rspec

be_all_spec.rb

describe  Fixnum do
  subject { [1,2,3,4] }
  specify { subject.all?{|v| v==1} }
  it { should_not be_all{|v| v==1 }}
  it { should be_any{|v| v==1 } }

  it { should be_any(&lambda{|v| v==1 }) }
end

class Foo
  def active?
    true
  end
end

class Bar
  def active?
    false
  end
end

describe Foo do
  subject { [Foo.new,Bar.new] }
  it { should be_any(&:active?) }
  it { should_not be_all(&:active?) }
end