git-story: setup Jest test

ts/packages/git-story/jest.config.cjs

@@ -0,0 +1,4 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+module.exports = require("../../jest.config.js");

ts/packages/git-story/package.json

@@ -18,15 +18,20 @@
   "scripts": {
     "build": "npm run tsc",
     "clean": "rimraf --glob dist *.tsbuildinfo *.done.build.log",
+    "jest-esm": "node --no-warnings --experimental-vm-modules ./node_modules/jest/bin/jest.js",
     "prettier": "prettier --check . --ignore-path ../../.prettierignore",
     "prettier:fix": "prettier --write . --ignore-path ../../.prettierignore",
+    "test": "npm run test:local",
+    "test:local": "pnpm run jest-esm --testPathPattern=\".*[.]spec[.]js\"",
     "tsc": "tsc -b"
   },
   "dependencies": {
     "commander": "^12.1.0"
   },
   "devDependencies": {
+    "@types/jest": "^29.5.7",
     "@types/node": "^20.10.0",
+    "jest": "^29.7.0",
     "rimraf": "^6.0.1",
     "typescript": "~5.4.5"
   }

ts/packages/git-story/test/hooks.spec.ts

@@ -0,0 +1,56 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+import { spawnSync } from "node:child_process";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const CLI = path.resolve(
+    path.dirname(fileURLToPath(import.meta.url)),
+    "../cli.js",
+);
+
+// End to end: `init` writes the hook, then a real `git commit` runs it
+// through git's own sh (Git Bash on Windows). An extensionless sh shim puts
+// `git-story` on PATH, same as `npm link` does on every OS.
+test("pre-commit hook forwards args and stdin to git-story", () => {
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "git-story-"));
+    const bin = path.join(dir, "bin");
+    const repo = path.join(dir, "repo");
+    fs.mkdirSync(bin);
+    const cli = CLI.replace(/\\/g, "/");
+    fs.writeFileSync(
+        path.join(bin, "git-story"),
+        `#!/bin/sh\nexec node "${cli}" "$@"\n`,
+        { mode: 0o755 },
+    );
+    const env = {
+        ...process.env,
+        PATH: `${bin}${path.delimiter}${process.env.PATH}`,
+        GIT_CONFIG_GLOBAL: path.join(dir, "gitconfig"),
+        GIT_CONFIG_NOSYSTEM: "1",
+    };
+    // Returns stdout + stderr; git sends hook output to stderr.
+    const run = (cmd: string, args: string[], input = "") => {
+        const r = spawnSync(cmd, args, {
+            cwd: repo,
+            env,
+            input,
+            encoding: "utf8",
+        });
+        expect(r.status).toBe(0);
+        return r.stdout + r.stderr;
+    };
+    fs.mkdirSync(repo);
+    run("git", ["init", "-q"]);
+    run("node", [CLI, "init"]);
+    const commit = ["-c", "user.name=t", "-c", "user.email=t@t"];
+    const out = run("git", [...commit, "commit", "--allow-empty", "-m", "x"]);
+    expect(out).toContain('git-story pre-commit: args=[] stdin=""');
+
+    const hook = path.join(repo, ".git/hooks/pre-commit");
+    const direct = run("sh", [hook, "a"], "piped\n");
+    expect(direct).toContain('args=["a"] stdin="piped\\n"');
+});

ts/packages/git-story/test/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "composite": true,
+    "rootDir": ".",
+    "outDir": "../dist/test",
+    "types": ["node", "jest"]
+  },
+  "include": ["./**/*"],
+  "ts-node": {
+    "esm": true
+  },
+  "references": [{ "path": "../src" }]
+}

ts/packages/git-story/tsconfig.json

@@ -7,6 +7,9 @@
   "references": [
     {
       "path": "./src"
+    },
+    {
+      "path": "./test"
     }
   ],
   "ts-node": {