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require 'spec_helper'
require 'stringio'
describe 'pebble null object' do
class Caller
def call_method(thing)
thing.info
end
def call_method_inside_block(thing)
2.times.each { thing.info }
end
def call_method_inside_nested_block(thing)
2.times.each { 2.times.each { thing.info } }
end
end
subject(:null) { null_class.new }
let(:null_class) do
output = test_output # getting local binding
Naught.build do |b|
b.pebble output
end
end
let(:test_output) { StringIO.new }
it 'prints the name of the method called' do
expect(test_output).to receive(:puts).with(/^info\(\)/)
null.info
end
it 'prints the arguments received' do
expect(test_output).to receive(:puts).with(/^info\(\'foo\', 5, \:sym\)/)
null.info('foo', 5, :sym)
end
it 'prints the name of the caller' do
expect(test_output).to receive(:puts).with(/from call_method$/)
Caller.new.call_method(null)
end
it 'returns self' do
expect(null.info).to be(null)
end
context 'when is called from a block' do
it 'prints the indication of a block',
:pending => jruby? || rubinius? || ruby_18? do
expect(test_output).to receive(:puts).twice.
with(/from block/)
Caller.new.call_method_inside_block(null)
end
it 'prints the name of the method that has the block' do
expect(test_output).to receive(:puts).twice.
with(/call_method_inside_block$/)
Caller.new.call_method_inside_block(null)
end
end
context 'when is called from many levels blocks' do
it 'prints the indication of blocks and its levels',
:pending => jruby? || rubinius? || ruby_18? do
expect(test_output).to receive(:puts).exactly(4).times.
with(/from block \(2 levels\)/)
Caller.new.call_method_inside_nested_block(null)
end
it 'prints the name of the method that has the block' do
expect(test_output).to receive(:puts).exactly(4).times.
with(/call_method_inside_nested_block$/)
Caller.new.call_method_inside_nested_block(null)
end
end
end
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