Extracted programming examples into their own test fixture. Extract method allow entry of multiple numbers and made programming easier in the test.
Changed method to two for a more fluent interface. Moving towards returning a function that can program the calculator.
Extracted related tests into their own fixture. Moved test utility methods into class and the static import them to remove duplication.
Extracted programming to its own class. Might migrate this to a production class at some point.
Repackaging and replace some blocks with lambda expressions as recommended by IDE.
Repackaged some classes. Added some new functions that were part of the programming story. Took a wrong turn, but these are still OK.