The old way:

fit.ColumnFixtureBangTester
number 1	number 2	calculate()	sum()	difference()
1	1	true	2	0
1000	-1000	true	0	2000

The new way:

fit.ColumnFixtureBangTester
number 1	number 2	calc!	sum()	difference()
1	1		2	0
1000	-1000		0	2000

Normally, the column below the "bang" cell has nothing in it. However, the cells may use the "error" notation if the action is intended to fail. The next three columns show different options for what to do once a setter method fails as expected.

fit.ColumnFixtureBangTester
this will fail!	you can ignore()	you can check()	you can expect errors()
error		an expected value	error