ExprConstraintDescr fcd = (ExprConstraintDescr) pattern.getDescrs().get( 0 );
assertEquals( "symbol==\"ACME\"",
fcd.getExpression() );
assertNotNull( pattern.getSource() );
EntryPointDescr entry = (EntryPointDescr) pattern.getSource();
assertEquals( "StreamA",
entry.getEntryId() );
}