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require 'helper'
describe Twitter::NullObject do
describe '#!' do
it 'returns true' do
expect(!subject).to be true
end
end
describe '#respond_to?' do
it 'returns true for any method' do
expect(subject).to respond_to(:missing?)
end
end
describe '#respond_to?' do
it 'returns true for any method' do
expect(subject).to respond_to(:missing?)
end
end
describe '#instance_of?' do
it 'returns true for Twitter::NullObject' do
expect(subject).to be_instance_of(Twitter::NullObject)
end
it 'returns false for other classes' do
expect(subject).not_to be_instance_of(String)
end
end
describe '#kind_of?' do
it 'returns true for Twitter::NullObject' do
expect(subject).to be_a Twitter::NullObject
end
it 'returns true for module ancestors' do
expect(subject).to be_a Comparable
end
it 'returns true for class ancestors' do
expect(subject).to be_a Naught::BasicObject
end
it 'returns false for non-ancestors' do
expect(subject).not_to be_a String
end
end
describe '#<=>' do
it 'sorts before non-null objects' do
expect(subject <=> 1).to eq(-1)
end
it 'is equal to other Twitter::NullObjects' do
null_object1 = Twitter::NullObject.new
null_object2 = Twitter::NullObject.new
expect(null_object1 <=> null_object2).to eq(0)
end
end
describe '#nil?' do
it 'returns true' do
expect(subject.nil?).to be true
end
end
describe '#as_json' do
it "returns 'null'" do
expect(subject.as_json).to eq('null')
end
end
describe '#to_json' do
it 'returns JSON' do
expect({'null_object' => subject}.to_json).to eq('{"null_object":null}')
end
end
describe 'black hole' do
it 'returns self for missing methods' do
expect(subject.missing).to eq(subject)
end
end
describe 'explicit conversions' do
describe '#to_a' do
it 'returns an empty array' do
expect(subject.to_a).to be_empty
end
end
describe '#to_s' do
it 'returns an empty string' do
expect(subject.to_s).to be_empty
end
end
end
describe 'implicit conversions' do
describe '#to_ary' do
it 'returns an empty array' do
expect(subject.to_ary).to be_empty
end
end
describe '#to_str' do
it 'returns an empty string' do
expect(subject.to_str).to be_empty
end
end
end
describe 'predicates' do
it 'return false for missing methods' do
expect(subject).not_to be_missing
end
end
describe '#presence' do
it 'returns nil' do
expect(subject.presence).to eq nil
end
end
describe '#blank?' do
it 'returns true' do
expect(subject.blank?).to eq true
end
end
describe '#present?' do
it 'returns false' do
expect(subject.present?).to eq false
end
end
end
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