1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
require 'spec_helper'
describe 'singleton null object' do
subject(:null_class) do
Naught.build(&:singleton)
end
it 'does not respond to .new' do
expect { null_class.new }.to raise_error(NoMethodError)
end
it 'has only one instance' do
null1 = null_class.instance
null2 = null_class.instance
expect(null1).to be(null2)
end
it 'can be cloned' do
null = null_class.instance
expect(null.clone).to be(null)
end
it 'can be duplicated' do
null = null_class.instance
expect(null.dup).to be(null)
end
it 'aliases .instance to .get' do
expect(null_class.get).to be null_class.instance
end
it 'permits arbitrary arguments to be passed to .get' do
null_class.get(42, :foo => 'bar')
end
end
|
