code: func (_m *MockProvider) Sign(_a0 *x509.CertificateRequest) (string, error) {
  	ret := _m.Called(_a0)
  
  	var r0 string
  	if rf, ok := ret.Get(0).(func(*x509.CertificateRequest) string); ok {
  		r0 = rf(_a0)
  	} else {
  		r0 = ret.Get(0).(string)
  	}
  
  	var r1 error
  	if rf, ok := ret.Get(1).(func(*x509.CertificateRequest) error); ok {
  		r1 = rf(_a0)
  	} else {
  		r1 = ret.Error(1)
  	}
  
  	return r0, r1
  }
docs: // Sign provides a mock function with given fields: _a0