feat: method for fetching latest commit from gittest server (#636)

Co-authored-by: Aris Tzoumas <atzoumas@rudderstack.com>

go.mod

@@ -1,6 +1,6 @@
 module github.com/rudderlabs/rudder-go-kit
 
-go 1.22.5
+go 1.22.7
 
 replace github.com/gocql/gocql => github.com/scylladb/gocql v1.14.2
 

testhelper/gittest/gittest.go

@@ -109,6 +109,14 @@ func (s *Server) GetServerCA() []byte {
 	return getServerCA(s.Server)
 }
 
+func (s *Server) GetLatestCommitHash(t testing.TB, branch string) string {
+	cmd := exec.Command("git", "ls-remote", s.URL, fmt.Sprintf("refs/heads/%s", branch))
+	out, err := cmd.Output()
+	require.NoError(t, err, "should be able to run the ls-remote command")
+	commitHash := strings.Split(string(out), "\t")[0]
+	return commitHash
+}
+
 func getServerCA(server *httptest.Server) []byte {
 	return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: server.TLS.Certificates[0].Certificate[0]})
 }

testhelper/gittest/gittest_test.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -57,6 +58,13 @@ func TestGitServer(t *testing.T) {
 
 		out, err = execCmd("git", "-C", tempDir, "push", "origin", "v1.0.0")
 		require.NoErrorf(t, err, "should be able to push the tag: %s", out)
+
+		out, err = execCmd("git", "-C", tempDir, "rev-parse", "HEAD")
+		require.NoError(t, err, "should be able to get the HEAD commit")
+		require.NotEmpty(t, out, "HEAD commit should not be empty")
+
+		latestCommit := s.GetLatestCommitHash(t, "develop")
+		require.Equal(t, strings.TrimSpace(out), latestCommit, "HEAD commit should match the latest commit")
 	})
 
 	t.Run("https", func(t *testing.T) {