feat: GitClient shell-out with temp clone + integration test

Co-Authored-By: Claude

src/git.test.ts

@@ -0,0 +1,52 @@
+import { afterAll, beforeAll, expect, test } from "vitest";
+import { execFileSync } from "node:child_process";
+import { mkdtempSync, mkdirSync, rmSync, readFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { ChildProcessGitClient } from "./git";
+
+let root: string, bare: string, base: string;
+
+beforeAll(() => {
+  root = mkdtempSync(join(tmpdir(), "jp-git-"));
+  bare = join(root, "remote.git");
+  base = join(root, "work");
+  mkdirSync(bare); mkdirSync(base);
+  execFileSync("git", ["init", "--bare", "-b", "main", bare]);
+  // seed an initial commit so the branch exists
+  const seed = join(root, "seed");
+  mkdirSync(seed);
+  execFileSync("git", ["init", "-b", "main", seed]);
+  execFileSync("git", ["-C", seed, "config", "user.email", "t@t"]);
+  execFileSync("git", ["-C", seed, "config", "user.name", "t"]);
+  execFileSync("git", ["-C", seed, "commit", "--allow-empty", "-m", "init"]);
+  execFileSync("git", ["-C", seed, "remote", "add", "origin", bare]);
+  execFileSync("git", ["-C", seed, "push", "origin", "main"]);
+});
+
+afterAll(() => rmSync(root, { recursive: true, force: true }));
+
+test("clone, write, commit, push lands files in the remote", async () => {
+  const client = new ChildProcessGitClient({ baseDir: base });
+  await client.syncClone({ url: bare, branch: "main" });
+  await client.writeFiles([
+    { repoPath: "_posts/2026-06-19-hi.md", data: "---\nlayout: post\n---\n\nHi\n" },
+    { repoPath: "assets/img/hi.png", data: Buffer.from([1, 2, 3]) },
+  ]);
+  await client.commitAndPush({ message: "Publish: Hi", branch: "main", authorName: "t", authorEmail: "t@t" });
+
+  const verify = join(root, "verify");
+  execFileSync("git", ["clone", bare, verify]);
+  expect(readFileSync(join(verify, "_posts/2026-06-19-hi.md"), "utf8")).toContain("Hi");
+  expect(Array.from(readFileSync(join(verify, "assets/img/hi.png")))).toEqual([1, 2, 3]);
+});
+
+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" });
+  const verify = join(root, "verify2");
+  execFileSync("git", ["clone", bare, verify]);
+  expect(readFileSync(join(verify, "_posts/second.md"), "utf8")).toBe("x");
+});