Implement this interface in order to create operation classes. An operation is expected to take zero, one or two
parameters (which can be arrays, thus containing multiple values) and return a value (can be an array as well).
Operations MUST be side-effect free, since there is no guarantee that a given operation statement leads to any
specific number of calls to the underlying operation class!
When an operation is to be executed, its class is instantiated using the default constructor, which must be present
and accessible. The resulting instance is used only for a single invocation of the
execute(Object, Object)
method.
The parameter types supported are similar to those supported for
FixtureMethod
parameters, minus enumerations. The same is true for result value types. Integrity will perform autoconversion from
values given in test scripts into the types expected by a given operation class.
Note that an operation must be fine if called with null values, even for expected parameters. This can be the case in
various situations. The operation may of course return null as well in that case, if no other behavior is desired.