PowerMock - Supress Behavior

PowerMock allows to suppress unwanted behavior like call to unwanted constructor, static method, static block or even fields. For example, suppress method of PowerMockito can be used to suppress call to a constructor using following syntax.

PowerMockito.suppress(PowerMockito.constructor(BasePortfolio.class));

Example

Below is the complete example of supressing behavior.

File: BasePortfolio.java

package com.tutorialspoint;

public class BasePortfolio {
   private boolean servicesConfigured = false;
   public BasePortfolio(){
      //configure services
      servicesConfigured = true;
   }

   public boolean isServicesConfigured(){
      return servicesConfigured;
   }
}

File: Portfolio.java

package com.tutorialspoint;

public class Portfolio extends BasePortfolio {
   public Portfolio(){
      super();
   }
}

Let's test the Portfolio class.

File: PortfolioTester.java

package com.tutorialspoint;
import static org.junit.Assert.assertEquals;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith( PowerMockRunner.class ) 
@PrepareForTest(  Portfolio.class  ) 
public class PortfolioTester {
   Portfolio portfolio;	

   @Test
   public void testServicesNotConfigured(){
      PowerMockito.suppress(PowerMockito.constructor(BasePortfolio.class));
      portfolio = new Portfolio();
      assertEquals ( "Base constructor not called, services not configured", 
         false,  portfolio.isServicesConfigured()); 
   }

   @Test
   public void testServicesConfigured(){
      portfolio = new Portfolio();
      assertEquals ( "Base constructor called, services configured", 
         true,  portfolio.isServicesConfigured()); 
   }
}

Output

Once you are done with creating the source files, you are ready for this step, which is compiling and running your program. To do this, keep PortfolioTester.Java file tab active, right click within the content area of PortfolioTester.Java and click on Run As > Junit Test option. If everything is fine with your application, this will run the test case in Eclipse JUnit Window and you can see the test case result as green means it is passed otherwise red being failed.