互相运行相同的颤振测试。 1个成功和1个失败

Question

我首先创建Flutter测试，然后遇到2个完全相同的测试，但是只有1个成功。

要点： https://gist.github.com/Mooibroek/bd6c02e5b56e4b03409ee1839a2e0b23

第二个失败并显示此错误：

The following TestFailure object was thrown running a test:
  Expected: exactly one matching node in the widget tree
  Actual: ?:<zero widgets with widget matching predicate (Closure: (dynamic) => bool) (ignoring
  offstage widgets)>
   Which: means none were found but one was expected

When the exception was thrown, this was the stack:
#4      main.<anonymous closure> (file:///Users/nicepants/Projects/flutter/generic_flutter/test/register_test.dart:38:5)
<asynchronous suspension>
#5      testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:108:25)

第38行是我们断言是否找到按钮的行。我在GIST中添加了大多数相关代码，让我知道是否需要更多。

从上次测试中是否有某种隐藏状态？还是这不行。