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package integrationtests
import (
"bufio"
"context"
"crypto/sha256"
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
"syscall"
"testing"
)
func runCommand(t *testing.T, cmd string, args []string, stdoutFile string) (int, error) {
return runCommandContext(context.TODO(), t, cmd, args, stdoutFile)
}
func runCommandContext(ctx context.Context, t *testing.T, cmd string, args []string,
stdoutFile string) (int, error) {
if _, err := os.Stat(cmd); err != nil {
return -1, fmt.Errorf("No such binary %s, please compile first (%v)", cmd, err)
}
t.Log("Running command:", cmd, strings.Join(args, " "))
bytes, cmdErr := exec.CommandContext(ctx, cmd, args...).Output()
t.Log("Writing stdout to file", stdoutFile)
fd, err := os.Create(stdoutFile)
if err != nil {
return -1, err
}
defer fd.Close()
fd.Write(bytes)
return exitCodeFromError(cmdErr), err
}
func exitCodeFromError(err error) int {
if err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
ws := exitError.Sys().(syscall.WaitStatus)
return ws.ExitStatus()
}
}
return 0
}
// Checks whether both files have the same lines (order doesn't matter)
func compareFilesContents(t *testing.T, fileA, fileB string) error {
mapFile := func(file string) (map[string]int, error) {
t.Log("Reading", file)
contents := make(map[string]int)
fd, err := os.Open(file)
if err != nil {
return contents, err
}
defer fd.Close()
scanner := bufio.NewScanner(fd)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
line := scanner.Text()
count, _ := contents[line]
contents[line] = count + 1
}
return contents, nil
}
compareMaps := func(a, b map[string]int) error {
for line, countA := range a {
countB, ok := b[line]
if !ok {
return fmt.Errorf("Files differ, line '%s' is missing in one of them", line)
}
if countA != countB {
return fmt.Errorf("Files differ, count of line '%s' is %d in one but %d in another",
line, countA, countB)
}
}
return nil
}
a, err := mapFile(fileA)
if err != nil {
return err
}
b, err := mapFile(fileB)
if err != nil {
return err
}
// The mapreduce result can be in a different order each time (Golang maps are not sorted).
t.Log(fmt.Sprintf("Checking whether %s has same lines as file %s (ignoring line order)",
fileA, fileB))
if err := compareMaps(a, b); err != nil {
return err
}
t.Log(fmt.Sprintf("Checking whether %s has same lines as file %s (ignoring line order)",
fileB, fileA))
if err := compareMaps(b, a); err != nil {
return err
}
return nil
}
func compareFiles(t *testing.T, fileA, fileB string) error {
t.Log("Comparing files", fileA, fileB)
shaFileA := shaOfFile(t, fileA)
shaFileB := shaOfFile(t, fileB)
if shaFileA != shaFileB {
t.Errorf("Expected SHA %s but got %s", shaFileA, shaFileB)
if bytes, err := exec.Command("diff", "-u", fileA, fileB).Output(); err != nil {
return fmt.Errorf(string(bytes))
}
}
return nil
}
func shaOfFile(t *testing.T, file string) string {
bytes, err := ioutil.ReadFile(file)
if err != nil {
t.Error(err)
}
hasher := sha256.New()
hasher.Write(bytes)
sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil))
t.Log("SHA", file, sha)
return sha
}
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