Merge pull request #406 from OHTU-German-learning-website/383-implement-tests-for-db-text-fetching

tests added for database fetch

gradesa/src/app/api/html-content/[id]/dbfetch.test.js

@@ -0,0 +1,50 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { GET } from "./route";
+import { useTestDatabase } from "@/backend/test/testdb";
+import { useTestRequest } from "@/backend/test/mock-request";
+import { getHTMLContent } from "@/backend/html-services";
+
+vi.mock("@/backend/html-services", () => ({
+  getHTMLContent: vi.fn(),
+}));
+
+describe("GET /api/html-content/[id]", () => {
+  useTestDatabase();
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  const getRequest = async (id) => {
+    const { mockGet } = useTestRequest();
+    const req = mockGet(`/api/html-content/${id}`);
+    return GET(req);
+  };
+
+  it("should return HTML content as JSON", async () => {
+    getHTMLContent.mockResolvedValueOnce("<p>Mocked HTML</p>");
+
+    const response = await getRequest(1);
+    const body = await response.json();
+
+    expect(getHTMLContent).toHaveBeenCalledWith("1");
+    expect(response.status).toBe(200);
+    expect(body).toEqual({ content: "<p>Mocked HTML</p>" });
+  });
+
+  it("should return null if content not found", async () => {
+    getHTMLContent.mockResolvedValueOnce(null);
+
+    const response = await getRequest(999);
+    const body = await response.json();
+
+    expect(response.status).toBe(200);
+    expect(body).toEqual({ content: null });
+  });
+
+  it("should throw on DB errors", async () => {
+    getHTMLContent.mockRejectedValueOnce(new Error("DB failure"));
+
+    await expect(getRequest(1)).rejects.toThrow("DB failure");
+  });
+});