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Problem

If you have setup guard with your Rails project and you are trying to run it in an (K)Ubuntu installation you get the following message:

Could not open library 'libgtkmm-2.4.so': libgtkmm-2.4.so: cannot open shared object file: No such file or directory.

Solution

Install the missing library with the following:

sudo apt-get install libgtkmm-2.4

Problem
You want to test with RSpec for links that are visible only after the user signs into the application.

Solution
Use the following before method in your RSpec test:

before(:each) do
      @user = Factory(:user)
      sign_in @user
end

Problem
Trying to use the assert_difference with Rails 2.1.0 produces errors if trying to use it with the syntax of another rails version.

Solution
The correct syntax for using assert_difference with rails 2.1.0 is:

def test_should_create_user

assert_difference(User, :count, 1) do

user = create_user

assert !user.new_record?, "#{user.errors.full_messages.to_sentence}"

end

end