improve mocha tests (#3195)

test/mocha/with.js

@@ -1,20 +1,20 @@
 var assert = require("assert");
-var uglify = require("../node");
+var UglifyJS = require("../node");
 
 describe("With", function() {
     it("Should throw syntaxError when using with statement in strict mode", function() {
         var code = '"use strict";\nthrow NotEarlyError;\nwith ({}) { }';
         var test = function() {
-            uglify.parse(code);
+            UglifyJS.parse(code);
         }
         var error = function(e) {
-            return e instanceof uglify.JS_Parse_Error &&
-                e.message === "Strict mode may not include a with statement";
+            return e instanceof UglifyJS.JS_Parse_Error
+                && e.message === "Strict mode may not include a with statement";
         }
         assert.throws(test, error);
     });
     it("Should set uses_with for scopes involving With statements", function() {
-        var ast = uglify.parse("with(e) {f(1, 2)}");
+        var ast = UglifyJS.parse("with(e) {f(1, 2)}");
         ast.figure_out_scope();
         assert.equal(ast.uses_with, true);
         assert.equal(ast.body[0].expression.scope.uses_with, true);