How Can I Mock a Final Class in Mockito?

Mocking Final Classes with Mockito

Problem:

You have a final class that you want to mock in a JUnit test. However, Mockito appears to have limitations in mocking final classes.

Detailed Question:

Consider the following example code:

Java

public final class RainOnTrees {
   public void startRain() {
      // some code here
   }
}

In another class:

Java

public class Seasons {
   RainOnTrees rain = new RainOnTrees();
   public void findSeasonAndRain() {
      rain.startRain();
   }
}

In the JUnit test class for Seasons.java, you want to mock the RainOnTrees class. How can you achieve this using Mockito?

Answer:

Beginning with Mockito v2, it has become possible to mock final classes. To enable this functionality, add the following to your Gradle file:

Java

testImplementation 'org.mockito:mockito-inline:2.13.0'

Note that mocking final classes was not feasible with Mockito v1. As mentioned in the Mockito FAQ:

"Cannot mock final classes"

For more information on the limitations of Mockito, refer to the official documentation.

The above is the detailed content of How Can I Mock a Final Class in Mockito?. For more information, please follow other related articles on the PHP Chinese website!