The version that requires fixing :).

katas/es6/language/arrow-functions/basics.js

@@ -11,22 +11,22 @@ describe('arrow functions', function() {
   });
 
   it('a single expression, without curly braces returns too', function() {
-    var func = () => 'I return too';
+    var func = () => {'I return too'};
     assert.equal(func(), 'I return too');
   });
 
   it('one parameter can be written without parens', () => {
-    var func = param => param+1;
+    var func = p => param - 1;
     assert.equal(func(23), 24);
   });
 
   it('many params require parens', () => {
-    var func = (param, param1) => param + param1;
+    var func = param => param + param1;
     assert.equal(func(23, 42), 23+42);
   });
 
   it('body needs parens to return an object', () => {
-    var func = () => ({iAm: 'an object'});
+    var func = () => {iAm: 'an object'};
     assert.deepEqual(func(), {iAm: 'an object'});
   });