log exception

Item.java

package com.company;

import java.util.logging.Level;
import java.util.logging.Logger;

public class Item {

    Logger log = Logger.getLogger("ItemLogger");

    public boolean function(String param) {
        if (param==null) {
            log.log(Level.SEVERE,"error", new IllegalArgumentException("boom"));
            return false;
        }
        return true;
    }
}

ItemTest.java

package com.company;

import org.junit.Test;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

public class ItemTest {

    @Test
    public void testFunction()  {
        assertThat(new Item().function(null),is(false));
    }
}