code: func (m *MockFileSystem) ReadAll(arg0 io.Reader) ([]byte, error) {
  	ret := m.ctrl.Call(m, "ReadAll", arg0)
  	ret0, _ := ret[0].([]byte)
  	ret1, _ := ret[1].(error)
  	return ret0, ret1
  }
docs: // ReadAll mocks base method