diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 00000000..ee9d1a22
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,9 @@
+{
+  "name": "OpenCode Development Container",
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:5-22-bookworm",
+  "features": {
+    "ghcr.io/devcontainers-extra/features/bun:1": {
+      "version": "1.3.14"
+    }
+  }
+}
\ No newline at end of file
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2e05ce79..58739c5a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -43,6 +43,11 @@ jobs:
       - name: Setup Bun
         uses: ./.github/actions/setup-bun
 
+      - name: Run updater action tests
+        timeout-minutes: 2
+        working-directory: packages/app
+        run: bun test --conditions=solid --preload ./happydom.ts ./src/components/updater-action.test.ts
+
       - name: Configure git identity
         run: |
           git config --global user.email "bot@opencode.ai"
diff --git a/packages/app/src/components/updater-action.test.ts b/packages/app/src/components/updater-action.test.ts
index 46e7c732..b4ddc855 100644
--- a/packages/app/src/components/updater-action.test.ts
+++ b/packages/app/src/components/updater-action.test.ts
@@ -1,26 +1,63 @@
 import { describe, expect, test } from "bun:test"
+import type { UpdaterState } from "@/updater"
 import { updaterAction } from "./updater-action"
 
 describe("updaterAction", () => {
-  test("disables update actions when the platform has no updater", () => {
-    expect(updaterAction(undefined)).toEqual({ label: "settings.updates.action.checkNow" })
-  })
+  const cases: {
+    name: string
+    state: UpdaterState | undefined
+    expected: ReturnType<typeof updaterAction>
+  }[] = [
+    {
+      name: "uses check now without an action when state is unavailable",
+      state: undefined,
+      expected: { label: "settings.updates.action.checkNow" },
+    },
+    {
+      name: "uses check now without an action when updates are disabled",
+      state: { status: "disabled" },
+      expected: { label: "settings.updates.action.checkNow" },
+    },
+    {
+      name: "allows checking when the updater is idle",
+      state: { status: "idle" },
+      expected: { label: "settings.updates.action.checkNow", run: "check" },
+    },
+    {
+      name: "shows checking without an action while checking",
+      state: { status: "checking" },
+      expected: { label: "settings.updates.action.checking" },
+    },
+    {
+      name: "shows downloading without an action while downloading",
+      state: { status: "downloading", version: "1.2.3", percent: 50 },
+      expected: { label: "settings.updates.action.downloading" },
+    },
+    {
+      name: "allows installation when an update is ready",
+      state: { status: "ready", version: "1.2.3" },
+      expected: { label: "toast.update.action.installRestart", run: "install" },
+    },
+    {
+      name: "shows installing without an action while installing",
+      state: { status: "installing", version: "1.2.3" },
+      expected: { label: "settings.updates.action.installing" },
+    },
+    {
+      name: "allows another check when already up to date",
+      state: { status: "up-to-date" },
+      expected: { label: "settings.updates.action.checkNow", run: "check" },
+    },
+    {
+      name: "allows retrying a check after an error",
+      state: { status: "error", message: "Update failed" },
+      expected: { label: "settings.updates.action.checkNow", run: "check" },
+    },
+  ]
 
-  test("projects updater transitions into one settings action", () => {
-    expect(updaterAction({ status: "idle" })).toEqual({
-      label: "settings.updates.action.checkNow",
-      run: "check",
+  for (const item of cases) {
+    test(item.name, () => {
+      expect(updaterAction(item.state)).toEqual(item.expected)
     })
-    expect(updaterAction({ status: "checking" })).toEqual({ label: "settings.updates.action.checking" })
-    expect(updaterAction({ status: "downloading", version: "2.0.0" })).toEqual({
-      label: "settings.updates.action.downloading",
-    })
-    expect(updaterAction({ status: "ready", version: "2.0.0" })).toEqual({
-      label: "toast.update.action.installRestart",
-      run: "install",
-    })
-    expect(updaterAction({ status: "installing", version: "2.0.0" })).toEqual({
-      label: "settings.updates.action.installing",
-    })
-  })
+  }
 })
diff --git a/packages/app/src/components/updater-action.ts b/packages/app/src/components/updater-action.ts
index 9c13c542..a37cf610 100644
--- a/packages/app/src/components/updater-action.ts
+++ b/packages/app/src/components/updater-action.ts
@@ -4,22 +4,24 @@ import { usePlatform } from "@/context/platform"
 import { useLanguage } from "@/context/language"
 import { showToast } from "@/utils/toast"
 
-export function updaterAction(state: UpdaterState | undefined) {
-  if (!state) return { label: "settings.updates.action.checkNow" as const }
-  switch (state.status) {
-    case "checking":
-      return { label: "settings.updates.action.checking" as const }
-    case "downloading":
-      return { label: "settings.updates.action.downloading" as const }
-    case "ready":
-      return { label: "toast.update.action.installRestart" as const, run: "install" as const }
-    case "installing":
-      return { label: "settings.updates.action.installing" as const }
-    case "disabled":
-      return { label: "settings.updates.action.checkNow" as const }
-    default:
-      return { label: "settings.updates.action.checkNow" as const, run: "check" as const }
-  }
+const updaterActions = {
+  disabled: { label: "settings.updates.action.checkNow" },
+  idle: { label: "settings.updates.action.checkNow", run: "check" },
+  checking: { label: "settings.updates.action.checking" },
+  downloading: { label: "settings.updates.action.downloading" },
+  ready: { label: "toast.update.action.installRestart", run: "install" },
+  installing: { label: "settings.updates.action.installing" },
+  "up-to-date": { label: "settings.updates.action.checkNow", run: "check" },
+  error: { label: "settings.updates.action.checkNow", run: "check" },
+} as const satisfies Record<UpdaterState["status"], { label: string; run?: "check" | "install" }>
+
+type UpdaterAction = {
+  label: (typeof updaterActions)[UpdaterState["status"]]["label"]
+  run?: "check" | "install"
+}
+
+export function updaterAction(state: UpdaterState | undefined): UpdaterAction {
+  return updaterActions[state?.status ?? "disabled"]
 }
 
 export function useUpdaterAction() {