added fixture breadth and regression coverage

tests/fixtures.py

@@ -39,3 +39,37 @@ def write_misleading_docs_repo(root: Path) -> Path:
         encoding="utf-8",
     )
     return repo
+
+
+def write_javascript_typescript_package_repo(root: Path) -> Path:
+    repo = root / "js-ts-package"
+    repo.mkdir()
+    (repo / "README.md").write_text(
+        "# JS TS Package\n\nExposes browser and API package code.\n",
+        encoding="utf-8",
+    )
+    (repo / "package.json").write_text(
+        '{"dependencies":{"react":"latest","vite":"latest"},'
+        '"devDependencies":{"vitest":"latest"}}',
+        encoding="utf-8",
+    )
+    (repo / "src").mkdir()
+    (repo / "src" / "api").mkdir()
+    (repo / "src" / "api" / "routes.ts").write_text(
+        "export function routeRequest(input: Request): Response {\n"
+        "  return new Response('ok')\n"
+        "}\n",
+        encoding="utf-8",
+    )
+    (repo / "src" / "api" / "routes.spec.ts").write_text(
+        "import { describe, it } from 'vitest'\n"
+        "describe('routes', () => { it('works', () => {}) })\n",
+        encoding="utf-8",
+    )
+    return repo
+
+
+def write_empty_repo(root: Path) -> Path:
+    repo = root / "empty-repo"
+    repo.mkdir()
+    return repo