The golden test "transparent background" failed: pumpAndSettle timed out

[nickf2k]

The test named "transparent background" failed when I run it. Seem like there is an animation in PinCodeTextField make this error. Below is the LOG of test:

The following assertion was thrown running a test:
pumpAndSettle timed out

When the exception was thrown, this was the stack:
#0      WidgetTester.pumpAndSettle.<anonymous closure> (package:flutter_test/src/widget_tester.dart:724:11)
<asynchronous suspension>
#1      TestAsyncUtils.guard.<anonymous closure> (package:flutter_test/src/test_async_utils.dart:120:7)
<asynchronous suspension>
#2      main.<anonymous closure> (file:///Users/nickf2k/Dev/FlutterProjects/pin_code_fields/test/pin_code_fields_test.dart:66:5)
<asynchronous suspension>
#3      testWidgets.<anonymous closure>.<anonymous closure> (package:flutter_test/src/widget_tester.dart:189:15)
<asynchronous suspension>
#4      TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:1032:5)
<asynchronous suspension>
<asynchronous suspension>
(elided one frame from package:stack_trace)

The test description was:
  transparent background
════════════════════════════════════════════════════════════════════════════════════════════════════

Test failed. See exception logs above.
The test description was: transparent background