Rspec | should_receive は何をしている？ ref: http://qiita.com/Yinaura/items/d18658a2aff39bfb0243

file0.txt

it do
  SomeModel.should_receive(:create)
  SomeModel.create
end

file1.txt

it do
  SomeModel.create
  SomeModel.should_receive(:create)
end

file2.txt

it do
  SomeModel.should_receive(:create).with)(title: 'Bible')
  SomeModel.create(title: 'Bible')
end

file3.txt

it do
  SomeModel.should_receive(:create).with)(title: 'Bible')
  SomeModel.create(title: 'Gone with the wind')
end