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require File.expand_path('../../../spec_helper', __FILE__)
require 'prime'
describe "Prime.instance" do
it "returns a object representing the set of prime numbers" do
Prime.instance.should be_kind_of(Prime)
end
it "returns a object with no obsolete features" do
Prime.instance.should_not respond_to(:succ)
Prime.instance.should_not respond_to(:next)
end
it "does not complain anything" do
lambda { Prime.instance }.should_not complain
end
it "raises a ArgumentError when is called with some arguments" do
lambda { Prime.instance(1) }.should raise_error(ArgumentError)
end
end
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