test: sandbox the data dir when tests run from a package directory

apps/amp-plugin/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/guides-show/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/hook/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/marketing/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/opencode-plugin/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/paste-service/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/pi-extension/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/skills/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

apps/vscode-extension/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/ai/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/core/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/editor/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/guide-viewer/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/review-editor/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/server/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/server/storage.test.ts

@@ -6,7 +6,7 @@
 
 import { afterEach, describe, expect, test } from "bun:test";
 import { mkdtempSync, rmSync, readFileSync, readdirSync } from "node:fs";
-import { tmpdir } from "node:os";
+import { homedir, tmpdir } from "node:os";
 import { join } from "node:path";
 import { generateSlug, getPlanDir, savePlan, saveToHistory, getPlanVersion, getVersionCount, listVersions } from "./storage";
 
@@ -61,9 +61,11 @@ describe("getPlanDir", () => {
   });
 
   test("expands tilde in custom path", () => {
-    const result = getPlanDir("~/.plannotator/test-plans");
+    // getPlanDir mkdirs its result, and os.homedir() ignores a HOME override, so
+    // expand bare "~": the real home already exists and nothing is created in it.
+    const result = getPlanDir("~");
     expect(result).not.toContain("~");
-    expect(result).toMatch(/\.plannotator\/test-plans$/);
+    expect(result).toBe(homedir());
   });
 
   test("uses default when no custom path", () => {

packages/shared/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

packages/ui/bunfig.toml

@@ -0,0 +1,6 @@
+# Bun reads only the bunfig.toml in the directory `bun test` runs from, so the
+# root preloads are mirrored here for runs from this package directory. Keep in
+# step with the root bunfig.toml [test] section (guarded by
+# tests/package-bunfig.test.ts).
+[test]
+preload = ["../../tests/setup/feedback-archive-off.ts", "../../packages/ui/test-setup/happy-dom.ts"]

tests/package-bunfig.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, test } from "bun:test";
+import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
+import { join, relative, resolve } from "node:path";
+
+/**
+ * Bun reads only the bunfig.toml in the directory `bun test` runs from. Without
+ * a package-level copy, `bun test` inside a package skips the root preloads and
+ * tests write drafts, history, and feedback into the contributor's real
+ * ~/.plannotator. Catches a package that gains tests without a bunfig, or a
+ * package bunfig that drifts from the root preload list.
+ */
+const repoRoot = resolve(import.meta.dir, "..");
+
+function readPreload(bunfigPath: string): string[] {
+  const parsed = Bun.TOML.parse(readFileSync(bunfigPath, "utf-8")) as {
+    test?: { preload?: string[] };
+  };
+  return parsed.test?.preload ?? [];
+}
+
+function hasTestFiles(dir: string): boolean {
+  for (const entry of readdirSync(dir)) {
+    if (entry === "node_modules" || entry === "dist" || entry.startsWith(".")) continue;
+    const full = join(dir, entry);
+    if (statSync(full).isDirectory()) {
+      if (hasTestFiles(full)) return true;
+    } else if (/\.test\.tsx?$/.test(entry)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+const rootPreload = readPreload(join(repoRoot, "bunfig.toml")).map((p) => resolve(repoRoot, p));
+
+const packageDirs = ["apps", "packages"].flatMap((group) =>
+  readdirSync(join(repoRoot, group))
+    .map((name) => join(repoRoot, group, name))
+    .filter((dir) => statSync(dir).isDirectory() && hasTestFiles(dir)),
+);
+
+describe("package-directory bunfig.toml", () => {
+  test("root preload sandboxes the data dir", () => {
+    expect(rootPreload).toContain(resolve(repoRoot, "tests/setup/feedback-archive-off.ts"));
+  });
+
+  for (const dir of packageDirs) {
+    const label = relative(repoRoot, dir);
+    test(`${label} mirrors the root test preloads`, () => {
+      const bunfig = join(dir, "bunfig.toml");
+      expect(existsSync(bunfig)).toBe(true);
+      expect(readPreload(bunfig).map((p) => resolve(dir, p))).toEqual(rootPreload);
+    });
+  }
+});