changeTest is an operator for test values.
changeTest(test, phase, assessment_structure)a string containing the current test in the format T?, where ? is a number.
a string containing the current phase in the format P?, where ? is a number.
an assessment_structure object.
a string containing the new test.
## assessment uses two phases
changeTest("T1", "P1", assessment_structure_math) ## T1
changeTest("T1", "P2", assessment_structure_math) ## T2