Rewrite tests from vows to mocha: util tests

See #140

test/util.mocha.js

@@ -0,0 +1,66 @@
+var assert = require('chai').assert,
+    U = require('../lib/util'),
+    PATH = require('../lib/path');
+
+/**
+ * Mocha BDD interface.
+ *
+ * @name describe @function
+ * @name it @function
+ * @name before @function
+ * @name after @function
+ * @name beforeEach @function
+ * @name afterEach @function
+ */
+
+describe('util', function() {
+
+    describe('getBemTechPath()', function() {
+
+        it("'css' resolves to 'bem/lib/techs/css'", function() {
+            assert.equal(U.getBemTechPath('css'), PATH.unixToOs('bem/lib/techs/css'));
+        });
+
+        it("'custom' resolves to 'bem/lib/tech'", function() {
+            assert.equal(U.getBemTechPath('custom'), PATH.unixToOs('bem/lib/tech'));
+        });
+
+    });
+
+    describe('isRequireable()', function() {
+
+        it("'path' returns true", function() {
+            assert.isTrue(U.isRequireable('path'));
+        });
+
+        it("'unexistent-module' returns false", function() {
+            assert.isFalse(U.isRequireable('unexistent-module'));
+        });
+
+    });
+
+    describe('isPath()', function() {
+
+        it("'/path/to/file' returns true", function() {
+            assert.isTrue(U.isPath(PATH.unixToOs('/path/to/file')));
+        });
+
+        it("'./path/to/file' returns true", function() {
+            assert.isTrue(U.isPath('.' + PATH.unixToOs('/path/to/file')));
+        });
+
+        it("'path/to/file' returns true", function() {
+            assert.isTrue(U.isPath(PATH.unixToOs('path/to/file')));
+        });
+
+        it("'file' returns false", function() {
+            assert.isFalse(U.isPath('file'));
+        });
+
+        it("'file.ext' returns false", function() {
+            assert.isFalse(U.isPath('file.ext'));
+        });
+
+    });
+
+});