@Override
			public boolean evaluateContextBefore(VarnodeContext context, Instruction instr) {

				// TODO Auto-generated method stub
				return super.evaluateContextBefore(context, instr);
			}
quick and dirty test of the ProgramContextImpl just to see
if the values are being set for specified address range.
The ProgramContextPlugin will be a more complete test
program, with a gui interface to specify the values and
select/highlight an address range.
Ghidra/Features/Base/src/test/java/ghidra/program/util/ConstantPropogationReferenceTest.java