UglifyJS/test/mocha/with.js

let assert = require("assert");
let UglifyJS = require("../node");

describe("With", function() {
    it("Should throw syntaxError when using with statement in strict mode", function() {
        let code = '"use strict";\nthrow NotEarlyError;\nwith ({}) { }';
        let test = function() {
            UglifyJS.parse(code);
        }
        let error = function(e) {
            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() {
        let 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.resolve().uses_with, true);
        assert.equal(ast.body[0].body.body[0].body.expression.scope.resolve().uses_with, true);
    });
});