RSpec question about catching expected exception in class .new

Ruby
1

I have the following I’m trying to test:

class Marker
def initialize(secret, guess)
raise ArgumentError, “secret and guess must be the same length”,
caller if guess.length != secret.length
@secret, @guess = secret, guess
end

…

In my spec test, how do I capture that exception? I’m trying to test
that it raises appropriately when secret and guess are different
lengths.

What I’ve tried:

  context "unequal lengths" do
    it 'returns "secret and guess must be the same length"' do
      Marker.new('1234','').should raise_error("secret and guess

must be the same length")
end
end

But it doesn’t actually catch the error, calling it a failed test.
I’ve also tried raise_error(ArgumentError) with the same result. (I’ve
also tried calling Maker::new, but that also has the same result.

2

On 09.11.12 15:01, tamouse mailing lists wrote:

  context "unequal lengths" do
    it 'returns "secret and guess must be the same length"' do
      Marker.new('1234','').should raise_error("secret and guess

must be the same length")
end
end

Try something like this:

context "unequal lengths" do
  it 'returns "secret and guess must be the same length"' do
    expect {
      Marker.new('1234','')
    }.to raise_error("secret and guess must be the same length")
  end
end

That should do the trick.
k

3

On Fri, Nov 9, 2012 at 10:59 AM, Kaspar S. [email protected] wrote:

context "unequal lengths" do

Oh, thanks, yes! I guess I didn’t read far enough in the RSpec book; I
found it!