Exceptions and Flow Control

Scampi can assert on exceptions, throws, and state changes.

Raising Exceptions

Wrap the code in a lambda and call .should.raise:

lambda { raise "boom" }.should.raise
lambda { raise "boom" }.should.raise(RuntimeError)
lambda { 1 + 1 }.should.not.raise

Test that a symbol is thrown:

lambda { throw :halt }.should.throw(:halt)

Assert that a block changes the result of an expression:

i = 0
lambda { i += 1 }.should.change { i }