Test::Unit assert_throws


#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

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…

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 G. II


#3

“asplake” removed_email_address@domain.invalid 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