[英]How to Unit Test code that is dependent on 3rd-Party-Package in Flutter?
如何测试 flutter 中的代码,这取决于 path_provider 插件?
对依赖于 path_provider 插件的代码执行测试时,出现以下错误:
MissingPluginException(No implementation found for method getStorageDirectory on channel plugins.flutter.io/path_provider)
package:flutter/src/services/platform_channel.dart 319:7 MethodChannel.invokeMethod
===== asynchronous gap ===========================
dart:async _asyncErrorWrapperHelper
package: mypackage someClass.save
unit_tests/converter_test.dart 19:22
main.<fn>
您需要模拟被测试代码调用的所有方法(如果它调用它们并取决于它们的结果)
在您的情况下,您应该模拟方法getStorageDirectory()
以使其返回一些满足您的测试的结果
如何模拟的一个简短示例:
class MyRepo{
int myMethod(){
return 0;
}
}
class MockRepo extends Mock implements MyRepo{}
void main(){
MockRepo mockRepo = MockRepo();
test('should test some behaviour',
() async {
// arrange
when(mockRepo.myMethod()).thenAnswer(1);//in the test when myMethod is called it will return 1 and not 0
// act
//here put some method that will invoke myMethod on the MockRepo and not on the real repo
// assert
verify(mockRepo.myMethod());//verify that myMethod was called
},
);
}
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