diff --git a/cmd/diff.go b/cmd/diff.go
index 94433bf..6ad26c9 100644
--- a/cmd/diff.go
+++ b/cmd/diff.go
@@ -180,7 +180,7 @@ func doDiffUnderProw(cmd *cobra.Command, args []string) {
 		}
 		qc = qiniu.NewClient(&conf)
 
-		localArtifacts := qiniu.Artifacts{
+		localArtifacts := qiniu.ProfileArtifacts{
 			Directory:          artifacts,
 			ProfileName:        newProfile,
 			ChangedProfileName: qiniu.ChangedProfileName,
diff --git a/pkg/github/github_test.go b/pkg/github/github_test.go
index 21115d7..6b4aa57 100644
--- a/pkg/github/github_test.go
+++ b/pkg/github/github_test.go
@@ -135,6 +135,12 @@ func TestCreateGithubComment(t *testing.T) {
 	p.CreateGithubComment("", coverList)
 }
 
+func TestCreateGithubCommentError(t *testing.T) {
+	p := &GithubPrComment{}
+	err := p.CreateGithubComment("", cover.DeltaCovList{})
+	assert.NoError(t, err)
+}
+
 func TestGetPrChangedFiles(t *testing.T) {
 	client, router, _, teardown := setup()
 	defer teardown()
@@ -160,3 +166,11 @@ func TestGetPrChangedFiles(t *testing.T) {
 	assert.Equal(t, err, nil)
 	assert.Equal(t, changedFiles, expectFiles)
 }
+
+func TestGetCommentFlag(t *testing.T) {
+	p := GithubPrComment{
+		CommentFlag: "flag",
+	}
+	flag := p.GetCommentFlag()
+	assert.Equal(t, flag, p.CommentFlag)
+}
diff --git a/pkg/mock/clients/github.go b/pkg/mock/clients/github.go
index 2eab5bf..2b77786 100644
--- a/pkg/mock/clients/github.go
+++ b/pkg/mock/clients/github.go
@@ -1,24 +1,34 @@
 package clients
 
-import "github.com/qiniu/goc/pkg/cover"
+import (
+	"github.com/qiniu/goc/pkg/cover"
+)
 
 type MockPrComment struct {
+	GetPrChangedFilesRes   []string
+	GetPrChangedFilesErr   error
+	PostCommentErr         error
+	EraseHistoryCommentErr error
+	CreateGithubCommentErr error
+	CommentFlag            string
 }
 
 func (s *MockPrComment) GetPrChangedFiles() (files []string, err error) {
-	return nil, nil
+	return s.GetPrChangedFilesRes, s.GetPrChangedFilesErr
 }
+
 func (s *MockPrComment) PostComment(content, commentPrefix string) error {
-	return nil
+	return s.PostCommentErr
 }
+
 func (s *MockPrComment) EraseHistoryComment(commentPrefix string) error {
-	return nil
+	return s.EraseHistoryCommentErr
 }
 
 func (s *MockPrComment) CreateGithubComment(commentPrefix string, diffCovList cover.DeltaCovList) (err error) {
-	return nil
+	return s.CreateGithubCommentErr
 }
 
 func (s *MockPrComment) GetCommentFlag() string {
-	return ""
+	return s.CommentFlag
 }
diff --git a/pkg/mock/clients/qiniu.go b/pkg/mock/clients/qiniu.go
index 94ca5e8..dcdda29 100644
--- a/pkg/mock/clients/qiniu.go
+++ b/pkg/mock/clients/qiniu.go
@@ -3,32 +3,59 @@ package clients
 import (
 	"context"
 	"github.com/qiniu/goc/pkg/qiniu"
+	"os"
 	"time"
 )
 
 type MockQnClient struct {
+	QiniuObjectHandleRes  qiniu.ObjectHandle
+	ReadObjectRes         []byte
+	ReadObjectErr         error
+	ListAllRes            []string
+	ListAllErr            error
+	GetAccessURLRes       string
+	GetArtifactDetailsRes *qiniu.LogHistoryTemplate
+	GetArtifactDetailsErr error
+	ListSubDirsRes        []string
+	ListSubDirsErr        error
 }
 
 func (s *MockQnClient) QiniuObjectHandle(key string) qiniu.ObjectHandle {
-	return nil
+	return s.QiniuObjectHandleRes
 }
 
 func (s *MockQnClient) ReadObject(key string) ([]byte, error) {
-	return nil, nil
+	return s.ReadObjectRes, s.ReadObjectErr
 }
 
 func (s *MockQnClient) ListAll(ctx context.Context, prefix string, delimiter string) ([]string, error) {
-	return nil, nil
+	return s.ListAllRes, s.ListAllErr
 }
 
 func (s *MockQnClient) GetAccessURL(key string, timeout time.Duration) string {
-	return ""
+	return s.GetAccessURLRes
 }
 
 func (s *MockQnClient) GetArtifactDetails(key string) (*qiniu.LogHistoryTemplate, error) {
-	return nil, nil
+	return s.GetArtifactDetailsRes, s.GetArtifactDetailsErr
 }
 
 func (s *MockQnClient) ListSubDirs(prefix string) ([]string, error) {
-	return nil, nil
+	return s.ListSubDirsRes, s.ListSubDirsErr
+}
+
+type MockArtifacts struct {
+	ProfilePathRes           string
+	CreateChangedProfileRes  *os.File
+	GetChangedProfileNameRes string
+}
+
+func (s *MockArtifacts) ProfilePath() string {
+	return s.ProfilePathRes
+}
+func (s *MockArtifacts) CreateChangedProfile() *os.File {
+	return s.CreateChangedProfileRes
+}
+func (s *MockArtifacts) GetChangedProfileName() string {
+	return s.GetChangedProfileNameRes
 }
diff --git a/pkg/prow/job.go b/pkg/prow/job.go
index eb26984..e1d3f69 100644
--- a/pkg/prow/job.go
+++ b/pkg/prow/job.go
@@ -55,7 +55,7 @@ type Job struct {
 	CovThreshold           int
 	LocalProfilePath       string
 	QiniuClient            qiniu.Client
-	LocalArtifacts         *qiniu.Artifacts
+	LocalArtifacts         qiniu.Artifacts
 	GithubComment          github.PrComment
 	FullDiff               bool
 }
@@ -70,16 +70,13 @@ func (j *Job) RunPresubmit() error {
 	// step1: get local profile cov
 	localP, err := cover.ReadFileToCoverList(j.LocalProfilePath)
 	if err != nil {
-		logrus.Errorf("failed to get remote cover profile: %s", err.Error())
-		return err
+		return fmt.Errorf("failed to get remote cover profile: %s", err.Error())
 	}
-	logrus.Warnf("localP: [%+v]", localP)
 
 	//step2: find the remote healthy cover profile from qiniu bucket
 	remoteProfile, err := qiniu.FindBaseProfileFromQiniu(j.QiniuClient, j.PostSubmitJob, j.PostSubmitCoverProfile)
 	if err != nil {
-		logrus.Errorf("failed to get remote cover profile: %s", err.Error())
-		return err
+		return fmt.Errorf("failed to get remote cover profile: %s", err.Error())
 	}
 	if remoteProfile == nil {
 		logrus.Infof("get non healthy remoteProfile, do nothing")
@@ -87,31 +84,27 @@ func (j *Job) RunPresubmit() error {
 	}
 	baseP, err := cover.CovList(bytes.NewReader(remoteProfile))
 	if err != nil {
-		logrus.Errorf("failed to get remote cover profile: %s", err.Error())
-		return err
+		return fmt.Errorf("failed to get remote cover profile: %s", err.Error())
 	}
 
-	logrus.Warnf("baseP: [%+v]", baseP)
-
 	// step3: get github pull request changed files' name and calculate diff cov between local and remote profile
 	changedFiles, deltaCovList, err := getFilesAndCovList(j.FullDiff, j.GithubComment, localP, baseP)
 	if err != nil {
-		logrus.Errorf("Get files and covlist failed: %s", err.Error())
-		return err
+		return fmt.Errorf("Get files and covlist failed: %s", err.Error())
 	}
 
 	// step4: generate changed file html coverage
 	err = j.WriteChangedCov(changedFiles)
 	if err != nil {
-		logrus.WithError(err).Fatalf("filter local profile to %s with changed files failed", j.LocalArtifacts.ChangedProfileName)
+		return fmt.Errorf("filter local profile to %s with changed files failed: %s", j.LocalArtifacts.GetChangedProfileName(), err.Error())
 	}
 	err = j.CreateChangedCovHtml()
 	if err != nil {
-		logrus.WithError(err).Fatalf("create changed file related coverage html failed")
+		return fmt.Errorf("create changed file related coverage html failed: %s", err.Error())
 	}
 	j.SetDeltaCovLinks(deltaCovList)
 
-	// step6: post comment to github
+	// step5: post comment to github
 	commentPrefix := github.CommentsPrefix
 	if j.GithubComment.GetCommentFlag() != "" {
 		commentPrefix = fmt.Sprintf("**%s** ", j.GithubComment.GetCommentFlag()) + commentPrefix
@@ -122,7 +115,7 @@ func (j *Job) RunPresubmit() error {
 	}
 	err = j.GithubComment.CreateGithubComment(commentPrefix, deltaCovList)
 	if err != nil {
-		logrus.WithError(err).Fatalf("Post comment to github failed.")
+		return fmt.Errorf("Post comment to github failed: %s", err.Error())
 	}
 
 	return nil
@@ -202,10 +195,10 @@ func (j *Job) SetDeltaCovLinks(c cover.DeltaCovList) {
 
 // CreateChangedCovHtml create changed file related coverage html base on the local artifact
 func (j *Job) CreateChangedCovHtml() error {
-	if j.LocalArtifacts.ChangedProfileName == "" {
+	if j.LocalArtifacts.GetChangedProfileName() == "" {
 		logrus.Errorf("param LocalArtifacts.ChangedProfileName is empty")
 	}
-	pathProfileCov := j.LocalArtifacts.ChangedProfileName
+	pathProfileCov := j.LocalArtifacts.GetChangedProfileName()
 	pathHtmlCov := path.Join(os.Getenv("ARTIFACTS"), j.HtmlProfile())
 	cmdTxt := fmt.Sprintf("go tool cover -html=%s -o %s", pathProfileCov, pathHtmlCov)
 	logrus.Printf("Running command '%s'\n", cmdTxt)
diff --git a/pkg/prow/job_test.go b/pkg/prow/job_test.go
index 541ea7b..633d6ce 100644
--- a/pkg/prow/job_test.go
+++ b/pkg/prow/job_test.go
@@ -18,6 +18,8 @@ package prow
 
 import (
 	"errors"
+	"fmt"
+	"github.com/qiniu/goc/pkg/cover"
 	"github.com/qiniu/goc/pkg/github"
 	"github.com/qiniu/goc/pkg/mock/clients"
 	"github.com/qiniu/goc/pkg/qiniu"
@@ -35,7 +37,8 @@ qiniu.com/kodo/bd/bdgetter/source.go:19.118,22.2 2 0
 qiniu.com/kodo/bd/bdgetter/source.go:37.34,39.2 1 0
 qiniu.com/kodo/bd/pfd/locker/app/qboxbdlocker/main.go:50.2,53.52 4 1
 qiniu.com/kodo/bd/pfd/locker/bdlocker/locker.go:33.51,35.2 1 0`
-	defaultLocalPath = "local.cov"
+	defaultLocalPath   = "local.cov"
+	defaultChangedPath = "changed.cov"
 )
 
 func TestTrimGhFileToProfile(t *testing.T) {
@@ -76,7 +79,7 @@ qiniu.com/kodo/bd/pfd/locker/bdlocker/locker.go:33.51,35.2 1 0
 	defer os.Remove(savePath)
 	j := &Job{
 		LocalProfilePath: path,
-		LocalArtifacts:   &qiniu.Artifacts{ChangedProfileName: savePath},
+		LocalArtifacts:   &qiniu.ProfileArtifacts{ChangedProfileName: savePath},
 	}
 	j.WriteChangedCov(changedFiles)
 
@@ -133,7 +136,7 @@ func TestRunPresubmitFulldiff(t *testing.T) {
 		PostSubmitJob:          "kodo-postsubmits-go-st-coverage",
 		PostSubmitCoverProfile: "filterd.cov",
 		LocalProfilePath:       localPath,
-		LocalArtifacts:         &qiniu.Artifacts{ChangedProfileName: ChangedProfilePath},
+		LocalArtifacts:         &qiniu.ProfileArtifacts{ChangedProfileName: ChangedProfilePath},
 		QiniuClient:            qc,
 		GithubComment:          prClient,
 		FullDiff:               true,
@@ -144,44 +147,60 @@ func TestRunPresubmitFulldiff(t *testing.T) {
 	assert.NoError(t, err)
 }
 
-func TestRunPresubmitErrorGetRemoteCoverProfile(t *testing.T) {
-	j := &Job{
-		LocalProfilePath: "unkown",
+func TestRunPresubmitError(t *testing.T) {
+	items := []struct {
+		prepare bool // 是否需要准备本地cov
+		j       Job
+		err     string
+	}{
+		{
+			prepare: false,
+			j: Job{
+				LocalProfilePath: "unkown",
+			},
+			err: "no such file or directory",
+		},
+		{
+			prepare: true,
+			j: Job{
+				LocalProfilePath: defaultLocalPath,
+				QiniuClient:      &clients.MockQnClient{},
+			},
+		},
+		{
+			prepare: true,
+			j: Job{
+				LocalProfilePath: defaultLocalPath,
+				QiniuClient:      &clients.MockQnClient{ListSubDirsErr: errors.New("mock error")},
+			},
+			err: "mock error",
+		},
+		{
+			prepare: true,
+			j: Job{
+				LocalProfilePath: defaultLocalPath,
+				QiniuClient:      &MockProfileQnClient{},
+				GithubComment:    &clients.MockPrComment{GetPrChangedFilesRes: []string{"qiniu.com/kodo/apiserver/server/main.go"}},
+				FullDiff:         true,
+				LocalArtifacts:   &qiniu.ProfileArtifacts{ChangedProfileName: defaultChangedPath},
+			},
+			err: "",
+		},
 	}
-	err := j.RunPresubmit()
-	assert.Contains(t, err.Error(), "no such file or directory")
-}
-
-func TestRunPresubmitGetEmptyProfile(t *testing.T) {
-	path := "local.cov"
-	setup(path, defaultContent)
-	defer os.Remove(path)
-	j := &Job{
-		LocalProfilePath: path,
-		QiniuClient:      &clients.MockQnClient{},
+	for _, tc := range items {
+		if tc.prepare {
+			path := defaultLocalPath
+			setup(path, defaultContent)
+			defer os.Remove(path)
+			defer os.Remove(defaultChangedPath)
+		}
+		err := tc.j.RunPresubmit()
+		if tc.err == "" {
+			assert.NoError(t, err)
+		} else {
+			assert.Contains(t, err.Error(), tc.err)
+		}
 	}
-	err := j.RunPresubmit()
-	assert.NoError(t, err)
-}
-
-type MockErrorListSubDirsQnClient struct {
-	*clients.MockQnClient
-}
-
-func (s *MockErrorListSubDirsQnClient) ListSubDirs(prefix string) ([]string, error) {
-	return nil, errors.New("mock error")
-}
-
-func TestRunPresubmitErrorGetBaseProfile(t *testing.T) {
-	path := "local.cov"
-	setup(path, defaultContent)
-	defer os.Remove(path)
-	j := &Job{
-		LocalProfilePath: path,
-		QiniuClient:      &MockErrorListSubDirsQnClient{},
-	}
-	err := j.RunPresubmit()
-	assert.Contains(t, err.Error(), "mock error")
 }
 
 type MockProfileQnClient struct {
@@ -189,7 +208,7 @@ type MockProfileQnClient struct {
 }
 
 func (s *MockProfileQnClient) ListSubDirs(prefix string) ([]string, error) {
-	return []string{"1"}, nil
+	return []string{defaultContent}, nil
 }
 
 func (s *MockProfileQnClient) ReadObject(key string) ([]byte, error) {
@@ -200,43 +219,93 @@ func (s *MockProfileQnClient) ReadObject(key string) ([]byte, error) {
 	return []byte(""), nil
 }
 
-// 无法实现coverList报错
-//func TestRunPresubmitErrorReadBaseProfile(t *testing.T) {
-//	path := "local.cov"
-//	setup(path, defaultContent)
-//	defer os.Remove(path)
-//	j := &Job{
-//		LocalProfilePath: path,
-//		QiniuClient:      &MockProfileQnClient{},
-//	}
-//	err := j.RunPresubmit()
-//	assert.Contains(t, err.Error(), "mock error")
-//}
+func TestGetFilesAndCovList(t *testing.T) {
+	items := []struct {
+		fullDiff   bool
+		prComment  github.PrComment
+		localP     cover.CoverageList
+		baseP      cover.CoverageList
+		err        string
+		lenFiles   int
+		lenCovList int
+	}{
+		{
+			fullDiff:  true,
+			prComment: &clients.MockPrComment{},
+			localP: cover.CoverageList{
+				{FileName: "qiniu.com/kodo/apiserver/server/main.go", NCoveredStmts: 2, NAllStmts: 2},
+				{FileName: "qiniu.com/kodo/apiserver/server/test.go", NCoveredStmts: 2, NAllStmts: 2},
+			},
+			baseP: cover.CoverageList{
+				{FileName: "qiniu.com/kodo/apiserver/server/main.go", NCoveredStmts: 1, NAllStmts: 2},
+				{FileName: "qiniu.com/kodo/apiserver/server/test.go", NCoveredStmts: 1, NAllStmts: 2},
+			},
+			lenFiles:   2,
+			lenCovList: 2,
+		},
+		{
+			fullDiff:  false,
+			prComment: &clients.MockPrComment{GetPrChangedFilesErr: errors.New("mock error")},
+			err:       "mock error",
+		},
+		{
+			fullDiff:   false,
+			prComment:  &clients.MockPrComment{},
+			lenFiles:   0,
+			lenCovList: 0,
+		},
+		{
+			fullDiff:  false,
+			prComment: &clients.MockPrComment{GetPrChangedFilesRes: []string{"qiniu.com/kodo/apiserver/server/main.go"}},
+			localP: cover.CoverageList{
+				{FileName: "qiniu.com/kodo/apiserver/server/main.go", NCoveredStmts: 2, NAllStmts: 2},
+				{FileName: "qiniu.com/kodo/apiserver/server/test.go", NCoveredStmts: 2, NAllStmts: 2},
+			},
+			baseP: cover.CoverageList{
+				{FileName: "qiniu.com/kodo/apiserver/server/main.go", NCoveredStmts: 1, NAllStmts: 2},
+				{FileName: "qiniu.com/kodo/apiserver/server/test.go", NCoveredStmts: 1, NAllStmts: 2},
+			},
+			lenFiles:   1,
+			lenCovList: 1,
+		},
+	}
 
-//type MockErrorPrComment struct {
-//	*clients.MockPrComment
-//}
-//
-//func (s *MockErrorPrComment) GetPrChangedFiles() (files []string, err error) {
-//	return []string{"aaa"}, nil
-//}
-//
-//func TestGetFilesAndCovList(t *testing.T){
-//	items := []struct {
-//		fullDiff bool
-//		prComment github.PrComment
-//		localP cover.CoverageList
-//		baseP cover.CoverageList
-//	}{
-//		{
-//			inputFiles:  []string{"src/qiniu.com/kodo/io/io/io_svr.go", "README.md"},
-//			expectFiles: []string{"qiniu.com/kodo/io/io/io_svr.go", "README.md"},
-//		},
-//	}
-//
-//	for _, tc := range items {
-//		f := trimGhFileToProfile(tc.inputFiles)
-//		assert.Equal(t, f, tc.expectFiles)
-//	}
-//	getFilesAndCovList
-//}
+	for i, tc := range items {
+		fmt.Println(i)
+		files, covList, err := getFilesAndCovList(tc.fullDiff, tc.prComment, tc.localP, tc.baseP)
+		if err != nil {
+			assert.Equal(t, err.Error(), tc.err)
+		} else {
+			assert.Equal(t, len(files), tc.lenFiles)
+			assert.Equal(t, len(covList), tc.lenCovList)
+		}
+	}
+}
+
+func TestSetDeltaCovLinks(t *testing.T) {
+	covList := cover.DeltaCovList{{FileName: "file1", BasePer: "5%", NewPer: "5%", DeltaPer: "0"}}
+	j := &Job{
+		QiniuClient: &clients.MockQnClient{},
+	}
+	j.SetDeltaCovLinks(covList)
+}
+
+// functions to be done
+
+func TestRunPostsubmit(t *testing.T) {
+	j := &Job{}
+	err := j.RunPostsubmit()
+	assert.NoError(t, err)
+}
+
+func TestRunPeriodic(t *testing.T) {
+	j := &Job{}
+	err := j.RunPeriodic()
+	assert.NoError(t, err)
+}
+
+func TestFetch(t *testing.T) {
+	j := &Job{}
+	res := j.Fetch("buidID", "name")
+	assert.Equal(t, res, []byte{})
+}
diff --git a/pkg/qiniu/client.go b/pkg/qiniu/client.go
index 8b7f45e..640730d 100644
--- a/pkg/qiniu/client.go
+++ b/pkg/qiniu/client.go
@@ -58,7 +58,7 @@ type QnClient struct {
 	BucketManager *storage.BucketManager
 }
 
-// NewQnClient creates a new QnClient to work with qiniu cloud
+// NewClient creates a new QnClient to work with qiniu cloud
 func NewClient(cfg *Config) *QnClient {
 	return &QnClient{
 		cfg:           cfg,
diff --git a/pkg/qiniu/qnPresubmit.go b/pkg/qiniu/qnPresubmit.go
index b385f20..22ed770 100644
--- a/pkg/qiniu/qnPresubmit.go
+++ b/pkg/qiniu/qnPresubmit.go
@@ -107,20 +107,26 @@ func FindBaseProfileFromQiniu(qc Client, prowJobName, covProfileName string) ([]
 	return qc.ReadObject(profilePath)
 }
 
-// Artifacts prepresents the rule to store test artifacts in prow
-type Artifacts struct {
+type Artifacts interface {
+	ProfilePath() string
+	CreateChangedProfile() *os.File
+	GetChangedProfileName() string
+}
+
+// ProfileArtifacts prepresents the rule to store test artifacts in prow
+type ProfileArtifacts struct {
 	Directory          string
 	ProfileName        string
 	ChangedProfileName string // create temporary to save changed file related coverage profile
 }
 
 // ProfilePath returns a full path for profile
-func (a *Artifacts) ProfilePath() string {
+func (a *ProfileArtifacts) ProfilePath() string {
 	return path.Join(a.Directory, a.ProfileName)
 }
 
 // CreateChangedProfile creates a profile in order to store the most related files based on Github Pull Request
-func (a *Artifacts) CreateChangedProfile() *os.File {
+func (a *ProfileArtifacts) CreateChangedProfile() *os.File {
 	if a.ChangedProfileName == "" {
 		log.Fatalf("param Artifacts.ChangedProfileName should not be empty")
 	}
@@ -132,3 +138,7 @@ func (a *Artifacts) CreateChangedProfile() *os.File {
 
 	return p
 }
+
+func (a *ProfileArtifacts) GetChangedProfileName() string {
+	return a.ChangedProfileName
+}
diff --git a/pkg/qiniu/qnPresubmit_test.go b/pkg/qiniu/qnPresubmit_test.go
index dfb0d94..759e151 100644
--- a/pkg/qiniu/qnPresubmit_test.go
+++ b/pkg/qiniu/qnPresubmit_test.go
@@ -20,6 +20,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"os"
 )
 
 func TestFindBaseProfileFromQiniu(t *testing.T) {
@@ -39,3 +40,29 @@ func TestFindBaseProfileFromQiniu(t *testing.T) {
 	assert.Equal(t, err, nil)
 	assert.Equal(t, string(getProfile), mockProfileContent)
 }
+
+func TestArtifacts_ProfilePath(t *testing.T) {
+	p := &ProfileArtifacts{
+		Directory:   "directory/",
+		ProfileName: "profile",
+	}
+	profilePath := p.ProfilePath()
+	assert.Equal(t, profilePath, "directory/profile")
+}
+
+func TestProfileArtifacts_CreateChangedProfile(t *testing.T) {
+	p := &ProfileArtifacts{
+		ChangedProfileName: "test.cov",
+	}
+	file := p.CreateChangedProfile()
+	defer file.Close()
+	defer os.Remove(p.ChangedProfileName)
+}
+
+func TestProfileArtifacts_GetChangedProfileName(t *testing.T) {
+	p := &ProfileArtifacts{
+		ChangedProfileName: "change.cov",
+	}
+	name := p.GetChangedProfileName()
+	assert.Equal(t, name, "change.cov")
+}