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I'm trying to mock sharedPreferences using Mockito in my flutter project. Here is the error log.

package:mockito/src/mock.dart 190:7                                                                       Mock._noSuchMethod
package:mockito/src/mock.dart 184:45                                                                      Mock.noSuchMethod
test\feature\number_trivia\data\datasource\number_trivia_local_datasource_test.mocks.dart 67:14           MockSharedPreferences.setString
package:clean_arch_tdd/features/number_trivia/data/datasources/number_trivia_local_datasource.dart 31:30  NumberTriviaLocalDataSourceImpl.cacheLastNumberTrivia
test\feature\number_trivia\data\datasource\number_trivia_local_datasource_test.dart 51:18                 main.<fn>.<fn>

MissingStubError: 'setString'
No stub was found which matches the arguments of this method call:
setString('CACHED_NUMBER_TRIVIA', '{"text":"Test trivia","number":1}')

Add a stub for this method using Mockito's 'when' API, or generate the mock for MockSharedPreferences with 'returnNullOnMissingStub: true'.

The error refer to this line of code.

local_data_source_test.dart

test('should call sharedPreferences to …

我有一个双精度值，它是我需要将其转换为持续时间的小时数。假设我有一个像这样的函数原型

Duration parseDurationFromDouble(double d) {
    // parse the double
    return parsedDuration;
}

和

2.5由于我的持续时间存储为双精度，那么该函数应该返回，如下所示：

Duration(hours: 2, minutes: 30)

如何在 Dart 中做到这一点？可以直接转换吗？或者我应该通过字符串插值来完成此操作？

提前致谢。