ブロックの中身をテストするときのRSpecの書き方 - Qiita

class Sample def foo(x) ho = hoge(x) do |y| piyo(y) end ho + 'foo' end def hoge(x) yield x + 'hoge' end def piyo(y) y + 'piyo' end end describe Sample do it 'yields block of hoge method by passing block to stub' do allow(subject).to receive(:hoge).with('start') do |x, &block| expect(block.call(x)).to eq('startpiyo') 'startpiyo' end subject.foo('start') end it 'yields block of hoge method by using