Add a failing test for the settings overlay's fixture fallback

Author: TheGreatAxios

src/tui-opentui/overlay-fixture-fallback.test.ts

@@ -0,0 +1,37 @@
+/**
+ * CL-5596: a missing surface dependency must produce an honest empty state,
+ * never the hardcoded rows from residuals.ts rendered as if they were real.
+ */
+import { describe, expect, test } from "bun:test"
+
+import { openSettingsSurface, type CommandSurfaceDeps } from "./command-surfaces.js"
+import { withTestRenderer } from "./harness.js"
+import { createAppShell } from "./shell.js"
+
+describe("overlay dependency gaps never render fixture content", () => {
+  test("settings surface without a settings dependency shows no fabricated rows", async () => {
+    await withTestRenderer(
+      async (h) => {
+        const shell = createAppShell(h.renderer, {
+          terminal: { columns: 80, rows: 24 },
+          run: "idle",
+        })
+        try {
+          const notified: string[] = []
+          const deps: CommandSurfaceDeps = { notify: (text) => notified.push(text) }
+
+          openSettingsSurface(shell, deps)
+
+          expect(shell.overlayItems).not.toContain(
+            "Permissions — revoke remembered approvals",
+          )
+          expect(shell.overlayItems).not.toContain("Compaction — summarize vs drop")
+          expect(notified.length).toBeGreaterThan(0)
+        } finally {
+          shell.dispose()
+        }
+      },
+      { width: 80, height: 24 },
+    )
+  })
+})