How far do you take code coverage?

//this class is meant as a pseudo-enum - I'm stuck on Java 1.4 for time being
public final class BillingUnit {

    public final static BillingUnit MONTH = new BillingUnit("month");
    public final static BillingUnit YEAR = new BillingUnit("year");

    private String value;

    private BillingUnit(String value) {
    	this.value = value;
    }

    public String getValue() {
    	return this.value;
    }

    public boolean equals(Object obj) {
    	return value.equals(((BillingUnit) obj).getValue());

    }

    public int hashCode() {
    	return value.hashCode();
    }
}

if(logger.isDebugEnabled()) {
    logger.debug("something");
}

public float reciprocal (float ex)
{
    return (1.0 / ex) ;
}