How to use buildTestBinary method of cover Package

Best Syzkaller code snippet using cover.buildTestBinary

ut.go

Source:ut.go Github

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...92 if len(pkgs) != 1 {93 fmt.Println("package not exist", pkg)94 return false95 }96 err := buildTestBinary(pkg)97 if err != nil {98 fmt.Println("build package error", pkg, err)99 return false100 }101 exist, err := testBinaryExist(pkg)102 if err != nil {103 fmt.Println("check test binary existance error", err)104 return false105 }106 if !exist {107 fmt.Println("no test case in ", pkg)108 return false109 }110 res, err := listTestCases(pkg, nil)111 if err != nil {112 fmt.Println("list test cases for package error", err)113 return false114 }115 if len(args) == 2 {116 res, err = filterTestCases(res, args[1])117 if err != nil {118 fmt.Println("filter test cases error", err)119 return false120 }121 }122 for _, x := range res {123 fmt.Println(x.test)124 }125 }126 return true127}128func cmdBuild(args ...string) bool {129 pkgs, err := listPackages()130 if err != nil {131 fmt.Println("list package error", err)132 return false133 }134 // build all packages135 if len(args) == 0 {136 err := buildTestBinaryMulti(pkgs)137 if err != nil {138 fmt.Println("build package error", pkgs, err)139 return false140 }141 return true142 }143 // build test binary of a single package144 if len(args) >= 1 {145 pkg := args[0]146 err := buildTestBinary(pkg)147 if err != nil {148 fmt.Println("build package error", pkg, err)149 return false150 }151 }152 return true153}154func cmdRun(args ...string) bool {155 var err error156 pkgs, err := listPackages()157 if err != nil {158 fmt.Println("list packages error", err)159 return false160 }161 tasks := make([]task, 0, 5000)162 start := time.Now()163 // run all tests164 if len(args) == 0 {165 err := buildTestBinaryMulti(pkgs)166 if err != nil {167 fmt.Println("build package error", pkgs, err)168 return false169 }170 for _, pkg := range pkgs {171 exist, err := testBinaryExist(pkg)172 if err != nil {173 fmt.Println("check test binary existance error", err)174 return false175 }176 if !exist {177 fmt.Println("no test case in ", pkg)178 continue179 }180 tasks, err = listTestCases(pkg, tasks)181 if err != nil {182 fmt.Println("list test cases error", err)183 return false184 }185 }186 }187 // run tests for a single package188 if len(args) == 1 {189 pkg := args[0]190 err := buildTestBinary(pkg)191 if err != nil {192 fmt.Println("build package error", pkg, err)193 return false194 }195 exist, err := testBinaryExist(pkg)196 if err != nil {197 fmt.Println("check test binary existance error", err)198 return false199 }200 if !exist {201 fmt.Println("no test case in ", pkg)202 return false203 }204 tasks, err = listTestCases(pkg, tasks)205 if err != nil {206 fmt.Println("list test cases error", err)207 return false208 }209 }210 // run a single test211 if len(args) == 2 {212 pkg := args[0]213 err := buildTestBinary(pkg)214 if err != nil {215 fmt.Println("build package error", pkg, err)216 return false217 }218 exist, err := testBinaryExist(pkg)219 if err != nil {220 fmt.Println("check test binary existance error", err)221 return false222 }223 if !exist {224 fmt.Println("no test case in ", pkg)225 return false226 }227 tasks, err = listTestCases(pkg, tasks)228 if err != nil {229 fmt.Println("list test cases error", err)230 return false231 }232 tasks, err = filterTestCases(tasks, args[1])233 if err != nil {234 fmt.Println("filter test cases error", err)235 return false236 }237 }238 if except != "" {239 list, err := parseCaseListFromFile(except)240 if err != nil {241 fmt.Println("parse --except file error", err)242 return false243 }244 tmp := tasks[:0]245 for _, task := range tasks {246 if _, ok := list[task.String()]; !ok {247 tmp = append(tmp, task)248 }249 }250 tasks = tmp251 }252 if only != "" {253 list, err := parseCaseListFromFile(only)254 if err != nil {255 fmt.Println("parse --only file error", err)256 return false257 }258 tmp := tasks[:0]259 for _, task := range tasks {260 if _, ok := list[task.String()]; ok {261 tmp = append(tmp, task)262 }263 }264 tasks = tmp265 }266 fmt.Printf("building task finish, maxproc=%d, count=%d, takes=%v\n", P, len(tasks), time.Since(start))267 taskCh := make(chan task, 100)268 works := make([]numa, P)269 var wg sync.WaitGroup270 for i := 0; i < P; i++ {271 wg.Add(1)272 go works[i].worker(&wg, taskCh)273 }274 shuffle(tasks)275 start = time.Now()276 for _, task := range tasks {277 taskCh <- task278 }279 close(taskCh)280 wg.Wait()281 fmt.Println("run all tasks takes", time.Since(start))282 if junitfile != "" {283 out := collectTestResults(works)284 f, err := os.Create(junitfile)285 if err != nil {286 fmt.Println("create junit file fail:", err)287 return false288 }289 if err := write(f, out); err != nil {290 fmt.Println("write junit file error:", err)291 return false292 }293 }294 for _, work := range works {295 if work.Fail {296 return false297 }298 }299 if coverprofile != "" {300 collectCoverProfileFile()301 }302 return true303}304func parseCaseListFromFile(fileName string) (map[string]struct{}, error) {305 f, err := os.Open(fileName)306 if err != nil {307 return nil, withTrace(err)308 }309 defer f.Close()310 ret := make(map[string]struct{})311 s := bufio.NewScanner(f)312 for s.Scan() {313 line := s.Bytes()314 ret[string(line)] = struct{}{}315 }316 if err := s.Err(); err != nil {317 return nil, withTrace(err)318 }319 return ret, nil320}321// handleFlags strip the '--flag xxx' from the command line os.Args322// Example of the os.Args changes323// Before: ut run sessoin TestXXX --coverprofile xxx --junitfile yyy324// After: ut run session TestXXX325// The value of the flag is returned.326func handleFlags(flag string) string {327 var res string328 tmp := os.Args[:0]329 // Iter to the flag330 var i int331 for ; i < len(os.Args); i++ {332 if os.Args[i] == flag {333 i++334 break335 }336 tmp = append(tmp, os.Args[i])337 }338 // Handle the flag339 if i < len(os.Args) {340 res = os.Args[i]341 i++342 }343 // Iter the remain flags344 for ; i < len(os.Args); i++ {345 tmp = append(tmp, os.Args[i])346 }347 // os.Args is now the original flags with '--coverprofile XXX' removed.348 os.Args = tmp349 return res350}351func handleRaceFlag() (found bool) {352 tmp := os.Args[:0]353 for i := 0; i < len(os.Args); i++ {354 if os.Args[i] == "--race" {355 found = true356 continue357 }358 tmp = append(tmp, os.Args[i])359 }360 os.Args = tmp361 return362}363var junitfile string364var coverprofile string365var coverFileTempDir string366var race bool367var except string368var only string369func main() {370 junitfile = handleFlags("--junitfile")371 coverprofile = handleFlags("--coverprofile")372 except = handleFlags("--except")373 only = handleFlags("--only")374 race = handleRaceFlag()375 if coverprofile != "" {376 var err error377 coverFileTempDir, err = os.MkdirTemp(os.TempDir(), "cov")378 if err != nil {379 fmt.Println("create temp dir fail", coverFileTempDir)380 os.Exit(1)381 }382 defer os.Remove(coverFileTempDir)383 }384 // Get the correct count of CPU if it's in docker.385 P = runtime.GOMAXPROCS(0)386 rand.Seed(time.Now().Unix())387 var err error388 workDir, err = os.Getwd()389 if err != nil {390 fmt.Println("os.Getwd() error", err)391 }392 var isSucceed bool393 if len(os.Args) == 1 {394 // run all tests395 isSucceed = cmdRun()396 }397 if len(os.Args) >= 2 {398 switch os.Args[1] {399 case "list":400 isSucceed = cmdList(os.Args[2:]...)401 case "build":402 isSucceed = cmdBuild(os.Args[2:]...)403 case "run":404 isSucceed = cmdRun(os.Args[2:]...)405 default:406 isSucceed = usage()407 }408 }409 if !isSucceed {410 os.Exit(1)411 }412}413func collectCoverProfileFile() {414 // Combine all the cover file of single test function into a whole.415 files, err := os.ReadDir(coverFileTempDir)416 if err != nil {417 fmt.Println("collect cover file error:", err)418 os.Exit(-1)419 }420 w, err := os.Create(coverprofile)421 if err != nil {422 fmt.Println("create cover file error:", err)423 os.Exit(-1)424 }425 defer w.Close()426 w.WriteString("mode: set\n")427 result := make(map[string]*cover.Profile)428 for _, file := range files {429 if file.IsDir() {430 continue431 }432 collectOneCoverProfileFile(result, file)433 }434 w1 := bufio.NewWriter(w)435 for _, prof := range result {436 for _, block := range prof.Blocks {437 fmt.Fprintf(w1, "%s:%d.%d,%d.%d %d %d\n",438 prof.FileName,439 block.StartLine,440 block.StartCol,441 block.EndLine,442 block.EndCol,443 block.NumStmt,444 block.Count,445 )446 }447 if err := w1.Flush(); err != nil {448 fmt.Println("flush data to cover profile file error:", err)449 os.Exit(-1)450 }451 }452}453func collectOneCoverProfileFile(result map[string]*cover.Profile, file os.DirEntry) {454 f, err := os.Open(path.Join(coverFileTempDir, file.Name()))455 if err != nil {456 fmt.Println("open temp cover file error:", err)457 os.Exit(-1)458 }459 defer f.Close()460 profs, err := cover.ParseProfilesFromReader(f)461 if err != nil {462 fmt.Println("parse cover profile file error:", err)463 os.Exit(-1)464 }465 mergeProfile(result, profs)466}467func mergeProfile(m map[string]*cover.Profile, profs []*cover.Profile) {468 for _, prof := range profs {469 sort.Sort(blocksByStart(prof.Blocks))470 old, ok := m[prof.FileName]471 if !ok {472 m[prof.FileName] = prof473 continue474 }475 // Merge samples from the same location.476 // The data has already been sorted.477 tmp := old.Blocks[:0]478 var i, j int479 for i < len(old.Blocks) && j < len(prof.Blocks) {480 v1 := old.Blocks[i]481 v2 := prof.Blocks[j]482 switch compareProfileBlock(v1, v2) {483 case -1:484 tmp = appendWithReduce(tmp, v1)485 i++486 case 1:487 tmp = appendWithReduce(tmp, v2)488 j++489 default:490 tmp = appendWithReduce(tmp, v1)491 tmp = appendWithReduce(tmp, v2)492 i++493 j++494 }495 }496 for ; i < len(old.Blocks); i++ {497 tmp = appendWithReduce(tmp, old.Blocks[i])498 }499 for ; j < len(prof.Blocks); j++ {500 tmp = appendWithReduce(tmp, prof.Blocks[j])501 }502 m[prof.FileName] = old503 }504}505// appendWithReduce works like append(), but it merge the duplicated values.506func appendWithReduce(input []cover.ProfileBlock, b cover.ProfileBlock) []cover.ProfileBlock {507 if len(input) >= 1 {508 last := &input[len(input)-1]509 if b.StartLine == last.StartLine &&510 b.StartCol == last.StartCol &&511 b.EndLine == last.EndLine &&512 b.EndCol == last.EndCol {513 if b.NumStmt != last.NumStmt {514 panic(fmt.Errorf("inconsistent NumStmt: changed from %d to %d", last.NumStmt, b.NumStmt))515 }516 // Merge the data with the last one of the slice.517 last.Count |= b.Count518 return input519 }520 }521 return append(input, b)522}523type blocksByStart []cover.ProfileBlock524func compareProfileBlock(x, y cover.ProfileBlock) int {525 if x.StartLine < y.StartLine {526 return -1527 }528 if x.StartLine > y.StartLine {529 return 1530 }531 // Now x.StartLine == y.StartLine532 if x.StartCol < y.StartCol {533 return -1534 }535 if x.StartCol > y.StartCol {536 return 1537 }538 return 0539}540func (b blocksByStart) Len() int { return len(b) }541func (b blocksByStart) Swap(i, j int) { b[i], b[j] = b[j], b[i] }542func (b blocksByStart) Less(i, j int) bool {543 bi, bj := b[i], b[j]544 return bi.StartLine < bj.StartLine || bi.StartLine == bj.StartLine && bi.StartCol < bj.StartCol545}546func listTestCases(pkg string, tasks []task) ([]task, error) {547 newCases, err := listNewTestCases(pkg)548 if err != nil {549 fmt.Println("list test case error", pkg, err)550 return nil, withTrace(err)551 }552 for _, c := range newCases {553 tasks = append(tasks, task{pkg, c})554 }555 return tasks, nil556}557func filterTestCases(tasks []task, arg1 string) ([]task, error) {558 if strings.HasPrefix(arg1, "r:") {559 r, err := regexp.Compile(arg1[2:])560 if err != nil {561 return nil, err562 }563 tmp := tasks[:0]564 for _, task := range tasks {565 if r.MatchString(task.test) {566 tmp = append(tmp, task)567 }568 }569 return tmp, nil570 }571 tmp := tasks[:0]572 for _, task := range tasks {573 if strings.Contains(task.test, arg1) {574 tmp = append(tmp, task)575 }576 }577 return tmp, nil578}579func listPackages() ([]string, error) {580 cmd := exec.Command("go", "list", "./...")581 ss, err := cmdToLines(cmd)582 if err != nil {583 return nil, withTrace(err)584 }585 ret := ss[:0]586 for _, s := range ss {587 if !strings.HasPrefix(s, modulePath) {588 continue589 }590 pkg := s[len(modulePath)+1:]591 if skipDIR(pkg) {592 continue593 }594 ret = append(ret, pkg)595 }596 return ret, nil597}598type numa struct {599 Fail bool600 results []testResult601}602func (n *numa) worker(wg *sync.WaitGroup, ch chan task) {603 defer wg.Done()604 for t := range ch {605 res := n.runTestCase(t.pkg, t.test)606 if res.Failure != nil {607 fmt.Println("[FAIL] ", t.pkg, t.test)608 fmt.Fprintf(os.Stderr, "err=%s\n%s", res.err.Error(), res.Failure.Contents)609 n.Fail = true610 }611 n.results = append(n.results, res)612 }613}614type testResult struct {615 JUnitTestCase616 d time.Duration617 err error618}619func (n *numa) runTestCase(pkg string, fn string) testResult {620 res := testResult{621 JUnitTestCase: JUnitTestCase{622 Classname: path.Join(modulePath, pkg),623 Name: fn,624 },625 }626 var buf bytes.Buffer627 var err error628 var start time.Time629 for i := 0; i < 3; i++ {630 cmd := n.testCommand(pkg, fn)631 cmd.Dir = path.Join(workDir, pkg)632 // Combine the test case output, so the run result for failed cases can be displayed.633 cmd.Stdout = &buf634 cmd.Stderr = &buf635 start = time.Now()636 err = cmd.Run()637 if err != nil {638 if _, ok := err.(*exec.ExitError); ok {639 // Retry 3 times to get rid of the weird error:640 switch err.Error() {641 case "signal: segmentation fault (core dumped)":642 buf.Reset()643 continue644 case "signal: trace/breakpoint trap (core dumped)":645 buf.Reset()646 continue647 }648 if strings.Contains(buf.String(), "panic during panic") {649 buf.Reset()650 continue651 }652 }653 }654 break655 }656 if err != nil {657 res.Failure = &JUnitFailure{658 Message: "Failed",659 Contents: buf.String(),660 }661 res.err = err662 }663 res.d = time.Since(start)664 res.Time = formatDurationAsSeconds(res.d)665 return res666}667func collectTestResults(workers []numa) JUnitTestSuites {668 version := goVersion()669 // pkg => test cases670 pkgs := make(map[string][]JUnitTestCase)671 durations := make(map[string]time.Duration)672 // The test result in workers are shuffled, so group by the packages here673 for _, n := range workers {674 for _, res := range n.results {675 cases, ok := pkgs[res.Classname]676 if !ok {677 cases = make([]JUnitTestCase, 0, 10)678 }679 cases = append(cases, res.JUnitTestCase)680 pkgs[res.Classname] = cases681 durations[res.Classname] = durations[res.Classname] + res.d682 }683 }684 suites := JUnitTestSuites{}685 // Turn every package result to a suite.686 for pkg, cases := range pkgs {687 suite := JUnitTestSuite{688 Tests: len(cases),689 Failures: failureCases(cases),690 Time: formatDurationAsSeconds(durations[pkg]),691 Name: pkg,692 Properties: packageProperties(version),693 TestCases: cases,694 }695 suites.Suites = append(suites.Suites, suite)696 }697 return suites698}699func failureCases(input []JUnitTestCase) int {700 sum := 0701 for _, v := range input {702 if v.Failure != nil {703 sum++704 }705 }706 return sum707}708func (n *numa) testCommand(pkg string, fn string) *exec.Cmd {709 args := make([]string, 0, 10)710 exe := "./" + testFileName(pkg)711 if coverprofile != "" {712 fileName := strings.ReplaceAll(pkg, "/", "_") + "." + fn713 tmpFile := path.Join(coverFileTempDir, fileName)714 args = append(args, "-test.coverprofile", tmpFile)715 }716 args = append(args, "-test.cpu", "1")717 if !race {718 args = append(args, []string{"-test.timeout", "2m"}...)719 } else {720 // it takes a longer when race is enabled. so it is set more timeout value.721 args = append(args, []string{"-test.timeout", "30m"}...)722 }723 // session.test -test.run TestClusteredPrefixColum724 args = append(args, "-test.run", fn)725 return exec.Command(exe, args...)726}727func skipDIR(pkg string) bool {728 skipDir := []string{"br", "cmd", "dumpling"}729 for _, ignore := range skipDir {730 if strings.HasPrefix(pkg, ignore) {731 return true732 }733 }734 return false735}736func buildTestBinary(pkg string) error {737 // go test -c738 cmd := exec.Command("go", "test", "-c", "-vet", "off", "-o", testFileName(pkg))739 if coverprofile != "" {740 cmd.Args = append(cmd.Args, "-cover")741 }742 if race {743 cmd.Args = append(cmd.Args, "-race")744 }745 cmd.Dir = path.Join(workDir, pkg)746 cmd.Stdout = os.Stdout747 cmd.Stderr = os.Stderr748 if err := cmd.Run(); err != nil {749 return withTrace(err)750 }751 return nil752}753// buildTestBinaryMulti is much faster than build the test packages one by one.754func buildTestBinaryMulti(pkgs []string) error {755 // go test --exec=xprog -cover -vet=off --count=0 $(pkgs)756 xprogPath := path.Join(workDir, "tools/bin/xprog")757 packages := make([]string, 0, len(pkgs))758 for _, pkg := range pkgs {759 packages = append(packages, path.Join(modulePath, pkg))760 }761 var cmd *exec.Cmd762 cmd = exec.Command("go", "test", "--exec", xprogPath, "-vet", "off", "-count", "0")763 if coverprofile != "" {764 cmd.Args = append(cmd.Args, "-cover")765 }766 if race {767 cmd.Args = append(cmd.Args, "-race")768 }...

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report_test.go

Source:report_test.go Github

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...95 t.Fatalf("got no error, but expected %q", test.Result)96 }97 _ = rep98}99func buildTestBinary(t *testing.T, target *targets.Target, test Test, dir string) string {100 kcovSrc := filepath.Join(dir, "kcov.c")101 kcovObj := filepath.Join(dir, "kcov.o")102 if err := osutil.WriteFile(kcovSrc, []byte(`103#include <stdio.h>104void __sanitizer_cov_trace_pc() { printf("%llu", (long long)__builtin_return_address(0)); }105`)); err != nil {106 t.Fatal(err)107 }108 kcovFlags := append([]string{"-c", "-w", "-x", "c", "-o", kcovObj, kcovSrc}, target.CFlags...)109 src := filepath.Join(dir, "main.c")110 bin := filepath.Join(dir, "bin")111 if err := osutil.WriteFile(src, []byte(`int main() {}`)); err != nil {112 t.Fatal(err)113 }114 if _, err := osutil.RunCmd(time.Hour, "", target.CCompiler, kcovFlags...); err != nil {115 t.Fatal(err)116 }117 flags := append(append([]string{"-w", "-o", bin, src, kcovObj}, target.CFlags...), test.CFlags...)118 if _, err := osutil.RunCmd(time.Hour, "", target.CCompiler, flags...); err != nil {119 errText := err.Error()120 errText = strings.ReplaceAll(errText, "‘", "'")121 errText = strings.ReplaceAll(errText, "’", "'")122 if strings.Contains(errText, "error: unrecognized command line option '-fsanitize-coverage=trace-pc'") &&123 (os.Getenv("SYZ_BIG_ENV") == "" || target.OS == "akaros") {124 t.Skip("skipping test, -fsanitize-coverage=trace-pc is not supported")125 }126 t.Fatal(err)127 }128 return bin129}130func generateReport(t *testing.T, target *targets.Target, test Test) ([]byte, error) {131 dir, err := ioutil.TempDir("", "syz-cover-test")132 if err != nil {133 t.Fatal(err)134 }135 defer os.RemoveAll(dir)136 bin := buildTestBinary(t, target, test, dir)137 rg, err := MakeReportGenerator(target, bin, dir, dir)138 if err != nil {139 return nil, err140 }141 if test.Result == "" {142 var pcs []uint64143 if output, err := osutil.RunCmd(time.Minute, "", bin); err == nil {144 pc, err := strconv.ParseUint(string(output), 10, 64)145 if err != nil {146 t.Fatal(err)147 }148 pcs = append(pcs, PreviousInstructionPC(target, pc))149 t.Logf("using exact coverage PC 0x%x", pcs[0])150 } else if target.OS == runtime.GOOS && (target.Arch == runtime.GOARCH || target.VMArch == runtime.GOARCH) {...

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buildTestBinary

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1import "fmt"2func main() {3 fmt.Println("Hello, world.")4}5import "fmt"6func main() {7 fmt.Println("Hello, world.")8}9import "fmt"10func main() {11 fmt.Println("Hello, world.")12}13import "fmt"14func main() {15 fmt.Println("Hello, world.")16}17import "fmt"18func main() {19 fmt.Println("Hello, world.")20}21import "fmt"22func main() {23 fmt.Println("Hello, world.")24}25import "fmt"26func main() {27 fmt.Println("Hello, world.")28}29import "fmt"30func main() {31 fmt.Println("Hello, world.")32}33import "fmt"34func main() {35 fmt.Println("Hello, world.")36}37import "fmt"38func main() {39 fmt.Println("Hello, world.")40}41import "fmt"42func main() {43 fmt.Println("Hello, world.")44}45import "fmt"46func main() {47 fmt.Println("Hello, world.")48}49import "fmt"50func main() {51 fmt.Println("Hello, world.")52}

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buildTestBinary

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1import (2func main() {3 fmt.Println("Hello, playground")4 fmt.Println(os.Args[1])5}6import (7func main() {8 fmt.Println("Hello, playground")9 fmt.Println(os.Args[1])10}11import (12func main() {13 fmt.Println("Hello, playground")14 fmt.Println(os.Args[1])15}16import (17func main() {18 fmt.Println("Hello, playground")19 fmt.Println(os.Args[1])20}21import (22func main() {23 fmt.Println("Hello, playground")24 fmt.Println(os.Args[1])25}26import (27func main() {28 fmt.Println("Hello, playground")29 fmt.Println(os.Args[1])30}31import (32func main() {33 fmt.Println("Hello, playground")34 fmt.Println(os.Args[1])35}36import (37func main() {38 fmt.Println("Hello, playground")39 fmt.Println(os.Args[1])40}41import (42func main() {43 fmt.Println("Hello, playground")44 fmt.Println(os.Args[1])45}46import (

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buildTestBinary

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1import (2func BuildTestBinary(pkg string, testBinary string) error {3 fmt.Println("Building test binary for package", pkg)4 cmd := exec.Command("go", "test", "-c", "-o", testBinary, pkg)5 if err := cmd.Run(); err != nil {6 return fmt.Errorf("failed to build test binary: %v", err)7 }8}9func RunTestBinary(testBinary string) (string, error) {10 fmt.Println("Running test binary", testBinary)11 cmd := exec.Command(testBinary)12 out, err := cmd.Output()13 if err != nil {14 return "", fmt.Errorf("failed to run test binary: %v", err)15 }16 return string(out), nil17}18func ParseCoverProfile(coverProfile string) ([]byte, error) {19 fmt.Println("Parsing coverage profile", coverProfile)20 cmd := exec.Command("go", "tool", "cover", "-func", coverProfile)21 out, err := cmd.Output()22 if err != nil {23 return nil, fmt.Errorf("failed to parse coverage profile: %v", err)24 }25}26func GetTestBinary(pkg string) string {27 return filepath.Join(os.TempDir(), strings.Replace(pkg, "/", "_", -1))28}29func GetCoverProfile(pkg string) string {30 return GetTestBinary(pkg) + ".coverprofile"31}32func Run(pkg string) ([]byte, error) {

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buildTestBinary

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1import (2func main() {3 cmd := exec.Command("go", "build", "-o", "testBinary", "-covermode=count", "test.go")4 err := cmd.Run()5 if err != nil {6 fmt.Println(err)7 }8}9import (10func main() {11 cmd := exec.Command("go", "build", "-o", "testBinary", "-covermode=atomic", "test.go")12 err := cmd.Run()13 if err != nil {14 fmt.Println(err)15 }16}17import (18func main() {19 cmd := exec.Command("go", "build", "-o", "testBinary", "-covermode=atomic", "-coverpkg=github.com/abc/test", "test.go")20 err := cmd.Run()21 if err != nil {22 fmt.Println(err)23 }24}25import (26func main() {27 cmd := exec.Command("go", "build", "-o", "testBinary", "-covermode=atomic", "-coverpkg=github.com/abc/test/...", "test.go")28 err := cmd.Run()29 if err != nil {30 fmt.Println(err)31 }32}33import (34func main() {35 cmd := exec.Command("go", "build", "-o", "testBinary", "-covermode=atomic", "-coverpkg=github.com/abc/test/...", "test.go")36 err := cmd.Run()37 if err != nil {38 fmt.Println(err)39 }40}

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buildTestBinary

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1import (2func main() {3 dir, err := os.Getwd()4 if err != nil {5 fmt.Println(err)6 os.Exit(1)7 }8 parentDir := filepath.Dir(dir)9 fmt.Println("Parent directory: ", parentDir)10 grandParentDir := filepath.Dir(parentDir)11 fmt.Println("Grand Parent directory: ", grandParentDir)12 greatGrandParentDir := filepath.Dir(grandParentDir)13 fmt.Println("Great Grand Parent directory: ", greatGrandParentDir)14 greatGreatGrandParentDir := filepath.Dir(greatGrandParentDir)15 fmt.Println("Great Great Grand Parent directory: ", greatGreatGrandParentDir)16 greatGreatGreatGrandParentDir := filepath.Dir(greatGreatGrandParentDir)17 fmt.Println("Great Great Great Grand Parent directory: ", greatGreatGreatGrandParentDir)18 greatGreatGreatGreatGrandParentDir := filepath.Dir(greatGreatGreatGrandParentDir)19 fmt.Println("Great Great Great Great Grand Parent directory: ", greatGreatGreatGreatGrandParentDir)20 greatGreatGreatGreatGreatGrandParentDir := filepath.Dir(greatGreatGreatGreatGrandParentDir)21 fmt.Println("Great Great Great Great Great Grand Parent directory: ", greatGreatGreatGreatGreatGrandParentDir)22 greatGreatGreatGreatGreatGreatGrandParentDir := filepath.Dir(greatGreatGreatGreatGreatGrandParentDir)23 fmt.Println("Great Great Great Great Great Great Grand Parent directory: ", greatGreatGreatGreatGreatGreatGrandParentDir)24 greatGreatGreatGreatGreatGreatGreatGrandParentDir := filepath.Dir(greatGreatGreatGreatGreatGreatGrandParentDir)25 fmt.Println("Great Great Great Great Great Great Great Grand Parent directory: ", greatGreatGreatGreatGreatGreatGreatGrandParentDir)

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buildTestBinary

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1import (2func main() {3 fmt.Println("main()")4 gobuildtest.BuildTestBinary()5}6import (7func main() {8 fmt.Println("main()")9 gobuildtest.BuildTestBinary()10}11import (12func main() {13 fmt.Println("main()")14 gobuildtest.BuildTestBinary()15}16import (17func main() {18 fmt.Println("main()")19 gobuildtest.BuildTestBinary()20}21import (22func main() {23 fmt.Println("main()")24 gobuildtest.BuildTestBinary()25}26import (27func main() {28 fmt.Println("main()")29 gobuildtest.BuildTestBinary()30}31import (32func main() {33 fmt.Println("main()")34 gobuildtest.BuildTestBinary()35}

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buildTestBinary

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1import (2func main() {3 fmt.Println("Hello, playground")4 cover.BuildTestBinary()5}62. Create a test file (test.go) in the same directory as the above file. The test file should have the following code:7import (8func main() {9 fmt.Println("Hello, playground")10 cover.BuildTestBinary()11}12import (13func BuildTestBinary() {14 fmt.Println("Hello, playground")15 testing.MainStart(nil, nil, nil, nil)16}17--- FAIL: TestMain (0.00s)18testing.tRunner.func1(0xc4200c4000)19panic(0x4a2aa0, 0x4b4a60)20flag.(*FlagSet).Var(0xc42002a0c0, 0x4b3b60, 0xc4200b9c40, 0x48c2b2, 0x10, 0x48d1e5, 0x29)21flag.(*FlagSet).StringVar(0xc42002a0c0, 0xc4200b9c40, 0x48c2b2, 0x10, 0x0, 0x0, 0x48

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buildTestBinary

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1import (2type Cover struct {3}4func (c *Cover) BuildTestBinary() error {5 cmd := exec.Command("go", "test", "-c", "-o", c.TestBinaryFilePath, c.TestFilePath)6 err := cmd.Run()7 if err != nil {8 }9}10func (c *Cover) RunTestBinary() error {11 cmd := exec.Command(c.TestBinaryFilePath)12 err := cmd.Run()13 if err != nil {14 }15}16func (c *Cover) GenerateCoverageProfile() error {17 cmd := exec.Command("go", "tool", "cover", "-func", c.CoverageProfilePath)18 err := cmd.Run()19 if err != nil {20 }21}22func (c *Cover) GenerateCoverageReport() error {23 cmd := exec.Command("go", "tool", "cover", "-html", c.CoverageProfilePath, "-o", c.CoverageReportPath)

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