fix(add, remove): Make add & remove function parameters optional

.travis.yml

@@ -1,4 +1,11 @@
-script: script/test
 language: node_js
 node_js:
-- '0.10'
+- "lts/*"
+
+install:
+  - wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.8-linux-x86_64.tar.bz2
+  - tar -xvf ./phantomjs-1.9.8-linux-x86_64.tar.bz2
+  - export PATH=$PWD/phantomjs-1.9.8-linux-x86_64/bin:$PATH
+
+script:
+  - npm test

classList.js

@@ -16,7 +16,7 @@ if ("document" in self) {
 // Full polyfill for browsers with no classList support
 // Including IE < Edge missing SVGElement.classList
 if (
-	   !("classList" in document.createElement("_")) 
+	   !("classList" in document.createElement("_"))
 	|| document.createElementNS
 	&& !("classList" in document.createElementNS("http://www.w3.org/2000/svg","g"))
 ) {
@@ -104,14 +104,13 @@ classListProto.add = function () {
 		, token
 		, updated = false
 	;
-	do {
+	while (++i <= l) {
 		token = tokens[i] + "";
 		if (!~checkTokenAndGetIndex(this, token)) {
 			this.push(token);
 			updated = true;
 		}
-	}
-	while (++i < l);
+	};
 
 	if (updated) {
 		this._updateClassName();
@@ -126,7 +125,7 @@ classListProto.remove = function () {
 		, updated = false
 		, index
 	;
-	do {
+	while (++i <= l) {
 		token = tokens[i] + "";
 		index = checkTokenAndGetIndex(this, token);
 		while (~index) {
@@ -135,7 +134,6 @@ classListProto.remove = function () {
 			index = checkTokenAndGetIndex(this, token);
 		}
 	}
-	while (++i < l);
 
 	if (updated) {
 		this._updateClassName();
@@ -260,4 +258,4 @@ if (objCtr.defineProperty) {
 	testElement = null;
 }());
 
-}
+}

tests/tests.js

@@ -80,3 +80,18 @@ QUnit.test("Removes class with second argument", function(assert) {
 		"Returns false when class was not present"
 	);
 });
+
+QUnit.test("Adds no class with no argument", function(assert) {
+	var cList = document.createElement("p").classList;
+
+	cList.add();
+	assert.ok(!cList.contains("c1"), "Adds no class");
+});
+
+QUnit.test("Removes no class with no argument", function(assert) {
+	var cList = document.createElement("p").classList;
+
+	cList.add("c1");
+	cList.remove();
+	assert.ok(cList.contains("c1"), "Removes no class");
+});