Clean up child checks in ContainerNode.

sky/tests/dom/replaceChild.sky

+<sky>
+<import src="../resources/chai.sky" />
+<import src="../resources/mocha.sky" />
+<import src="../resources/dom-utils.sky" as="DomUtils" />
+<script>
+describe("replaceChild", function() {
+  var childElementCount = DomUtils.childElementCount;
+  var childNodeCount = DomUtils.childNodeCount;
+
+  it("should throw with invalid arguments", function() {
+    var parent = document.createElement("div");
+    assert.throws(function() {
+      parent.replaceChild();
+    });
+    assert.throws(function() {
+      parent.replaceChild(null, null);
+    });
+    assert.throws(function() {
+      parent.replaceChild({tagName: "div"});
+    });
+    assert.throws(function() {
+      parent.replaceChild(null, document.createElement("div"));
+    });
+    assert.throws(function() {
+      parent.replaceChild(document.createElement("div"), {tagName: "div"});
+    });
+  });
+
+  it("should replace elements", function() {
+    var parent = document.createElement("div");
+    var oldChild = parent.appendChild(document.createElement("div"));
+    var newChild = document.createElement("div");
+    parent.replaceChild(newChild, oldChild);
+    assert.isNull(oldChild.parentNode);
+    assert.equal(newChild.parentNode, parent);
+  });
+
+  it("should replace text", function() {
+    var parent = document.createElement("div");
+    var oldChild = parent.appendChild(new Text(" it's a text "));
+    var newChild = document.createElement("div");
+    parent.replaceChild(newChild, oldChild);
+    assert.isNull(oldChild.parentNode);
+    assert.equal(newChild.parentNode, parent);
+  });
+
+  it("should replace children with a fragment", function() {
+    var fragment = document.createDocumentFragment();
+    var child1 = fragment.appendChild(document.createElement("div"));
+    var child2 = fragment.appendChild(new Text(" text "));
+    var child3 = fragment.appendChild(new Text(" "));
+    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"));
+    parent.replaceChild(fragment, oldChild);
+    assert.equal(child1.parentNode, parent);
+    assert.equal(child2.parentNode, parent);
+    assert.equal(child3.parentNode, parent);
+    assert.equal(child4.parentNode, parent);
+    assert.isNull(oldChild.parentNode);
+    assert.equal(childNodeCount(parent), 5);
+    assert.equal(childElementCount(parent), 3);
+    assert.equal(parent.lastChild, lastChild);
+  });
+
+  it("should throw when inserting a tree scope", function() {
+    var parent = document.createElement("div");
+    var doc = new Document();
+    var shadowRoot = document.createElement("span").createShadowRoot();
+    assert.throws(function() {
+      parent.replaceChild(doc);
+    });
+    assert.throws(function() {
+      parent.replaceChild(shadowRoot);
+    });
+    assert.throws(function() {
+      doc.replaceChild(fragment);
+    });
+  });
+
+  it("should throw when appending to a text", function() {
+    var parent = new Text();
+    assert.throws(function() {
+      parent.replaceChild(document.createElement("div"), null);
+    });
+  });
+});
+</script>
+</sky>