package org.junit.validator;
   
   import static org.hamcrest.CoreMatchers.equalTo;
   import static org.hamcrest.CoreMatchers.is;
   import static org.hamcrest.MatcherAssert.assertThat;
   
   import java.util.Collections;
   import java.util.List;
   
  import org.junit.Test;
  import org.junit.runners.model.TestClass;
  
  public class PublicClassValidatorTest {
      private final PublicClassValidator validator = new PublicClassValidator();
  
      public static class PublicClass {
  
      }
  
      @Test
      public void acceptsPublicClass() {
          TestClass testClass = new TestClass(PublicClass.class);
          List<Exception> validationErrors = validator
                  .validateTestClass(testClass);
          assertThat(validationErrors,
                  is(equalTo(Collections.<Exception> emptyList())));
      }
  
      static class NonPublicClass {
  
      }
  
      @Test
      public void rejectsNonPublicClass() {
          TestClass testClass = new TestClass(NonPublicClass.class);
          List<Exception> validationErrors = validator
                  .validateTestClass(testClass);
          assertThat("Wrong number of errors.", validationErrors.size(),
                  is(equalTo(1)));
      }
  }