Try a test that fails with the locking issue.

Author: cderv

tests/docs/render-output-dir/.gitignore

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+/.quarto/
+**/*.quarto_ipynb

tests/docs/render-output-dir/test.qmd

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+---
+title: "Test Output Dir"
+format: html
+---
+
+This is a simple document to test rendering with --output-dir flag.

tests/smoke/render/render-output-dir.test.ts

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+/*
+* render-output-dir.test.ts
+*
+* Test for Windows file locking issue with --output-dir flag
+* Regression test for: https://github.com/quarto-dev/quarto-cli/issues/XXXXX
+*
+* Copyright (C) 2020-2025 Posit Software, PBC
+*
+*/
+import { dirname, join } from "../../../src/deno_ral/path.ts";
+import { existsSync, safeRemoveSync } from "../../../src/deno_ral/fs.ts";
+import { docs } from "../../utils.ts";
+import { isWindows } from "../../../src/deno_ral/platform.ts";
+import { pathDoNotExists } from "../../verify.ts";
+import { testRender } from "./render.ts";
+
+if (isWindows) {
+  const inputDir =  docs("render-output-dir/");
+  const quartoDir = ".quarto"
+  const outputDir = "output-test-dir"
+
+  testRender(
+    "test.qmd",
+    "html",
+    true,
+    [pathDoNotExists(quartoDir)],
+    {
+      cwd: () => inputDir,
+      setup: async () => {
+        // Ensure output and quarto dirs are removed before test
+        if (existsSync(outputDir)) {
+          safeRemoveSync(outputDir, { recursive: true });
+        }
+        if (existsSync(quartoDir)) {
+          safeRemoveSync(quartoDir, { recursive: true });
+        }
+      },
+      teardown: async () => {
+        if (existsSync(outputDir)) {
+          safeRemoveSync(outputDir, { recursive: true });
+        }
+        if (existsSync(quartoDir)) {
+              safeRemoveSync(quartoDir, { recursive: true });
+        }
+      },
+    },  
+    ["--output-dir", outputDir],
+    outputDir,
+  );
+}