fakeEditor needs to return string from getCacheFile (for testing)

test/compiler-test.js

@@ -6,7 +6,8 @@ test('compiler.compile smoke', function (t) {
   t.plan(1);
 
   var noop = function () {};
-  var fakeEditor = {onChangeSetup: noop, clearAnnotations: noop, getValue: noop, setCacheFileContent: noop, getCacheFile: noop};
+  var getCacheFile = function () { return 'fakeCacheFile'; };
+  var fakeEditor = {onChangeSetup: noop, clearAnnotations: noop, getValue: noop, setCacheFileContent: noop, getCacheFile: getCacheFile};
   var fakeOutputField = {empty: noop};
   var fakeQueryParams = {get: function () { return {}; }};
   var compiler = new Compiler(fakeEditor, null, fakeQueryParams, null, fakeOutputField);