Скачать или смотреть java unit testing private methods

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unit testing private methods in java can be a contentious topic among developers. the general consensus is that testing private methods directly often indicates that your class might be doing too much or violates the single responsibility principle. instead, it’s usually more beneficial to test the public methods that interact with the private methods. however, there are times when testing private methods directly can be necessary or useful, especially in legacy code or for complex algorithms.

here’s a comprehensive tutorial on how to approach unit testing private methods in java with various strategies.

1. using reflection

java reflection allows you to bypass the access control checks and access private methods. this approach can be useful but should be used sparingly since it can lead to brittle tests.

#### example using reflection



2. testing via public methods

this is the recommended approach. you test the public methods that call the private methods. this way, you ensure that the private methods work correctly as part of the class's overall behavior.

#### example using public methods



3. refactoring for testability

if you find that you need to test private methods often, consider refactoring your code. you might want to extract the private method into a separate class, making it public or protected, which can then be tested directly.

#### example of refactoring



4. using package-private visibility

another approach is to change the access modifier of the private method to package-private (no modifier). this allows you to test the method from a test class in the same package.

#### example using package-private



conclusion

while it is possible to test private methods directly using reflection, it is generally better to focus on testing the public interface of your classes. refactoring code for better testability, using package-private visibility, or extracting complex logic into separate classes can provide cleaner and more m ...

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