foo_spec.rb

class Foo
end

describe Foo do
  it "should call the right equals method" do
    Foo.new.should be_equal Foo.new
  end
end

results

$ spec test_spec.rb 
F

1)
'Foo should call the right equals method' FAILED
expected equal?(#<Foo:0x00000001f3c568>) to return true, got false
test_spec.rb:6:in `block (2 levels) in <top (required)>'
/home/vagrant/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
/home/vagrant/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'

Finished in 0.017849162 seconds

1 example, 1 failure