Verifies MVEL "contains" operator behavior

MvelTest.java

import static org.junit.Assert.*;

import java.util.*;

import org.junit.Test;
import org.mvel2.MVEL;

/**
 * @author Zilvinas Vilutis
 * @since 6.1
 * 
 */
public class MvelTest {

    /**
     * Test method for {@link org.mvel2.MVEL#eval(String, Map)}.
     */
    @Test
    public final void testContainsExpression() {
        final Map<String, String> params = new HashMap<String, String>();
        
        final String expression = "{ 'firstName', 'middleName', 'lastName' } contains updatedFieldName";

        params.put( "updatedFieldName", "firstName" );
        assertTrue( ( Boolean ) MVEL.eval( expression, params ) );
        
        params.put( "updatedFieldName", "middleName" );
        assertTrue( ( Boolean ) MVEL.eval( expression, params ) );
        
        params.put( "updatedFieldName", "lastName" );
        assertTrue( ( Boolean ) MVEL.eval( expression, params ) );
        
        params.put( "updatedFieldName", "address" );
        assertFalse( ( Boolean ) MVEL.eval( expression, params ) );
    }

}