diff --git a/src/git.test.ts b/src/git.test.ts
index 7019fa0..48ac13e 100644
--- a/src/git.test.ts
+++ b/src/git.test.ts
@@ -45,7 +45,9 @@ test("second sync resets cleanly (fetch+reset path)", async () => {
   const client = new ChildProcessGitClient({ baseDir: base });
   await client.syncClone({ url: bare, branch: "main" });
   await client.writeFiles([{ repoPath: "_posts/second.md", data: "x" }]);
-  await client.commitAndPush({ message: "second", branch: "main" });
+  // Pass an explicit author so the test does not depend on an ambient git
+  // identity (a bare CI runner has none and `git commit` would fail).
+  await client.commitAndPush({ message: "second", branch: "main", authorName: "t", authorEmail: "t@t" });
   const verify = join(root, "verify2");
   execFileSync("git", ["clone", bare, verify]);
   expect(readFileSync(join(verify, "_posts/second.md"), "utf8")).toBe("x");