fix(widgets): preserve data on integration failures (#6484)

packages/api/src/test/settle-integrations.spec.ts

@@ -0,0 +1,50 @@
+import { describe, expect, test, vi } from "vitest";
+
+import { settleIntegrationQueries } from "../settle-integrations";
+
+const mocks = vi.hoisted(() => ({
+  logger: { warn: vi.fn() },
+}));
+
+vi.mock("@homarr/core/infrastructure/logs", () => ({
+  createLogger: () => mocks.logger,
+}));
+
+vi.mock("@homarr/core/infrastructure/logs/error", () => ({
+  ErrorWithMetadata: Error,
+}));
+
+const integrations = [
+  { id: "first", name: "First", kind: "plex" },
+  { id: "second", name: "Second", kind: "jellyfin" },
+];
+
+describe("settleIntegrationQueries", () => {
+  test("returns an empty result when no integrations are configured", async () => {
+    await expect(settleIntegrationQueries([], vi.fn())).resolves.toEqual([]);
+  });
+
+  test("keeps successful integrations when another integration fails", async () => {
+    const error = new Error("Plex unavailable");
+
+    await expect(
+      settleIntegrationQueries(integrations, (integration) =>
+        integration.id === "first" ? Promise.reject(error) : Promise.resolve(integration.name),
+      ),
+    ).resolves.toEqual(["Second"]);
+  });
+
+  test("rejects when every integration fails", async () => {
+    const error = new Error("Integration unavailable");
+
+    await expect(settleIntegrationQueries(integrations, () => Promise.reject(error))).rejects.toBe(error);
+  });
+
+  test("uses configured fallbacks when every integration fails", async () => {
+    await expect(
+      settleIntegrationQueries(integrations, () => Promise.reject(new Error("Integration unavailable")), {
+        fallback: (integration) => integration.name,
+      }),
+    ).resolves.toEqual(["First", "Second"]);
+  });
+});