<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test-pre.js"></script>
<script>
description("Tests parameters of document.createTreeWalker() API.");

debug("No parameters");
shouldThrow("document.createTreeWalker()", "'TypeError: Not enough arguments'");

debug("")
debug("Null root node");
shouldThrow("document.createTreeWalker(null)", "'TypeError: Argument 1 (\\'root\\') to Document.createTreeWalker must be an instance of Node'");

debug("");
debug("Default parameters");
evalAndLog("walker = document.createTreeWalker(document)");
shouldBe("walker.root", "document");
shouldBe("walker.currentNode", "document");
shouldBe("walker.whatToShow", "0xFFFFFFFF");
shouldBeNull("walker.filter");

debug("");
debug("Passing null for optional parameters");
evalAndLog("walker = document.createTreeWalker(document, null, null)");
shouldBe("walker.root", "document");
shouldBe("walker.currentNode", "document");
shouldBe("walker.whatToShow", "0");
shouldBeNull("walker.filter");

debug("");
debug("Passing undefined for optional parameters");
evalAndLog("walker = document.createTreeWalker(document, undefined, undefined)");
shouldBe("walker.root", "document");
shouldBe("walker.currentNode", "document");
shouldBe("walker.whatToShow", "0xFFFFFFFF");
shouldBeNull("walker.filter");

</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>