Fix js test suite for path change, error if t262 missing

Makefile

@@ -21,9 +21,10 @@ jsjsref: generator
 	$(MAKE) -C jsref
 
 test_init:
+	git submodule update --init test/test262
 	npm install
 
-test: generator
+test: jsjsref
 	node_modules/.bin/mocha
 
 .PHONY: publish jsjsref generator test_init test

test/helpers/test262.js

@@ -38,12 +38,10 @@ before(function(done) {
 
   walk(test262path)
   .pipe(filter.obj(file => file.stats.isFile() && file.path.endsWith(".js")))
-  .on('readable', function() {
-    var item;
-    while((item = this.read())) { tests.push(item.path); }
-  })
+  .on('data', (item) => { tests.push(item.path); })
   .on('end', function() {
     describe("test262", function() {
+      if (tests.length === 0) { throw new Error("Unable to find any test262 tests (uninitialised git submodule?)") }
       tests.forEach(item => {
         describe(item, function() {
           // Preseed test arguments with safe defaults

test/interpreter.js

@@ -2,7 +2,7 @@
 
 var esprima = require('esprima');
 var esprimaToAST = require('../esprima-to-ast.js').esprimaToAST;
-var JsInterpreter = require('../generator/tests/jsref/assembly.js');
+var JsInterpreter = require('../jsref/assembly.js');
 
 require('./parser.js');
 var test262tests = require('./helpers/test262.js');