ruby--ruby/spec/ruby/core/kernel/shared/lambda.rb

describe :kernel_lambda, shared: true do
  it "returns a Proc object" do
    send(@method) { true }.kind_of?(Proc).should == true
  end

  it "raises an ArgumentError when no block is given" do
    suppress_warning do
      -> { send(@method) }.should raise_error(ArgumentError)
    end
  end
end