[rspec-users] Can some one please explain why one of those two examples fails?

Mohamad El-Husseini husseini.mel at gmail.com
Tue Mar 13 23:55:35 UTC 2012


The following are what I believe two ways of doing the same thing. Only the 
first example fails, while the latter passes. I'm finding it hard to get to 
understand describe and context blocks, particularly with respect to 
scopes. I would appreciate any "for dummies" explanation, or a link to a 
blog post that can clear this up for me. I'm still new to Rails and Ruby.

  describe "send password reset" do
    let(:user) { FactoryGirl.create(:user) }

    # This fails
    context "generates a unique password_reset_token each time" do
      let(:user) { FactoryGirl.create(:user) }
      before do
        user.send_password_reset
        last_token = user.password_reset_token
        user.send_password_reset
      end
      its(:password_reset_token) { should_not == last_token }
    end

    # This passes
    it "generates a unique password_reset_token each time" do
      user.send_password_reset
      last_token = user.password_reset_token
      user.send_password_reset
      user.password_reset_token.should_not == last_token
    end
  end

The first example fails with this:

Failure/Error: its(:password_reset_token) { should_not == last_token }
     NameError:
       undefined local variable or method `last_token' for 
#<RSpec::Core::ExampleGroup::Nested_6::Nested_7::Nested_1::Nested_1:0x0000000561e130>

Earlier, it out puts this:

 should not When you call a matcher in an example without a String, like 
this:

specify { object.should matcher }

or this:

it { should matcher }

RSpec expects the matcher to have a #description method. You should either
add a String to the example this matcher is being used in, or give it a
description method. Then you won't have to suffer this lengthy warning 
again.
 (FAILED - 1)


Another thing I noticed is that I can not use capybara inside of describe 
blocks unless the calls are in a before block... but I don't understand why.
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