public abstract String[] getPolicyNames();
public void testConvertLengthFromMMWithInvalidUnit() {
DILengthFunction function = getFunction();
try {
function.convertLengthFromMm(10, "mmm");
fail("Attempting to convert a length when the specified unit is " +
"invalid should cause an exception to be thrown");
} catch(IllegalArgumentException e) {
// do nothing, correct behaviour
}