add function domains to test_evaluable.check
add function domains to test_evaluable.check

This patch changes the randomly generated function arguments in
test_evaluable.check by deterministic values that are constructed to contain
elements of all relevant number classes, e.g., zero, positives, negatives, or
integers. Conversely, the generated arrays can be used as a signal that the
method accepts values from the included classes, such as the zero value.

wijnandhoitinga/nutils