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How to use TestFlags method of prog Package

Best Syzkaller code snippet using prog.TestFlags

cmd.go

Source:cmd.go

1package main2import (3	"bytes"4	"flag"5	"fmt"6	"go/ast"7	"go/build"8	"io"9	"io/ioutil"10	"log"11	"os"12	"os/exec"13	"path/filepath"14	"strconv"15	"strings"16	"github.com/mailgun/godebug/Godeps/_workspace/src/bitbucket.org/JeremySchlatter/go-atexit"17	"github.com/mailgun/godebug/Godeps/_workspace/src/github.com/kisielk/gotool"18	"github.com/mailgun/godebug/Godeps/_workspace/src/golang.org/x/tools/go/loader"19	"github.com/mailgun/godebug/gen"20)21var (22	outputFlags flag.FlagSet23	w           = outputFlags.Bool("w", false, "write result to (source) file instead of stdout")24	runFlags   flag.FlagSet25	instrument = runFlags.String("instrument", "", "extra packages to enable for debugging")26	work       = runFlags.Bool("godebugwork", false, "print the name of the temporary work directory and do not delete it when exiting")27	tags       = runFlags.String("tags", "", "go build tags")28	buildFlags = runFlags29	o          = buildFlags.String("o", "", "output binary name")30	testFlags = buildFlags31	c         = testFlags.Bool("c", false, "compile the test binary but do not run it")32)33func init() {34	// Hack for godebug's CI system. The CI can't override PATH in its builders,35	// but it can set new environment variables.36	if p := os.Getenv("GODEBUG_GO_PATH"); p != "" {37		os.Setenv("PATH", p+string(filepath.ListSeparator)+os.Getenv("PATH"))38	}39}40func usage() {41	log.Print(42		`godebug is a tool for debugging Go programs.43Usage:44        godebug command [arguments]45The commands are:46    build     compile a debug-ready Go program47    run       compile, run, and debug a Go program48    test      compile, run, and debug Go package tests49Use "godebug help [command]" for more information about a command.50`)51	exit(0)52}53const commonArgsUsage = `54By default, godebug generates debugging code only for the named55Go source files, and not their dependencies. This means that in56the debugging session you will not be able to step into function57calls from imported packages. To instrument other packages,58pass the -instrument flag. Packages are comma-separated and59must not be relative.60If -godebugwork is set, godebug will print the name of the61temporary work directory and not delete it when exiting.62-tags works like in 'go help build'.63`64func runUsage() {65	log.Print(66		`usage: godebug run [-godebugwork] [-instrument pkgs...] [-tags 'tag list'] gofiles... [--] [arguments...]67Run emulates 'go run' behavior. It generates debugging code for the68named *.go files and then compiles and executes the result.69Like 'go run' it takes a list of go files which are treated as a70single main package. The rest of the arguments is passed to the71binary. Optionally, a '--' argument ends the list of gofiles.72` + commonArgsUsage)73}74func buildUsage() {75	log.Print(76		`usage: godebug build [-godebugwork] [-instrument pkgs...] [-tags 'tag list'] [-o output] [package]77Build is a wrapper around 'go build'. It generates debugging code for78the named target and builds the result.79Like 'go build' it takes a single main package. If arguments are a list80of *.go files they are treated as a single package. Relative packages are81not supported - which means you can't leave the package name out, too.82The output file naming if -o is not passed works like 'go build' (see83'go help build') with the addition of the suffix '.debug'.84` + commonArgsUsage)85}86func testUsage() {87	log.Print(88		`usage: godebug test [-godebugwork] [-instrument pkgs...] [-tags 'tag list'] [-c] [-o output] [packages] [flags for test binary]89Test is a wrapper around 'go test'. It generates debugging code for90the tests in the named packages and runs 'go test' on the result.91As with 'go test', by default godebug test needs no arguments.92Flags parsing, -c and -o work like for 'go test' - see 'go help test'.93The default binary name for -c has the suffix '.test.debug'.94See also: 'go help testflag'. Note that you have to use the 'test.'95prefix like '-test.v'.96` + commonArgsUsage)97}98func outputUsage() {99	log.Print(100		`usage: godebug output [-w] <packages>101Output outputs debugging code for <packages>.102By default, output will print the resulting code to stdout.103If the -w flag is given, output will overwrite the original104source files. Use with caution.105<packages> may take one of two forms:106    1. A list of *.go source files.107       All of the specified files are loaded, parsed and type-checked108       as a single package.  All the files must belong to the same directory.109    2. A list of import paths, each denoting a package.110       The package's directory is found relative to the $GOROOT and111       $GOPATH using similar logic to 'go build', and the *.go files in112       that directory are loaded, parsed and type-checked as a single113       package.114       In addition, all *_test.go files in the directory are then loaded115       and parsed.  Those files whose package declaration equals that of116       the non-*_test.go files are included in the primary package.  Test117       files whose package declaration ends with "_test" are type-checked118       as another package, the 'external' test package, so that a single119       import path may denote two packages.120`)121}122func main() {123	log.SetFlags(0)124	atexit.TrapSignals()125	defer atexit.CallExitFuncs()126	if len(os.Args) == 1 {127		usage()128	}129	switch os.Args[1] {130	case "help":131		doHelp(os.Args[2:])132	case "output":133		doOutput(os.Args[2:])134	case "run":135		doRun(os.Args[2:])136	case "build":137		doBuild(os.Args[2:])138	case "test":139		doTest(os.Args[2:])140	default:141		usage()142	}143}144func doHelp(args []string) {145	if len(args) == 0 {146		usage()147	}148	switch args[0] {149	case "output":150		outputUsage()151	case "run":152		runUsage()153	case "build":154		buildUsage()155	case "test":156		testUsage()157	default:158		log.Printf("Unknown help topic `%s`. Run 'godebug help'.\n", args[0])159	}160}161func doBuild(args []string) {162	exitIfErr(buildFlags.Parse(args))163	goArgs, isPkg := parseBuildArguments(buildFlags.Args())164	conf := newLoader()165	if isPkg {166		conf.Import(goArgs[0])167	} else {168		exitIfErr(conf.CreateFromFilenames("main", goArgs...))169	}170	tmpDir := generateSourceFiles(&conf, "build")171	tmpFile := filepath.Join(tmpDir, "godebug.-i.a.out")172	if doGopathWorkaround {173		// Rebuild stale packages, since this version of Go will not do so by default.174		shellGo("", []string{"build", "-o", tmpFile, "-tags", *tags, "-i"}, goArgs)175	}176	if isPkg {177		goArgs = mapPkgsToTmpDir(goArgs)178	} else {179		goArgs = mapToTmpDir(tmpDir, goArgs)180	}181	bin := filepath.Base(strings.TrimSuffix(goArgs[0], ".go")) + ".debug"182	if *o != "" {183		bin = *o184	}185	shellGo(tmpDir, []string{"build", "-o", bin, "-tags", *tags}, goArgs)186}187func doRun(args []string) {188	// Parse arguments.189	exitIfErr(runFlags.Parse(args))190	// Separate the .go files from the arguments to the binary we're building.191	gofiles, rest := getGoFiles()192	if len(gofiles) == 0 {193		logFatal("godebug run: no go files listed")194	}195	// Build a loader.Config from the .go files.196	conf := newLoader()197	exitIfErr(conf.CreateFromFilenames("main", gofiles...))198	tmpDir := generateSourceFiles(&conf, "run")199	if doGopathWorkaround {200		// Rebuild stale packages, since this version of Go will not do so by default.201		shellGo("", []string{"build", "-o", os.DevNull, "-tags", *tags, "-i"},202			gofiles)203	}204	// Run 'go build', then run the binary.205	// We do this rather than invoking 'go run' directly so we can implement206	// the '--' argument, which 'go run' does not have.207	bin := filepath.Join(tmpDir, "godebug.a.out")208	shellGo(tmpDir, []string{"build", "-tags", *tags, "-o", bin},209		mapToTmpDir(tmpDir, gofiles))210	shell("", bin, rest...)211}212func doTest(args []string) {213	// Parse arguments.214	packages, testFlags := parseTestArguments(args)215	// Default to the package in the current directory.216	if len(packages) == 0 {217		packages = []string{"."}218	}219	// Expand ...220	packages = gotool.ImportPaths(packages)221	if len(packages) > 1 && (*c || *o != "") {222		logFatal("godebug test: cannot use -c or -o flag with multiple packages")223	}224	// Build a loader.Config from the provided packages.225	conf := newLoader()226	for _, pkg := range packages {227		exitIfErr(conf.ImportWithTests(pkg))228	}229	tmpDir := generateSourceFiles(&conf, "test")230	wd := getwd()231	// Run 'go test -i' once without changing the GOPATH.232	// This will recompile and install any out-of-date packages.233	// When we modify the GOPATH in the next invocation of the go tool,234	// it will not check if any of the uninstrumented dependencies are out-of-date.235	shellGo("", []string{"test", "-tags", *tags, "-i"}, packages)236	// The target binary goes to -o if specified, otherwise to the default name237	// if -c is specified, otherwise to the temporary directory.238	bin := filepath.Join(tmpDir, "godebug-test-bin.test")239	if *c {240		bin = filepath.Base(mapPkgsToTmpDir(packages)[0]) + ".test.debug"241	}242	if *o != "" {243		bin = abs(*o)244	}245	// First compile the test with -c and then run the binary directly.246	// This resolves some issues that came up with running 'go test' directly:247	//    (1) 'go test' changes the working directory to that of the source files of the test.248	//    (2) 'go test' does not forward stdin to the test binary.249	// Do it once for each package since we can't use -c with multiple packages.250	for _, pkg := range mapPkgsToTmpDir(packages) {251		if len(packages) > 1 {252			fmt.Println("===", pkg)253			os.Remove(bin)254		}255		goArgs := []string{"test", "-tags", *tags, "-c", "-o", bin}256		shellGo(tmpDir, goArgs, []string{pkg})257		// Skip execution if no binary was generated (no test files) or -c was passed258		if _, err := os.Stat(bin); err == nil && !*c {259			_, dir := findUnderGopath(wd, pkg)260			os.Chdir(dir)261			shell("", bin, testFlags...)262			os.Chdir(wd)263		}264	}265}266func generateSourceFiles(conf *loader.Config, subcommand string) (tmpDirPath string) {267	// Make a temp directory.268	tmpDir := makeTmpDir()269	if *work {270		// Print the name of the directory and don't clean it up on exit.271		fmt.Println(tmpDir)272	} else {273		// Clean up the directory on exit.274		atexit.Run(func() {275			removeDir(tmpDir)276		})277	}278	// Load the whole program from source files. This almost certainly causes more work than we need to do,279	// but it's an easy fix for a few problems I've encountered. Deleting this may be a good target for280	// future optimization work.281	conf.SourceImports = true282	// Mark the extra packages we want to instrument.283	var pkgs []string284	*instrument = strings.Trim(*instrument, ", ")285	if *instrument != "" {286		pkgs = strings.Split(*instrument, ",")287	}288	all := false289	for _, pkg := range pkgs {290		// check for the special reserved package names: "main", "all", and "std"291		// see 'go help packages'292		switch pkg {293		case "main":294			switch subcommand {295			case "run": // The main package is always instrumented anyway. Carry on.296			case "test":297				logFatal(`godebug test: can't pass reserved name "main" in the -instrument flag.`)298			}299		case "all":300			if !all {301				all = true302				fmt.Println(`godebug run: heads up: "all" means "all except std". godebug can't step into the standard library yet.` + "\n")303			}304		case "std":305			logFatalf("godebug %s: reserved name \"std\" cannot be passed in the -instrument flag."+306				"\ngodebug cannot currently instrument packages in the standard library."+307				"\nDo you wish it could? Chime in at https://github.com/mailgun/godebug/issues/12",308				subcommand)309		default:310			for _, path := range gotool.ImportPaths([]string{pkg}) { // wildcard "..." expansion311				conf.Import(path)312			}313		}314	}315	// Load the program.316	prog, err := conf.Load()317	exitIfErr(err)318	// If we're in "all" mode, mark all but the standard library packages and godebug itself for instrumenting.319	stdLib := getStdLibPkgs()320	if all {321		markAlmostAllPackages(prog, stdLib)322	}323	// Warn the user if they have breakpoints set in files that we are not instrumenting.324	checkForUnusedBreakpoints(subcommand, prog, stdLib)325	// Generate debugging-enabled source files.326	wd := getwd()327	gen.Generate(prog, ioutil.ReadFile, func(importPath, filename string) io.WriteCloser {328		if importPath == "main" {329			filename = filepath.Join(tmpDir, filepath.Base(filename))330		} else {331			importPath, _ = findUnderGopath(wd, importPath)332			exitIfErr(os.MkdirAll(filepath.Join(tmpDir, "src", importPath), 0770))333			filename = filepath.Join(tmpDir, "src", importPath, filepath.Base(filename))334		}335		return createFileHook(filename, tmpDir)336	})337	return tmpDir338}339func newLoader() loader.Config {340	var conf loader.Config341	b := build.Default342	b.BuildTags = append(b.BuildTags, strings.Split(*tags, " ")...)343	conf.Build = &b344	return conf345}346func checkForUnusedBreakpoints(subcommand string, prog *loader.Program, stdLib map[string]bool) {347	initialPkgs := make(map[*loader.PackageInfo]bool)348	for _, pkg := range prog.InitialPackages() {349		initialPkgs[pkg] = true350	}351	// For now we'll look at all of the non-stdlib-source files.352	// As an optimization, we could just look at files that have been changed.353	for _, pkg := range prog.AllPackages {354		if stdLib[pkg.String()] || initialPkgs[pkg] {355			continue356		}357		for _, f := range pkg.Files {358			ast.Inspect(f, func(node ast.Node) bool {359				if gen.IsBreakpoint(node) {360					pos := prog.Fset.Position(node.Pos())361					fmt.Printf("godebug %s: Ignoring breakpoint at %s:%d because package %q has not been flagged for instrumentation. See 'godebug help %s'.\n\n",362						subcommand, filepath.Join(pkg.String(), filepath.Base(pos.Filename)), pos.Line, pkg.Pkg.Name(), subcommand)363				}364				return true365			})366		}367	}368}369func markAlmostAllPackages(prog *loader.Program, stdLib map[string]bool) {370	for _, pkg := range prog.AllPackages {371		path := pkg.String()372		switch {373		// skip this package if...374		case stdLib[path]: // it's part of the standard library375		case prog.ImportMap[path] == nil: // it's a Created package376		case strings.HasPrefix(path, "github.com/mailgun/godebug"):377			// it's the godebug library or one of its dependecies378		// otherwise include it379		default:380			prog.Imported[pkg.String()] = pkg381		}382	}383}384func getGoFiles() (gofiles, rest []string) {385	for i, arg := range runFlags.Args() {386		if arg == "--" {387			rest = runFlags.Args()[i+1:]388			break389		}390		if !strings.HasSuffix(arg, ".go") {391			rest = runFlags.Args()[i:]392			break393		}394		gofiles = append(gofiles, arg)395	}396	return gofiles, rest397}398func shellGo(tmpDir string, goArgs, packages []string) {399	shell(tmpDir, "go", append(goArgs, packages...)...)400}401func shell(gopath, command string, args ...string) {402	cmd := exec.Command(command, args...)403	cmd.Stdout = os.Stdout404	cmd.Stdin = os.Stdin405	cmd.Stderr = os.Stderr406	if gopath != "" {407		setGopath(cmd, gopath)408	}409	err := cmd.Run()410	switch err.(type) {411	case nil:412	case *exec.ExitError:413		exit(1)414	default:415		log.Fatal(err)416	}417}418func setGopath(cmd *exec.Cmd, gopath string) {419	cmd.Env = os.Environ()420	sawGopath := false421	for i := range cmd.Env {422		keyVal := strings.SplitN(cmd.Env[i], "=", 2)423		if keyVal[0] == "GOPATH" {424			cmd.Env[i] = "GOPATH=" + gopath + string(filepath.ListSeparator) + keyVal[1]425		}426	}427	if !sawGopath {428		cmd.Env = append(cmd.Env, "GOPATH="+gopath)429	}430}431func getwd() string {432	cwd, err := os.Getwd()433	if err != nil {434		logFatal("godebug needs to know the current working directory, but failed to determine it:", err)435	}436	return cwd437}438func abs(s string) string {439	res, err := filepath.Abs(s)440	if err != nil {441		logFatal("failed to make output path absolute")442	}443	return res444}445func mapPkgsToTmpDir(pkgs []string) []string {446	result := make([]string, len(pkgs))447	cwd := getwd()448	for i, pkg := range pkgs {449		result[i], _ = findUnderGopath(cwd, pkg)450	}451	return result452}453func findUnderGopath(cwd, pkg string) (string, string) {454	found, err := build.Import(pkg, cwd, build.FindOnly)455	if err != nil {456		logFatalf("Failed to find package %q in findUnderGopath. This is probably a bug -- please report it at https://github.com/mailgun/godebug/issues/new. Thanks!", pkg)457	}458	if found.SrcRoot == "" || found.ImportPath == "" {459		logFatalf("Looks like package %q is not in a GOPATH workspace. godebug doesn't support it right now, but if you open a ticket at https://github.com/mailgun/godebug/issues/new we'll fix it soon. Thanks!", pkg)460	}461	return found.ImportPath, found.Dir462}463func mapToTmpDir(tmpDir string, gofiles []string) []string {464	result := make([]string, len(gofiles))465	for i := range gofiles {466		result[i] = filepath.Join(tmpDir, filepath.Base(gofiles[i]))467	}468	return result469}470func makeTmpDir() (dirname string) {471	tmp, err := ioutil.TempDir("", "godebug")472	if err != nil {473		logFatal("Failed to create temporary directory:", err)474	}475	return tmp476}477func removeDir(dir string) {478	if err := os.RemoveAll(dir); err != nil {479		log.Print("Failed to clean up temporary directory:", err)480	}481}482func doOutput(args []string) {483	exitIfErr(outputFlags.Parse(args))484	var conf loader.Config485	rest, err := conf.FromArgs(outputFlags.Args(), true)486	if len(rest) > 0 {487		fmt.Fprintf(os.Stderr, "Unrecognized arguments:\n%v\n\n", strings.Join(rest, "\n"))488	}489	if err != nil {490		fmt.Fprintf(os.Stderr, "Error identifying packages: %v\n\n", err)491	}492	if len(rest) > 0 || err != nil {493		usage()494	}495	conf.SourceImports = true496	prog, err := conf.Load()497	if err != nil {498		fmt.Fprintf(os.Stderr, "Error loading packages: %v\n\n", err)499		usage()500	}501	gen.Generate(prog, ioutil.ReadFile, func(importPath, filename string) io.WriteCloser {502		if *w {503			return createFileHook(filename, "")504		}505		return nopCloser{os.Stdout}506	})507}508func parseBuildArguments(args []string) ([]string, bool) {509	if len(args) == 0 {510		return []string{"."}, true511	}512	if len(args) == 1 && !strings.HasSuffix(args[0], ".go") {513		return args, true514	}515	for _, a := range args {516		if !strings.HasSuffix(a, ".go") {517			logFatal("you can only build a set of files or a single package")518		}519	}520	return args, false521}522func isFlag(arg, name string) bool {523	return arg == name || strings.HasPrefix(arg, name+"=")524}525func parseTestArguments(args []string) (packages, otherFlags []string) {526	// format: [-godebugwork] [-instrument pkgs...] [-o=...] [-c] [packages] [testFlags]527	// Find first unrecognized flag.528	sep := len(args)529	for i, arg := range args {530		if strings.HasPrefix(arg, "--") {531			arg = arg[1:]532		}533		if strings.HasPrefix(arg, "-") &&534			!isFlag(arg, "-instrument") &&535			!isFlag(arg, "-godebugwork") &&536			!isFlag(arg, "-tags") &&537			!isFlag(arg, "-o") &&538			!isFlag(arg, "-c") {539			sep = i540			break541		}542	}543	exitIfErr(testFlags.Parse(args[:sep]))544	return testFlags.Args(), args[sep:]545}546var (547	// For communicating with tests.548	logCreatedFiles bool549	logFileEnvVar   = "GODEBUG_LOG_CREATED_FILES"550	logFilePrefix   = "godebug created file: "551)552func init() {553	// This is only intended for tests, and so is not documented anywhere.554	if v := os.Getenv(logFileEnvVar); v != "" {555		logCreatedFiles, _ = strconv.ParseBool(v)556	}557}558// createFileHook is intended to capture all calls to os.Create.559// When we run under test, the tests can check if we are creating560// all and only the files we expect to.561func createFileHook(filename, tmpDir string) *os.File {562	if logCreatedFiles {563		if strings.HasPrefix(filename, tmpDir) {564			log.Println(logFilePrefix + "$TMP" + filename[len(tmpDir):])565		} else {566			log.Println(logFilePrefix + filename)567		}568	}569	file, err := os.Create(filename)570	exitIfErr(err)571	return file572}573func getStdLibPkgs() map[string]bool {574	var (575		pkgs   = make(map[string]bool)576		cmd    = exec.Command("go", "list", "std")577		stdout = bytes.NewBuffer(nil)578		stderr = bytes.NewBuffer(nil)579	)580	cmd.Stdout = stdout581	cmd.Stderr = stderr582	if err := cmd.Run(); err != nil {583		fmt.Fprintf(os.Stderr, "Failed to identify standard library packages. godebug should still work, but instrumentation might take longer.\nHere's the error from running 'go list std':\n%s\n", stderr.Bytes())584	}585	b := bytes.TrimSpace(stdout.Bytes())586	for _, pkg := range bytes.Split(b, []byte{'\n'}) {587		pkgs[string(pkg)] = true588	}589	return pkgs590}591type nopCloser struct {592	io.Writer593}594func (nopCloser) Close() error {595	return nil596}597func exitIfErr(err error) {598	if err != nil {599		logFatal(err)600	}601}602func logFatal(v ...interface{}) {603	atexit.CallExitFuncs()604	log.Fatal(v...)605}606func logFatalf(format string, v ...interface{}) {607	atexit.CallExitFuncs()608	log.Fatalf(format, v...)609}610func exit(n int) {611	atexit.CallExitFuncs()612	os.Exit(n)613}...

my-command.go

Source:my-command.go

1package main2import (3	"flag"4	"fmt"5	"os"6)7func testArgs() {8	argsWithProg := os.Args9	argsWithoutProg := os.Args[1:]10	arg := os.Args[3]11	fmt.Println(argsWithProg)12	fmt.Println(argsWithoutProg)13	fmt.Println(arg)14}15func testFlags() {16	wordPtr := flag.String("word", "fou", "a string")17	var svar string18	flag.StringVar(&svar, "svar", "bar", "a string var")19	flag.Parse()20	fmt.Println("word:", *wordPtr)21	fmt.Println("svar:", svar)22}23func testEnv() {24	os.Setenv("boo", "you")25	fmt.Println(os.Getenv("boo"))26	fmt.Println(os.Getenv("bar"))27	for _, e := range os.Environ() {28		fmt.Println(e)29	}30}31func main() {32	//testArgs()33	//testFlags()34	testEnv()35}...

TestFlags

Using AI Code Generation

1import (2func main() {3    var name = flag.String("name", "everyone", "The greeting object.")4    flag.Parse()5    fmt.Printf("Hello, %s!6}7        The greeting object. (default "everyone")

TestFlags

Using AI Code Generation

1import (2func main() {3	prog.TestFlags()4}5import (6func TestFlags() {7	flag.StringVar(&svar, "svar", "bar", "a string var")8	flag.IntVar(&nvar, "nvar", 123, "a int var")9	flag.BoolVar(&bvar, "bvar", false, "a bool var")10	flag.Parse()11	fmt.Println("svar:", svar)12	fmt.Println("nvar:", nvar)13	fmt.Println("bvar:", bvar)14	fmt.Println("tail:", flag.Args())15}16import (17func TestFlags(t *testing.T) {18	flag.Set("svar", "foo")19	flag.Set("nvar", "1234")20	flag.Set("bvar", "true")21	flag.Set("tail", "one")22	flag.Set("tail", "two")23	flag.Parse()24	TestFlags()25}

TestFlags

Using AI Code Generation

1func main() {2    p := prog.New()3    p.TestFlags()4}5import (6type Prog struct {7}8func New() *Prog {9    return &Prog{10    }11}12func (p *Prog) TestFlags() {13    var (14    flag.StringVar(&name, "name", "", "Name of program")15    flag.StringVar(&version, "version", "", "Version of program")16    flag.Parse()17    if name != "" {18    }19    if version != "" {20    }21    fmt.Println("Name:", p.name)22    fmt.Println("Version:", p.version)23}

TestFlags

Using AI Code Generation

1import (2func main() {3	flag.Parse()4	fmt.Println(prog.TestFlags(flag.Args()))5}6import (7func TestFlags(args []string) string {8	return fmt.Sprintf("TestFlags: %v", args)9}10import (11func TestTestFlags(t *testing.T) {12	args := []string{"a", "b", "c"}13	if TestFlags(args) != fmt.Sprintf("TestFlags: %v", args) {14		t.Error("TestFlags failed")15	}16}17import (18func TestMain(m *testing.M) {19	flag.Parse()20	fmt.Println("TestMain")21	m.Run()22}23import (24func TestTestFlags(t *testing.T) {25	args := []string{"a", "b", "c"}26	if TestFlags(args) != fmt.Sprintf("TestFlags: %v", args) {27		t.Error("TestFlags failed")28	}29}30import (31func TestMain(m *testing.M) {32	flag.Parse()33	fmt.Println("TestMain")34	m.Run()35}36import (37func TestTestFlags(t *testing.T) {38	args := []string{"a", "b", "c"}39	if TestFlags(args) != fmt.Sprintf("TestFlags: %v", args) {40		t.Error("TestFlags failed")41	}42}43import (44func TestMain(m *testing.M) {

TestFlags

Using AI Code Generation

1import (2func main() {3	fs := flag.NewFlagSet("test", flag.ExitOnError)4	fs.String("name", "default", "help message")5	fs.Parse(os.Args[1:])6	fmt.Println(fs)7}8&{map[name:{name string foo help message}] 0xc00003c0c0 0xc00003c0c0}9import (10func main() {11	fs := flag.NewFlagSet("test", flag.ExitOnError)12	fs.String("name", "default", "help message")13	fs.Parse(os.Args[1:])14	fs.PrintDefaults()15}16    	help message (default "default")17import (18func main() {19	fs := flag.NewFlagSet("test", flag.ExitOnError)20	fs.String("name", "default", "help message")21	fs.Parse(os.Args[1:])22	fs.Set("name", "foo")

TestFlags

Using AI Code Generation

1import (2func main() {3    flag.Parse()4    fmt.Println("command line arguments are:", flag.Args())5    fmt.Println("number of command line arguments are:", flag.NArg())6    fmt.Println("command line flags are:", flag.Args())7    fmt.Println("number of command line flags are:", flag.NFlag())8    fmt.Println("flags are:", flag.Args())9    fmt.Println("number of flags are:", flag.NFlag())10}

TestFlags

Using AI Code Generation

1func main() {2    p := prog.NewProgram()3    p.TestFlags()4}5import "flag"6We have defined a flag variable named testFlag using the flag package. The testFlag variable is of type string and it is defined as a flag variable. The flag variable is defined using the flag.String() method. The first argument to the flag.String() method is the name of the flag variable and the second argument is the value of the flag variable. The third argument is the description of the flag variable. The flag.String() method returns a pointer to the flag variable. We have used the flag.Parse() method to parse the command line arguments. The flag.Parse() method will

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