add dgrep test

1 files changed, 61 insertions, 0 deletions

diff --git a/integrationtests/commons.go b/integrationtests/commons.go
new file mode 100644
index 0000000..6422949
--- /dev/null
+++ b/integrationtests/commons.go
@@ -0,0 +1,61 @@
+package integrationtests
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func runCommand(t *testing.T, cmd string, args []string, stdoutFile string) error {
+	if _, err := os.Stat(cmd); err != nil {
+		return fmt.Errorf("No such binary %s, please compile first (%v)", cmd, err)
+	}
+
+	t.Log("Executing command:", cmd, strings.Join(args, " "))
+	bytes, err := exec.Command(cmd, args...).Output()
+	if err != nil {
+		return err
+	}
+
+	t.Log("Writing stdout to file", stdoutFile)
+	fd, err := os.Create(stdoutFile)
+	if err != nil {
+		return err
+	}
+	fd.Write(bytes)
+	fd.Close()
+
+	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
+}