1 files changed, 23 insertions, 0 deletions
diff --git a/internal/testgit/repo_commit_tree.go b/internal/testgit/repo_commit_tree.go
new file mode 100644
index 00000000..b5f2f587
--- /dev/null
+++ b/internal/testgit/repo_commit_tree.go
@@ -0,0 +1,23 @@
+package testgit
+
+import (
+	"testing"
+
+	"codeberg.org/lindenii/furgit/oid"
+)
+
+// CommitTree creates a commit from a tree and message, optionally with parents.
+func (repo *TestRepo) CommitTree(tb testing.TB, tree oid.ObjectID, message string, parents ...oid.ObjectID) oid.ObjectID {
+	tb.Helper()
+	args := []string{"commit-tree", tree.String()}
+	for _, p := range parents {
+		args = append(args, "-p", p.String())
+	}
+	args = append(args, "-m", message)
+	hex := repo.Run(tb, args...)
+	id, err := oid.ParseHex(repo.algo, hex)
+	if err != nil {
+		tb.Fatalf("parse commit-tree output %q: %v", hex, err)
+	}
+	return id
+}