Fixing syntax error on code example (vuejs#1503)

giubatt · chrisvfritz · commit fc18488df6d6 · 2018-03-19T16:20:58.000-04:00
username: {
   'Lachlan'
}

should be:

username: 'Lachlan'
diff --git a/src/v2/cookbook/unit-testing-vue-components.md b/src/v2/cookbook/unit-testing-vue-components.md
@@ -58,9 +58,7 @@ test('Foo', () => {
 
   // update the name to be long enough
   wrapper.setData({
-    username: {
-      'Lachlan'
-    }
+    username: 'Lachlan'
   })
 
   // assert the error has gone away
