php小编小新在这篇文章中将为您介绍在Go语言中编写单元测试时出现的一种常见错误,即断言错误。当我们在编写单元测试时,有时会遇到无法确定返回值的情况,这会导致意外的方法调用错误。在本文中,我们将讨论这个问题的原因和解决方法,帮助您更好地处理断言错误,确保单元测试的准确性和可靠性。
我在 go 中使用 testify
为我的服务方法编写单元测试,除了更新方法之外,所有方法都工作正常,因为在更新方法中我在更新方法中调用同一服务的另一个方法(“getbyid”) .
在我的服务中实现 update 方法:
func (ts *teamservice) update(team *team.team) apperror { t, err := ts.teamrepo.getbyid(team.id) if err != nil { return err } if t.teamownerid != team.teamownerid { return newforbiddenerror(forbiddenerr) } return ts.teamrepo.update(team) }
mockrepo 更新方法:
func (t *teamrepomock) update(team *team.team) apperror { args := t.called(team) if args.error(0) != nil { return newnotfounderror(args.error(0)) } return nil }
测试的实施:
func testupdate(t *testing.t) { _, teamidgen, playeridgen := setupconfig() t.run("update a team", func(t *testing.t) { teamrepo, _, ts := setupteamservice(teamidgen, playeridgen) teamrepo.on("update", testteam1).return(nil) result := ts.update(testteam1) assert.nil(t, result) }) t.run("update a team fails", func(t *testing.t) { teamrepo, _, ts := setupteamservice(teamidgen, playeridgen) expected := oopserr teamrepo.on("update", testteam1).return(expected) result := ts.update(testteam1) assert.equalvalues(t, expected.error(), result.error()) }) }
现在,当我运行测试时,出现以下错误:
--- FAIL: TestUpdate (0.01s) --- FAIL: TestUpdate/Update_a_team (0.01s) panic: assert: mock: I don't know what to return because the method call was unexpected. Either do Mock.On("GetByID").Return(...) first, or remove the GetByID() call. This method was unexpected: GetByID(string) 0: "" at: [/home/waleem/Desktop/project/eazykhel_server/services/teamservice/team_service_init_test.go:18 /home/waleem/Desktop/project/eazykhel_server/services/teamservice/team_service.go:146 /home/waleem/Desktop/project/eazykhel_server/services/teamservice/team_service_test.go:277] [recovered] panic:
我尝试在测试函数实现中调用 .on("update")
之前和之后调用 mock.on("getbyid")
,但它不起作用,而且我还修改了mockrepo update函数,但它没用。.on("update")
之前和之后调用 mock.on("getbyid")
,但它不起作用,而且我还修改了mockrepo update函数,但它没用。
让我尝试帮助您解决问题。我通过一些简化复制了该存储库,只是为了发布相关代码。如果我在您的解决方案中没有错,有一个服务(teamservice
)调用底层包(teamrepo
)提供的一些方法。您想测试 teamservice
结构的 update
repo/repo.go
让我尝试帮助您解决问题。我通过一些简化复制了该存储库,只是为了发布相关代码。如果我在您的解决方案中没有错,有一个服务(teamservice
)调用底层包(teamrepo
)提供的一些方法。您想测试 teamservice
结构的 update
方法。回顾之后,让我先展示代码,然后我将尝试解释每个文件:getbyid
和 update
package repo type team struct { id int teamownerid int name string } type teamrepo struct{} func (t *teamrepo) getbyid(id int) (team, error) { return team{id: id, teamownerid: id, name: "myteam"}, nil } func (t *teamrepo) update(team team) error { return nil }
services/service.go
。显然,这不是您的实际代码,但现在并不重要。sut
)。通过依赖注入,我们将利用通过接口 teamrepointerface
注入的 repo
package services import ( "errors" "testifymock/repo" ) type teamservice struct { tr teamrepointerface } func newteamservice(repo teamrepointerface) *teamservice { return &teamservice{ tr: repo, } } type teamrepointerface interface { getbyid(id int) (repo.team, error) update(team repo.team) error } func (ts *teamservice) update(team *repo.team) error { t, err := ts.tr.getbyid(team.id) if err != nil { return err } if t.teamownerid != team.teamownerid { return errors.new("forbidden") } return ts.tr.update(*team) }
services/service_test.go
包提供的功能。
package services import ( "errors" "testing" "testifymock/repo" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/mock" ) // 1. declare the mock struct type teamRepoMock struct { mock.Mock } // 2. implement the interface func (m *teamRepoMock) GetByID(id int) (repo.Team, error) { args := m.Called(id) return args.Get(0).(repo.Team), args.Error(1) } func (m *teamRepoMock) Update(team repo.Team) error { args := m.Called(team) return args.Error(0) } func TestUpdate(t *testing.T) { t.Run("GoodUpdate", func(t *testing.T) { // 3. instantiate/setup mock repoMock := new(teamRepoMock) repoMock.On("GetByID", 1).Return(repo.Team{ID: 1, TeamOwnerID: 1, Name: "test"}, nil).Times(1) repoMock.On("Update", repo.Team{ID: 1, TeamOwnerID: 1, Name: "test"}).Return(nil).Times(1) sut := NewTeamService(repoMock) err := sut.Update(&repo.Team{ID: 1, TeamOwnerID: 1, Name: "test"}) // 4. check that all expectations were met on the mock assert.Nil(t, err) assert.True(t, repoMock.AssertExpectations(t)) }) t.Run("BadUpdate", func(t *testing.T) { // 3. instantiate/setup mock repoMock := new(teamRepoMock) repoMock.On("GetByID", 1).Return(repo.Team{ID: 1, TeamOwnerID: 1, Name: "test"}, nil).Times(1) repoMock.On("Update", repo.Team{ID: 1, TeamOwnerID: 1, Name: "test"}).Return(errors.New("some error while updating")).Times(1) sut := NewTeamService(repoMock) err := sut.Update(&repo.Team{ID: 1, TeamOwnerID: 1, Name: "test"}) // 4. check that all expectations were met on the mock assert.Equal(t, "some error while updating", err.Error()) assert.True(t, repoMock.AssertExpectations(t)) }) }
repomock.on("getbyid", 1).return(repo.team{id: 1, teamownerid: 1, 姓名: "test"}, nil).times(1)
在代码中,您可以找到一些注释以更好地详细说明所发生的情况。正如您所猜测的,问题是代码中缺少此调用:
以上是断言:模拟:我不知道要返回什么,因为方法调用是意外的 在 Go 中编写单元测试时出错的详细内容。更多信息请关注PHP中文网其他相关文章!