("div");
    var oldChild = parent.appendChild(document.createElement("div"));
    var newChild = document.createElement("div");
    oldChild.replaceWith([newChild]);
    expect(oldChild.parentNode, isNull);
    expect(newChild.parentNode, equals(parent));
  });

  test("should replace text", () {
    var parent = document.createElement("div");
    var oldChild = parent.appendChild(document.createText(" it's a text "));
    var newChild = document.createElement("div");
    oldChild.replaceWith([newChild]);
    expect(oldChild.parentNode, isNull);
    expect(newChild.parentNode, equals(parent));
  });

  test("should replace children with a fragment", () {
    var fragment = document.createDocumentFragment();
    var child1 = fragment.appendChild(document.createElement("div"));
    var child2 = fragment.appendChild(document.createText(" text "));
    var child3 = fragment.appendChild(document.createText(" "));
    var child4 = fragment.appendChild(document.createElement("div"));
    var parent = document.createElement("div");
    var oldChild = parent.appendChild(document.createElement("div"));
    var lastChild = parent.appendChild(document.createElement("div"));
    oldChild.replaceWith([fragment]);
    expect(child1.parentNode, equals(parent));
    expect(child2.parentNode, equals(parent));
    expect(child3.parentNode, equals(parent));
    expect(child4.parentNode, equals(parent));
    expect(oldChild.parentNode, isNull);
    expect(childNodeCount(parent), equals(5));
    expect(childElementCount(parent), equals(3));
    expect(parent.lastChild, equals(lastChild));
  });

  // test("should throw when appending to a text", () {
  //   var parent = new Text();
  //   expect(() {
  //     parent.replaceChild(document.createElement("div"), null);
  //   }, throws);
  // });
}