test(api): close assistant split regression gaps

packages/api/src/__tests__/assistant-tools-holiday-resolution-errors.test.ts

@@ -0,0 +1,64 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import {
+  createToolContext,
+  executeTool,
+} from "./assistant-tools-holiday-read-test-helpers.js";
+
+describe("assistant holiday resolution error paths", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns a stable assistant error when a regional holiday range is incomplete", async () => {
+    const ctx = createToolContext({});
+
+    const result = await executeTool(
+      "list_holidays_by_region",
+      JSON.stringify({ countryCode: "DE", periodStart: "2026-01-01" }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "periodStart and periodEnd must both be provided when using a custom holiday range.",
+    });
+  });
+
+  it("returns a stable assistant error when resource holidays are requested for an unknown resource", async () => {
+    const ctx = createToolContext({
+      resource: {
+        findUnique: vi.fn().mockResolvedValue(null),
+        findFirst: vi.fn().mockResolvedValue(null),
+        findMany: vi.fn().mockResolvedValue([]),
+      },
+    });
+
+    const result = await executeTool(
+      "get_resource_holidays",
+      JSON.stringify({ identifier: "missing-resource", year: 2026 }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Resource not found: missing-resource",
+    });
+  });
+
+  it("returns a stable assistant error when a holiday preview references an unknown country", async () => {
+    const ctx = createToolContext({
+      country: {
+        findUnique: vi.fn().mockResolvedValue(null),
+      },
+    });
+
+    const result = await executeTool(
+      "preview_resolved_holiday_calendar",
+      JSON.stringify({ countryId: "missing-country", year: 2026 }),
+      ctx,
+    );
+
+    expect(JSON.parse(result.content)).toEqual({
+      error: "Country not found with the given criteria.",
+    });
+  });
+});