Standard Exception Constructor Tester

ExceptionTester

package com.awilmore.testutils;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import junit.framework.Assert;

public class ExceptionTester extends Assert {

    public ExceptionTester(Class<?> exceptionClass) {
        
        try {
            /* Test default constructor */
            Constructor<?> c1 = exceptionClass.getConstructor();
            Exception e1 = (Exception)c1.newInstance();
            assertNull("Unexpected value for getMessage()", e1.getMessage());
            
            /* Test String constructor */
            String expectedMessage = "Test Message";
            Constructor<?> c2 = exceptionClass.getConstructor(new Class[]{String.class});
            Exception e2 = (Exception)c2.newInstance(new Object[]{expectedMessage});
            assertEquals("Unexpected value for getMessage()", expectedMessage, e2.getMessage());
            
            /* Test Throwable constructor */
            InterruptedException expectedCause = new InterruptedException(expectedMessage);
            Constructor<?> c3 = exceptionClass.getConstructor(new Class[]{Throwable.class});
            Exception e3 = (Exception)c3.newInstance(new Object[]{expectedCause});
            assertEquals("Unexpected value for getCause()", expectedCause, e3.getCause());
            assertEquals("Unexpected value for getMessage()", "java.lang.InterruptedException: " + expectedMessage, e3.getMessage());

            /* Test String, Throwable constructor */
            String expectedMessage2 = "Test Message 2";
            Constructor<?> c4 = exceptionClass.getConstructor(new Class[]{String.class, Throwable.class});
            Exception e4 = (Exception)c4.newInstance(new Object[]{expectedMessage2, expectedCause});
            assertEquals("Unexpected value for getCause()", expectedCause, e4.getCause());
            assertEquals("Unexpected value for getMessage()", expectedMessage2, e4.getMessage());
            
        } catch(SecurityException e) {
            fail("SecurityException thrown when testing exception.");

        } catch(IllegalArgumentException e) {
            fail("IllegalArgumentException thrown when testing exception.");
            
        } catch(NoSuchMethodException e) {
            fail("NoSuchMethodException thrown when testing exception.");
            
        } catch(InstantiationException e) {
            fail("InstantiationException thrown when testing exception.");
            
        } catch(IllegalAccessException e) {
            fail("IllegalAccessException thrown when testing exception.");
            
        } catch(InvocationTargetException e) {
            fail("InvocationTargetException thrown when testing exception.");            
        }
    }
}