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diff --git a/lib/epub.js/test/core.js b/lib/epub.js/test/core.js
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+++ b/lib/epub.js/test/core.js
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+import assert from 'assert';
+import Url from '../src/utils/url';
+import Path from '../src/utils/path';
+
+describe('Core', function() {
+
+
+	before(function(){
+
+	});
+
+
+	describe('Url', function () {
+
+		it("Url()", function() {
+			var url = new Url("http://example.com/fred/chasen/derf.html");
+
+			assert.equal( url.href, "http://example.com/fred/chasen/derf.html" );
+			assert.equal( url.directory, "/fred/chasen/" );
+			assert.equal( url.extension, "html" );
+			assert.equal( url.filename, "derf.html" );
+			assert.equal( url.origin, "http://example.com" );
+			assert.equal( url.protocol, "http:" );
+			assert.equal( url.search, "" );
+		});
+
+		describe('#resolve()', function () {
+			it("should join subfolders", function() {
+				var a = "http://example.com/fred/chasen/";
+				var b = "ops/derf.html";
+
+				var resolved = new Url(a).resolve(b);
+				assert.equal( resolved, "http://example.com/fred/chasen/ops/derf.html" );
+			});
+
+			it("should resolve up a level", function() {
+				var a = "http://example.com/fred/chasen/index.html";
+				var b = "../derf.html";
+
+				var resolved = new Url(a).resolve(b);
+				assert.equal( resolved, "http://example.com/fred/derf.html" );
+			});
+
+			it("should resolve absolute", function() {
+				var a = "http://example.com/fred/chasen/index.html";
+				var b = "/derf.html";
+
+				var resolved = new Url(a).resolve(b);
+				assert.equal( resolved, "http://example.com/derf.html" );
+			});
+
+			it("should resolve with search strings", function() {
+				var a = "http://example.com/fred/chasen/index.html?debug=true";
+				var b = "/derf.html";
+
+				var resolved = new Url(a).resolve(b);
+				assert.equal( resolved, "http://example.com/derf.html" );
+			});
+
+			// Doesn't work with path.parse
+			xit("should handle directory with a dot", function() {
+				var a = "http://example.com/fred/chasen/index.epub/";
+
+				var url = new Url(a);
+				assert.equal( url.directory, "/fred/chasen/index.epub/" );
+				assert.equal( url.extension, "" );
+			});
+
+			it("should handle file urls", function() {
+				var url = new Url("file:///var/mobile/Containers/Data/Application/F47E4434-9B98-4654-93F1-702336B08EE6/Documents/books/moby-dick/derf.html");
+
+				assert.equal( url.href, "file:///var/mobile/Containers/Data/Application/F47E4434-9B98-4654-93F1-702336B08EE6/Documents/books/moby-dick/derf.html" );
+				assert.equal( url.directory, "/var/mobile/Containers/Data/Application/F47E4434-9B98-4654-93F1-702336B08EE6/Documents/books/moby-dick/" );
+				assert.equal( url.extension, "html" );
+				assert.equal( url.filename, "derf.html" );
+				assert.equal( url.origin, "file://" ); // origin should be blank
+				assert.equal( url.protocol, "file:" );
+				assert.equal( url.search, "" );
+			});
+
+			it("should resolve with file urls", function() {
+				var a = "file:///var/mobile/Containers/Data/Application/books/";
+				var b = "derf.html";
+
+				var resolved = new Url(a).resolve(b);
+				assert.equal( resolved, "file:///var/mobile/Containers/Data/Application/books/derf.html" );
+			});
+
+		});
+	});
+
+	describe('Path', function () {
+
+		it("Path()", function() {
+			var path = new Path("/fred/chasen/derf.html");
+
+			assert.equal( path.path, "/fred/chasen/derf.html" );
+			assert.equal( path.directory, "/fred/chasen/" );
+			assert.equal( path.extension, "html" );
+			assert.equal( path.filename, "derf.html" );
+		});
+
+		it("Strip out url", function() {
+			var path = new Path("http://example.com/fred/chasen/derf.html");
+
+			assert.equal( path.path, "/fred/chasen/derf.html" );
+			assert.equal( path.directory, "/fred/chasen/" );
+			assert.equal( path.extension, "html" );
+			assert.equal( path.filename, "derf.html" );
+		});
+
+		describe('#parse()', function () {
+			it("should parse a path", function() {
+				var path = Path.prototype.parse("/fred/chasen/derf.html");
+
+				assert.equal( path.dir, "/fred/chasen" );
+				assert.equal( path.base, "derf.html" );
+				assert.equal( path.ext, ".html" );
+			});
+
+			it("should parse a relative path", function() {
+				var path = Path.prototype.parse("fred/chasen/derf.html");
+
+				assert.equal( path.dir, "fred/chasen" );
+				assert.equal( path.base, "derf.html" );
+				assert.equal( path.ext, ".html" );
+			});
+		});
+
+		describe('#isDirectory()', function () {
+			it("should recognize a directory", function() {
+				var directory = Path.prototype.isDirectory("/fred/chasen/");
+				var notDirectory = Path.prototype.isDirectory("/fred/chasen/derf.html");
+
+				assert(directory, "/fred/chasen/ is a directory" );
+				assert(!notDirectory, "/fred/chasen/derf.html is not directory" );
+			});
+		});
+
+		describe('#resolve()', function () {
+
+			it("should resolve a path", function() {
+				var a = "/fred/chasen/index.html";
+				var b = "derf.html";
+
+				var resolved = new Path(a).resolve(b);
+				assert.equal(resolved, "/fred/chasen/derf.html" );
+			});
+
+			it("should resolve a relative path", function() {
+				var a = "fred/chasen/index.html";
+				var b = "derf.html";
+
+				var resolved = new Path(a).resolve(b);
+				assert.equal(resolved, "/fred/chasen/derf.html" );
+			});
+
+			it("should resolve a level up", function() {
+				var a = "/fred/chasen/index.html";
+				var b = "../derf.html";
+
+				var resolved = new Path(a).resolve(b);
+				assert.equal(resolved, "/fred/derf.html" );
+			});
+
+		});
+
+		describe('#relative()', function () {
+
+			it("should find a relative path at the same level", function() {
+				var a = "/fred/chasen/index.html";
+				var b = "/fred/chasen/derf.html";
+
+				var relative = new Path(a).relative(b);
+				assert.equal(relative, "derf.html" );
+			});
+
+			it("should find a relative path down a level", function() {
+				var a = "/fred/chasen/index.html";
+				var b = "/fred/chasen/ops/derf.html";
+
+				var relative = new Path(a).relative(b);
+				assert.equal(relative, "ops/derf.html" );
+			});
+
+			it("should resolve a level up", function() {
+				var a = "/fred/chasen/index.html";
+				var b = "/fred/derf.html";
+
+				var relative = new Path(a).relative(b);
+				assert.equal(relative, "../derf.html" );
+			});
+
+		});
+
+
+	});
+
+});