View unit test from jbpm code

In jbpm, we can see such tests in many places. Code :
Pd = new processdefinition (New String [] {
"Start-state start ",
"State first ",
"State Second ",
"State third ",
"End-state end"
}, New string [] {
"Start -- left --> first ",
"Start -- right --> second ",
"First --> third ",
"Second --> third ",
"Third --> end"
});
The first parameter of this method is the node array in the process definition, and the second parameter is the expression of transition.
For example, second --> third indicates a transition from second node to third node.
Start -- left --> first indicates a transition from start to first. Its name is left.
The code for parsing this string is in the processfactory. cuttransitiontext () method, and this method is completely for testing
From this we can see the importance of unit testing.