Node Machine Unit Tests

[Timmoth]

Foreach Probability Chooser:
Determine that altering each Item's Weight results in the correct distribution over a large number of calls to GetChoice.

• All exceptions are raised as expected.
• Total Weight

DeterministicChooser
That it returns the correct Choice given to the constructor.
That it returns the correct choice when updated through the Choice property.

Foreach Node:
OnVisited Fired
OnExited Fired
Moves to an expected node for a given Chooser
GetNextNodes returns expected nodes
ToString returns expected representation
Can update Chooser function