85 lines
1.8 KiB
Ruby
85 lines
1.8 KiB
Ruby
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require 'spec_helper'
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describe 'a null object with predicates_return(false)' do
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subject(:null) { null_class.new }
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let(:null_class) do
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Naught.build do |config|
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config.predicates_return false
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end
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end
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it 'responds to predicate-style methods with false' do
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expect(null.too_much_coffee?).to eq(false)
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end
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it 'responds to other methods with nil' do
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expect(null.foobar).to eq(nil)
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end
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describe '(black hole)' do
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let(:null_class) do
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Naught.build do |config|
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config.black_hole
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config.predicates_return false
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end
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end
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it 'responds to predicate-style methods with false' do
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expect(null.too_much_coffee?).to eq(false)
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end
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it 'responds to other methods with self' do
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expect(null.foobar).to be(null)
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end
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end
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describe '(black hole, reverse order config)' do
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let(:null_class) do
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Naught.build do |config|
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config.predicates_return false
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config.black_hole
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end
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end
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it 'responds to predicate-style methods with false' do
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expect(null.too_much_coffee?).to eq(false)
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end
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it 'responds to other methods with self' do
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expect(null.foobar).to be(null)
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end
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end
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class Coffee
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def black?
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true
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end
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def origin
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'Ethiopia'
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end
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end
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describe '(mimic)' do
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let(:null_class) do
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Naught.build do |config|
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config.mimic Coffee
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config.predicates_return false
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end
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end
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it 'responds to predicate-style methods with false' do
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expect(null.black?).to eq(false)
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end
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it 'responds to other methods with nil' do
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expect(null.origin).to be(nil)
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end
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it 'does not respond to undefined methods' do
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expect(null).not_to respond_to(:leaf_variety)
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expect { null.leaf_variety }.to raise_error(NoMethodError)
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end
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end
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end
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