Added vulcanize under third_party/npm_modules

node_modules/vulcanize/node_modules/whacko/node_modules/CSSselect/node_modules/domutils/test/tests/helpers.js

Index: node_modules/vulcanize/node_modules/whacko/node_modules/CSSselect/node_modules/domutils/test/tests/helpers.js
diff --git a/node_modules/vulcanize/node_modules/whacko/node_modules/CSSselect/node_modules/domutils/test/tests/helpers.js b/node_modules/vulcanize/node_modules/whacko/node_modules/CSSselect/node_modules/domutils/test/tests/helpers.js
new file mode 100644
index 0000000000000000000000000000000000000000..c418dd4fb2d5327a152109a361953823c93738a5
--- /dev/null
+++ b/node_modules/vulcanize/node_modules/whacko/node_modules/CSSselect/node_modules/domutils/test/tests/helpers.js
@@ -0,0 +1,29 @@
+var makeDom = require("../utils").makeDom;
+var assert = require("assert");
+
+describe("helpers", function() {
+	describe("removeSubsets", function() {
+		var removeSubsets = require("../..").removeSubsets;
+		var dom = makeDom("<div><p><span></span></p><p></p></div>")[0];
+
+		it("removes identical trees", function() {
+			var matches = removeSubsets([dom, dom]);
+			assert.equal(matches.length, 1);
+		});
+
+		it("Removes subsets found first", function() {
+			var matches = removeSubsets([dom, dom.children[0].children[0]]);
+			assert.equal(matches.length, 1);
+		});
+
+		it("Removes subsets found last", function() {
+			var matches = removeSubsets([dom.children[0], dom]);
+			assert.equal(matches.length, 1);
+		});
+
+		it("Does not remove unique trees", function() {
+			var matches = removeSubsets([dom.children[0], dom.children[1]]);
+			assert.equal(matches.length, 2);
+		});
+	});
+});