SingletonEnforcerTest.java

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package org.glassfish.admin.amx.test;

import org.glassfish.admin.amx.impl.util.SingletonEnforcer;
import static org.junit.Assert.assertTrue;

import org.junit.Test;


public final class SingletonEnforcerTest extends TestBase
{
    public SingletonEnforcerTest() {
    }

    private static final class Dummy {}
    
    @Test
    public void testForNull() {
        assertTrue( SingletonEnforcer.get( Dummy.class ) == null );
    }

    @Test
    public void testVariety() {
        SingletonEnforcer.register( String.class, "hello" );
        assertNotNull( SingletonEnforcer.get( String.class ) );
        
        SingletonEnforcer.register( Boolean.class, Boolean.TRUE );
        assertNotNull( SingletonEnforcer.get( Boolean.class ) );
        
        SingletonEnforcer.register( Integer.class, new Integer(0) );
        assertNotNull( SingletonEnforcer.get( Integer.class ) );
    }
    
    /*
    @Test(expected=IllegalArgumentException.class)
    public void testForBrokenJUnit() {
        throw new IllegalArgumentException( "expected" );
    }
    */


    private static final class Dummy2 {}
    @Test
    public void testForDuplicates() {
        final String s = "";
        SingletonEnforcer.register( Dummy2.class, this );
        try {
            SingletonEnforcer.register( Dummy2.class, this );
        }
        catch( IllegalArgumentException e) { /*OK*/ }
    }
}