Test::Unit assert_throws

ruby-talk
1

Hi,

Any good examples out there (I couldn't find any) of assert_throws? I
would love to know also why its first argument is a symbol...

Thanks
Mike

2

I'm guessing you might be looking for Exception handling assertions. If so, you want:

assert_raised()
assert_nothing_raised()

assert_throws() is related to catch()/throw(), useful in Ruby for breaking out of nested constructs.

I hope that helps.

James Edward Gray II

···

On Jan 1, 2006, at 11:42 AM, asplake wrote:

Hi,

Any good examples out there (I couldn't find any) of assert_throws? I
would love to know also why its first argument is a symbol...

3

"asplake" <mjb@asplake.co.uk> writes:

Hi,

Any good examples out there (I couldn't find any) of assert_throws? I
would love to know also why its first argument is a symbol...

#assert_throw checks for a Kernel#throw, which takes a Symbol.
Perhaps you were after #assert_raise ?

···

--------------------

require 'test/unit'

def f
  throw :x
end

def g
  raise
end

class T < Test::Unit::TestCase
  def test_a
    assert_throws(:x){f} # pass
    assert_throws(:y){f} # fail
  end
  def test_b
    assert_raise(RuntimeError ){g} # pass
    assert_raise(ArgumentError){g} # fail
  end
end