* @throws Exception if an error occurs
*/
public void testInvokeNoParameters() throws Exception {
try {
GetPolicyValueFunction function =
(GetPolicyValueFunction)createTestableFunction(
ExpressionFactory.getDefaultInstance());
// invoke the function
function.invoke(expressionContext, new Value[0]);
// invoking function with no arguments shold resutl in exception
// being thrown
fail("Invoking getPolicyValue() function with no arguments " +
"should result in an exception being thrown");