test(app): model picker smoke test

2 files changed, 50 insertions, 6 deletions

diff --git a/packages/app/e2e/model-picker.spec.ts b/packages/app/e2e/model-picker.spec.ts
new file mode 100644
index 000000000..9e64b3dfb
--- /dev/null
+++ b/packages/app/e2e/model-picker.spec.ts
@@ -0,0 +1,43 @@
+import { test, expect } from "./fixtures"
+import { promptSelector } from "./utils"
+
+test("smoke model selection updates prompt footer", async ({ page, gotoSession }) => {
+  await gotoSession()
+
+  await page.locator(promptSelector).click()
+  await page.keyboard.type("/model")
+
+  const command = page.locator('[data-slash-id="model.choose"]')
+  await expect(command).toBeVisible()
+  await command.hover()
+
+  await page.keyboard.press("Enter")
+
+  const dialog = page.getByRole("dialog")
+  await expect(dialog).toBeVisible()
+
+  const input = dialog.getByRole("textbox").first()
+
+  const selected = dialog.locator('[data-slot="list-item"][data-selected="true"]').first()
+  await expect(selected).toBeVisible()
+
+  const other = dialog.locator('[data-slot="list-item"]:not([data-selected="true"])').first()
+  const target = (await other.count()) > 0 ? other : selected
+
+  const key = await target.getAttribute("data-key")
+  if (!key) throw new Error("Failed to resolve model key from list item")
+
+  const name = (await target.locator("span").first().innerText()).trim()
+  const model = key.split(":").slice(1).join(":")
+
+  await input.fill(model)
+
+  const item = dialog.locator(`[data-slot="list-item"][data-key="${key}"]`)
+  await expect(item).toBeVisible()
+  await item.click()
+
+  await expect(dialog).toHaveCount(0)
+
+  const form = page.locator(promptSelector).locator("xpath=ancestor::form[1]")
+  await expect(form.locator('[data-component="button"]').filter({ hasText: name }).first()).toBeVisible()
+})
diff --git a/specs/08-app-e2e-smoke-suite.md b/specs/08-app-e2e-smoke-suite.md
index 3447c18c0..1a7a7a7dc 100644
--- a/specs/08-app-e2e-smoke-suite.md
+++ b/specs/08-app-e2e-smoke-suite.md
@@ -24,7 +24,7 @@ Add 6 smoke tests to `packages/app/e2e/`:
 - [x] 1. Settings dialog open / switch / close (`packages/app/e2e/settings.spec.ts`)
 - [x] 2. Prompt slash command path: `/open` opens file picker (`packages/app/e2e/prompt-slash-open.spec.ts`)
 - [x] 3. Prompt @mention inserts a file pill token (`packages/app/e2e/prompt-mention.spec.ts`)
-- [ ] 4. Model selection UI works end-to-end
+- [x] 4. Model selection UI works end-to-end (`packages/app/e2e/model-picker.spec.ts`)
 - [ ] 5. File viewer renders real file content
 - [ ] 8. Terminal init + create new terminal
 
@@ -162,10 +162,11 @@ Steps:
 
 1. `await gotoSession()`.
 2. Focus prompt, type `/model`, press `Enter`.
-3. In the model dialog, use the search field to filter to a deterministic model, e.g. `qwen3-coder`.
-4. Select the first matching model.
-5. Assert dialog closed.
-6. Assert the prompt footer now shows the chosen model name.
+3. In the model dialog, pick a visible model that is not the current selection (if available).
+4. Use the search field to filter to that model (use its id from the list item's `data-key` to avoid time-based model visibility drift).
+5. Select the filtered model.
+6. Assert dialog closed.
+7. Assert the prompt footer now shows the chosen model name.
 
 Acceptance criteria:
 
@@ -217,7 +218,7 @@ These tests run with `fullyParallel: true` in `packages/app/playwright.config.ts
 - Avoid ordering-based assertions: never assume a “first” session/project/file is stable unless you filtered by unique text.
 - Prefer deterministic targets:
   - use `packages/app/package.json` rather than bare `package.json` (multiple hits possible)
-  - filter model search to a specific id/name (e.g. `qwen3-coder`)
+  - for models, avoid hardcoding a single model id; pick from the visible list and filter by its `data-key` instead
 - Prefer robust selectors:
   - role selectors: `getByRole('dialog')`, `getByRole('textbox')`, `getByRole('tab')`
   - stable data attributes already present: `promptSelector`, `[data-component="terminal"]`