Adding testtool - the submission tester.

README.md

@@ -104,3 +104,5 @@ go test -tags solution,private ./...
 ## 4. Скопировать testdata из приватного репозитория.
 go test -tags private ./...
 ```
+
+Для проверки submission'ов есть testtool (см. docs/testtool.md).

docs/testtool.md

@@ -0,0 +1,26 @@
+# testtool - проверка решений
+
+testtool - cobra-based cli. У всех комманд есть help.
+Использование можно начать с такого:
+```
+go run ./tools/testtool/main.go --help
+```
+
+При тестирование посылки выполняются следующие шаги:
+0. Создаётся временная директория, в которой будут собраны необходимые файлы.
+1. Копируются файлы пакета из посылки.
+2. Копируются все файлы тестов из приватного репозитория.
+3. Копируются !change файлы из приватного репозитория.
+4. Копируются testdata из приватного репозитория.
+5. Копируются go.mod и go.sum
+6. Запускается go test -mod=readonly -tags private ./...
+
+## Разработчикам
+
+Запуск тестов:
+```
+go test -v ./tools/testtool/...
+```
+
+В tools/testtool/testdata/submissions находятся sample проекты, на которых запускаются тесты.
+В поддиректории correct - тесты с верным решением студента, в incorrect - c неверным.

go.mod

@@ -1,3 +1,9 @@
 module gitlab.com/slon/shad-go
 
 go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

go.sum

@@ -0,0 +1,54 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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+github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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tools/testtool/commands/root.go

@@ -0,0 +1,24 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// rootCmd represents the base command when called without any subcommands.
+var rootCmd = &cobra.Command{
+	Use:              "testtool",
+	Short:            "test submissions",
+	TraverseChildren: true,
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}

tools/testtool/commands/test_submission.go

@@ -0,0 +1,258 @@
+package commands
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"golang.org/x/tools/go/packages"
+)
+
+const (
+	problemFlag     = "problem"
+	studentRepoFlag = "student-repo"
+	privateRepoFlag = "private-repo"
+
+	testdataDir = "testdata"
+)
+
+var testSubmissionCmd = &cobra.Command{
+	Use:     "test",
+	Aliases: []string{"check", "test-submission", "check-submission"},
+	Short:   "test submission",
+	Long:    `run solution on private and private tests`,
+	Run: func(cmd *cobra.Command, args []string) {
+		problem, err := cmd.Flags().GetString(problemFlag)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		studentRepo := mustParseDirFlag(studentRepoFlag, cmd)
+		if !problemDirExists(studentRepo, problem) {
+			log.Fatalf("%s does not have %s directory", studentRepo, problem)
+		}
+
+		privateRepo := mustParseDirFlag(privateRepoFlag, cmd)
+		if !problemDirExists(privateRepo, problem) {
+			log.Fatalf("%s does not have %s directory", privateRepo, problem)
+		}
+
+		testSubmission(studentRepo, privateRepo, problem)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(testSubmissionCmd)
+
+	testSubmissionCmd.Flags().String(problemFlag, "", "problem directory name (required)")
+	_ = testSubmissionCmd.MarkFlagRequired(problemFlag)
+
+	testSubmissionCmd.Flags().String(studentRepoFlag, ".", "path to student repo root")
+	testSubmissionCmd.Flags().String(privateRepoFlag, ".", "path to shad-go-private repo root")
+}
+
+// mustParseDirFlag parses string directory flag with given name.
+//
+// Exits on any error.
+func mustParseDirFlag(name string, cmd *cobra.Command) string {
+	dir, err := cmd.Flags().GetString(name)
+	if err != nil {
+		log.Fatal(err)
+	}
+	dir, err = filepath.Abs(dir)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return dir
+}
+
+// Check that repo dir contains problem subdir.
+func problemDirExists(repo, problem string) bool {
+	info, err := os.Stat(path.Join(repo, problem))
+	if err != nil {
+		return false
+	}
+	return info.IsDir()
+}
+
+func testSubmission(studentRepo, privateRepo, problem string) {
+	// Create temp directory to store all files required to test the solution.
+	tmpDir, err := ioutil.TempDir("/tmp", problem+"-")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer func() { _ = os.RemoveAll(tmpDir) }()
+	log.Printf("testing submission in %s", tmpDir)
+
+	// Path to student's problem folder.
+	studentProblem := path.Join(studentRepo, problem)
+	// Path to private problem folder.
+	privateProblem := path.Join(privateRepo, problem)
+
+	// Copy submission files to temp temp dir.
+	log.Printf("copying student solution")
+	copyContents(studentProblem, tmpDir)
+
+	// Copy tests from private repo to temp dir.
+	log.Printf("copying tests")
+	tests := listTestFiles(privateProblem)
+	copyFiles(privateProblem, relPaths(privateProblem, tests), tmpDir)
+
+	// Copy !change files from private repo to temp dir.
+	log.Printf("copying !change files")
+	protected := listProtectedFiles(privateProblem)
+	copyFiles(privateProblem, relPaths(privateProblem, protected), tmpDir)
+
+	// Copy testdata directory from private repo to temp dir.
+	log.Printf("copying testdata directory")
+	copyDir(path.Join(privateProblem, testdataDir), tmpDir)
+
+	// Copy go.mod and go.sum from private repo to temp dir.
+	log.Printf("copying go.mod and go.sum")
+	copyFiles(privateRepo, []string{"go.mod", "go.sum"}, tmpDir)
+
+	// Run tests.
+	log.Printf("running tests")
+	runTests(tmpDir)
+}
+
+// copyDir recursively copies src directory to dst.
+func copyDir(src, dst string) {
+	_, err := os.Stat(src)
+	if os.IsNotExist(err) {
+		return
+	}
+
+	cmd := exec.Command("rsync", "-r", src, dst)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	if err := cmd.Start(); err != nil {
+		log.Fatalf("error starting rsync command: %s", err)
+	}
+
+	if err := cmd.Wait(); err != nil {
+		log.Fatalf("rsync command failed: %s", err)
+	}
+}
+
+// copyDir recursively copies src contents to dst.
+func copyContents(src, dst string) {
+	copyDir(src+"/", dst)
+}
+
+// List all _test.go files in given directory including the ones with "private" build tag.
+//
+// Returns absolute paths.
+func listTestFiles(problemDir string) []string {
+	files := getPackageFiles(problemDir, []string{"-tags", "private"})
+	var tests []string
+	for f := range files {
+		if strings.HasSuffix(f, "_test.go") {
+			tests = append(tests, f)
+		}
+	}
+	return tests
+}
+
+// List all .go source files in given directory protected by "!change" build tag.
+//
+// Returns absolute paths.
+func listProtectedFiles(problemDir string) []string {
+	allFiles := getPackageFiles(problemDir, nil)
+	allFilesWithoutProtected := getPackageFiles(problemDir, []string{"-tags", "change"})
+
+	var protectedFiles []string
+	for f := range allFiles {
+		if _, ok := allFilesWithoutProtected[f]; !ok {
+			protectedFiles = append(protectedFiles, f)
+		}
+	}
+
+	return protectedFiles
+}
+
+// Copy files preserving directory structure relative to baseDir.
+//
+// Existing files get replaced.
+func copyFiles(baseDir string, relPaths []string, dst string) {
+	for _, p := range relPaths {
+		cmd := exec.Command("rsync", "-rR", p, dst)
+		cmd.Dir = baseDir
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+
+		if err := cmd.Start(); err != nil {
+			log.Fatalf("error starting file copying: %s", err)
+		}
+
+		if err := cmd.Wait(); err != nil {
+			log.Fatalf("file copying failed: %s", err)
+		}
+	}
+}
+
+// Run all test in directory with race detector.
+func runTests(testDir string) {
+	cmd := exec.Command("go", "test", "-v", "-mod", "readonly", "-tags", "private", "-race", "./...")
+	cmd.Dir = testDir
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	if err := cmd.Start(); err != nil {
+		log.Fatalf("error starting go test command: %s", err)
+	}
+
+	if err := cmd.Wait(); err != nil {
+		log.Fatalf("go test command failed: %s", err)
+	}
+}
+
+// Get absolute paths for all files in rootPackage and it's subpackages
+// including tests and non-go files.
+func getPackageFiles(rootPackage string, buildFlags []string) map[string]struct{} {
+	cfg := &packages.Config{
+		Dir:        rootPackage,
+		Mode:       packages.NeedFiles,
+		BuildFlags: buildFlags,
+		Tests:      true,
+	}
+	pkgs, err := packages.Load(cfg, "./...")
+	if err != nil {
+		log.Fatalf("unable to load packages %s: %s", rootPackage, err)
+	}
+
+	if packages.PrintErrors(pkgs) > 0 {
+		os.Exit(1)
+	}
+
+	files := make(map[string]struct{})
+	for _, p := range pkgs {
+		for _, f := range p.GoFiles {
+			files[f] = struct{}{}
+		}
+		for _, f := range p.OtherFiles {
+			files[f] = struct{}{}
+		}
+	}
+
+	return files
+}
+
+// Convert paths to relative (to the baseDir) ones.
+func relPaths(baseDir string, paths []string) []string {
+	ret := make([]string, len(paths))
+	for i, p := range paths {
+		relPath, err := filepath.Rel(baseDir, p)
+		if err != nil {
+			log.Fatal(err)
+		}
+		ret[i] = relPath
+	}
+	return ret
+}

tools/testtool/commands/test_submission_test.go

@@ -0,0 +1,77 @@
+package commands
+
+import (
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// List directories in given directory.
+func listDirs(dir string) ([]string, error) {
+	files, err := ioutil.ReadDir(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	var dirs []string
+	for _, f := range files {
+		if f.IsDir() {
+			dirs = append(dirs, path.Join(dir, f.Name()))
+		}
+	}
+
+	return dirs, nil
+}
+
+func Test_testSubmission_correct(t *testing.T) {
+	testDirs, err := listDirs("../testdata/submissions/correct")
+	require.Nil(t, err)
+
+	for _, dir := range testDirs {
+		dir, err := filepath.Abs(dir)
+		require.Nil(t, err)
+		problem := path.Base(dir)
+		t.Run(problem, func(t *testing.T) {
+			studentRepo := path.Join(dir, "student")
+			privateRepo := path.Join(dir, "private")
+			testSubmission(studentRepo, privateRepo, problem)
+		})
+	}
+}
+
+func Test_testSubmission_incorrect(t *testing.T) {
+	testDirs, err := listDirs("../testdata/submissions/incorrect")
+	require.Nil(t, err)
+
+	for _, dir := range testDirs {
+		dir, err := filepath.Abs(dir)
+		require.Nil(t, err)
+
+		problem := path.Base(dir)
+		t.Run(problem, func(t *testing.T) {
+			if os.Getenv("BE_CRASHER") == "1" {
+				studentRepo := path.Join(dir, "student")
+				privateRepo := path.Join(dir, "private")
+				testSubmission(studentRepo, privateRepo, problem)
+				return
+			}
+
+			cmd := exec.Command(os.Args[0], "-test.run=Test_testSubmission_incorrect/"+problem)
+			cmd.Env = append(os.Environ(), "BE_CRASHER=1")
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+
+			err := cmd.Run()
+			if e, ok := err.(*exec.ExitError); ok && !e.Success() {
+				return
+			}
+
+			t.Fatalf("process ran with err %v, want exit status != 0", err)
+		})
+	}
+}

tools/testtool/main.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"gitlab.com/slon/shad-go/tools/testtool/commands"
+)
+
+func main() {
+	commands.Execute()
+}

tools/testtool/testdata/submissions/correct/sum/private/go.mod

@@ -0,0 +1,9 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

tools/testtool/testdata/submissions/correct/sum/private/go.sum

@@ -0,0 +1,53 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
+github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
+github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
+github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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tools/testtool/testdata/submissions/correct/sum/private/sum/sum.go

@@ -0,0 +1,7 @@
+// +build !solution
+
+package sum
+
+func Sum(a, b int64) int64 {
+	return 0
+}

tools/testtool/testdata/submissions/correct/sum/private/sum/sum_private_test.go

@@ -0,0 +1,45 @@
+// + build private
+
+package sum
+
+import (
+	"encoding/csv"
+	"os"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// Read tests from csv file.
+func readTestCases(filename string) ([]*testCase, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	records, err := csv.NewReader(f).ReadAll()
+	if err != nil {
+		return nil, err
+	}
+
+	var tests []*testCase
+	for _, r := range records {
+		a, _ := strconv.ParseInt(r[0], 10, 64)
+		b, _ := strconv.ParseInt(r[1], 10, 64)
+		sum, _ := strconv.ParseInt(r[2], 10, 64)
+		tests = append(tests, &testCase{a: a, b: b, sum: sum})
+	}
+
+	return tests, nil
+}
+
+func TestSumPrivate(t *testing.T) {
+	tests, err := readTestCases("./testdata/tests.csv")
+	require.Nil(t, err)
+
+	for _, tc := range tests {
+		s := Sum(tc.a, tc.b)
+		require.Equal(t, tc.sum, s, "%d + %d == %d != %d", tc.a, tc.b, s, tc.sum)
+	}
+}

tools/testtool/testdata/submissions/correct/sum/private/sum/sum_solution.go

@@ -0,0 +1,7 @@
+// +build solution
+
+package sum
+
+func Sum(a, b int64) int64 {
+	return a + b
+}

tools/testtool/testdata/submissions/correct/sum/private/sum/sum_test.go

@@ -0,0 +1,22 @@
+package sum
+
+import (
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func TestSum(t *testing.T) {
+	for _, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+	} {
+		if out := Sum(input.a, input.b); out != input.sum {
+			t.Errorf("%d + %d == %d != %d", input.a, input.b, out, input.sum)
+		}
+	}
+}

tools/testtool/testdata/submissions/correct/sum/private/sum/testdata/tests.csv

@@ -0,0 +1,3 @@
+a,b,sum
+0,0,0
+1,-1,0

tools/testtool/testdata/submissions/correct/sum/student/go.mod

@@ -0,0 +1,9 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

tools/testtool/testdata/submissions/correct/sum/student/go.sum

@@ -0,0 +1,53 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

tools/testtool/testdata/submissions/correct/sum/student/sum/sum.go

@@ -0,0 +1,7 @@
+// +build !solution
+
+package sum
+
+func Sum(a, b int64) int64 {
+	return a + b
+}

tools/testtool/testdata/submissions/correct/sum/student/sum/sum_test.go

@@ -0,0 +1,23 @@
+package sum
+
+import (
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func TestSum(t *testing.T) {
+	for _, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+		{a: -1, b: -1, sum: -2},
+	} {
+		if out := Sum(input.a, input.b); out != input.sum {
+			t.Errorf("%d + %d == %d != %d", input.a, input.b, out, input.sum)
+		}
+	}
+}

tools/testtool/testdata/submissions/correct/sum/student/sum/testdata/tests.csv

@@ -0,0 +1,3 @@
+a,b,sum
+0,0,0
+1,-1,0

tools/testtool/testdata/submissions/incorrect/brokentest/description.md

@@ -0,0 +1 @@
+Student solution compiles but does not pass tests.

tools/testtool/testdata/submissions/incorrect/brokentest/private/brokentest/sum.go

@@ -0,0 +1,7 @@
+// +build !solution
+
+package brokentest
+
+func Sum(a, b int64) int64 {
+	return 0
+}

tools/testtool/testdata/submissions/incorrect/brokentest/private/brokentest/sum_private_test.go

@@ -0,0 +1,45 @@
+// +build private
+
+package brokentest
+
+import (
+	"encoding/csv"
+	"os"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// Read tests from csv file.
+func readTestCases(filename string) ([]*testCase, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	records, err := csv.NewReader(f).ReadAll()
+	if err != nil {
+		return nil, err
+	}
+
+	var tests []*testCase
+	for _, r := range records {
+		a, _ := strconv.ParseInt(r[0], 10, 64)
+		b, _ := strconv.ParseInt(r[1], 10, 64)
+		sum, _ := strconv.ParseInt(r[2], 10, 64)
+		tests = append(tests, &testCase{a: a, b: b, sum: sum})
+	}
+
+	return tests, nil
+}
+
+func TestSumPrivate(t *testing.T) {
+	tests, err := readTestCases("./testdata/tests.csv")
+	require.Nil(t, err)
+
+	for _, tc := range tests {
+		s := Sum(tc.a, tc.b)
+		require.Equal(t, tc.sum, s, "%d + %d == %d != %d", tc.a, tc.b, s, tc.sum)
+	}
+}

tools/testtool/testdata/submissions/incorrect/brokentest/private/brokentest/sum_solution.go

@@ -0,0 +1,7 @@
+// +build solution
+
+package brokentest
+
+func Sum(a, b int64) int64 {
+	return a + b
+}

tools/testtool/testdata/submissions/incorrect/brokentest/private/brokentest/sum_test.go

@@ -0,0 +1,22 @@
+package brokentest
+
+import (
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func TestSum(t *testing.T) {
+	for _, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+	} {
+		if out := Sum(input.a, input.b); out != input.sum {
+			t.Errorf("%d + %d == %d != %d", input.a, input.b, out, input.sum)
+		}
+	}
+}

tools/testtool/testdata/submissions/incorrect/brokentest/private/brokentest/testdata/tests.csv

@@ -0,0 +1,3 @@
+a,b,sum
+0,0,0
+1,-1,0

tools/testtool/testdata/submissions/incorrect/brokentest/private/go.mod

@@ -0,0 +1,9 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

tools/testtool/testdata/submissions/incorrect/brokentest/private/go.sum

@@ -0,0 +1,53 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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tools/testtool/testdata/submissions/incorrect/brokentest/student/brokentest/sum.go

@@ -0,0 +1,7 @@
+// +build !solution
+
+package brokentest
+
+func Sum(a, b int64) int64 {
+	return a + 1
+}

tools/testtool/testdata/submissions/incorrect/brokentest/student/brokentest/sum_test.go

@@ -0,0 +1,23 @@
+package brokentest
+
+import (
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func TestSum(t *testing.T) {
+	for _, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+		{a: -1, b: -1, sum: -2},
+	} {
+		if out := Sum(input.a, input.b); out != input.sum {
+			t.Errorf("%d + %d == %d != %d", input.a, input.b, out, input.sum)
+		}
+	}
+}

tools/testtool/testdata/submissions/incorrect/brokentest/student/brokentest/testdata/tests.csv

@@ -0,0 +1,3 @@
+a,b,sum
+0,0,0
+1,-1,0

tools/testtool/testdata/submissions/incorrect/brokentest/student/go.mod

@@ -0,0 +1,9 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

tools/testtool/testdata/submissions/incorrect/brokentest/student/go.sum

@@ -0,0 +1,53 @@
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+golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825 h1:aNQeSIHKi0RWpKA5NO0CqyLjx6Beh5l0LLUEnndEjz0=
+golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

tools/testtool/testdata/submissions/incorrect/newdependency/description.md

@@ -0,0 +1 @@
+Student solution is correct but it introduces new dependency not found in root go.mod.

tools/testtool/testdata/submissions/incorrect/newdependency/private/go.mod

@@ -0,0 +1,9 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+)

tools/testtool/testdata/submissions/incorrect/newdependency/private/go.sum

@@ -0,0 +1,53 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
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+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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tools/testtool/testdata/submissions/incorrect/newdependency/private/newdependency/sum.go

@@ -0,0 +1,7 @@
+// +build !solution
+
+package newdependency
+
+func Sum(a, b int64) int64 {
+	return 0
+}

tools/testtool/testdata/submissions/incorrect/newdependency/private/newdependency/sum_private_test.go

@@ -0,0 +1,45 @@
+// +build private
+
+package newdependency
+
+import (
+	"encoding/csv"
+	"os"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// Read tests from csv file.
+func readTestCases(filename string) ([]*testCase, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	records, err := csv.NewReader(f).ReadAll()
+	if err != nil {
+		return nil, err
+	}
+
+	var tests []*testCase
+	for _, r := range records {
+		a, _ := strconv.ParseInt(r[0], 10, 64)
+		b, _ := strconv.ParseInt(r[1], 10, 64)
+		sum, _ := strconv.ParseInt(r[2], 10, 64)
+		tests = append(tests, &testCase{a: a, b: b, sum: sum})
+	}
+
+	return tests, nil
+}
+
+func TestSumPrivate(t *testing.T) {
+	tests, err := readTestCases("./testdata/tests.csv")
+	require.Nil(t, err)
+
+	for _, tc := range tests {
+		s := Sum(tc.a, tc.b)
+		require.Equal(t, tc.sum, s, "%d + %d == %d != %d", tc.a, tc.b, s, tc.sum)
+	}
+}

tools/testtool/testdata/submissions/incorrect/newdependency/private/newdependency/sum_solution.go

@@ -0,0 +1,7 @@
+// +build solution
+
+package newdependency
+
+func Sum(a, b int64) int64 {
+	return a + b
+}

tools/testtool/testdata/submissions/incorrect/newdependency/private/newdependency/sum_test.go

@@ -0,0 +1,22 @@
+package newdependency
+
+import (
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func TestSum(t *testing.T) {
+	for _, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+	} {
+		if out := Sum(input.a, input.b); out != input.sum {
+			t.Errorf("%d + %d == %d != %d", input.a, input.b, out, input.sum)
+		}
+	}
+}

tools/testtool/testdata/submissions/incorrect/newdependency/private/newdependency/testdata/tests.csv

@@ -0,0 +1,3 @@
+a,b,sum
+0,0,0
+1,-1,0

tools/testtool/testdata/submissions/incorrect/newdependency/student/go.mod

@@ -0,0 +1,10 @@
+module gitlab.com/slon/shad-go
+
+go 1.13
+
+require (
+	github.com/spf13/cobra v0.0.5
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825
+	rsc.io/quote/v3 v3.1.0
+)

tools/testtool/testdata/submissions/incorrect/newdependency/student/go.sum

@@ -0,0 +1,60 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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tools/testtool/testdata/submissions/incorrect/newdependency/student/newdependency/sum.go

@@ -0,0 +1,10 @@
+// +build !solution
+
+package newdependency
+
+import "rsc.io/quote/v3"
+
+func Sum(a, b int64) int64 {
+	quote.HelloV3()
+	return a + b
+}

tools/testtool/testdata/submissions/incorrect/newdependency/student/newdependency/sum_test.go

@@ -0,0 +1,23 @@
+package newdependency
+
+import (
+	"math"
+	"testing"
+)
+
+type testCase struct {
+	a, b, sum int64
+}
+
+func TestSum(t *testing.T) {
+	for _, input := range []testCase{
+		{a: 2, b: 2, sum: 4},
+		{a: 2, b: -2, sum: 0},
+		{a: math.MaxInt64, b: 1, sum: math.MinInt64},
+		{a: -1, b: -1, sum: -2},
+	} {
+		if out := Sum(input.a, input.b); out != input.sum {
+			t.Errorf("%d + %d == %d != %d", input.a, input.b, out, input.sum)
+		}
+	}
+}

tools/testtool/testdata/submissions/incorrect/newdependency/student/newdependency/testdata/tests.csv

@@ -0,0 +1,3 @@
+a,b,sum
+0,0,0
+1,-1,0