Write unit tests

__tests__/Answer.test.js

@@ -0,0 +1,13 @@
+import React from "react";
+import { render } from "@testing-library/react";
+import Answer from "../components/Answer";
+import "@testing-library/jest-dom";
+
+describe("Answer component", () => {
+  it("should render the text correctly", () => {
+    const text = "This is the answer text";
+    const { getByText } = render(<Answer text={text} />);
+    const answerElement = getByText(text);
+    expect(answerElement).toBeInTheDocument();
+  });
+});

__tests__/Footer.test.js

@@ -0,0 +1,14 @@
+import React from "react";
+import { render, screen } from "@testing-library/react";
+import Footer from "../components/Footer";
+import "@testing-library/jest-dom";
+
+describe("Footer Component", () => {
+  it("should render the footer text", () => {
+    render(<Footer />);
+    const footerText = screen.getByText((content, element) => {
+      return content.startsWith("Made with");
+    });
+    expect(footerText).toBeInTheDocument();
+  });
+});

__tests__/Question.test.js

@@ -0,0 +1,13 @@
+import React from "react";
+import { render } from "@testing-library/react";
+import Question from "../components/Question";
+import "@testing-library/jest-dom";
+
+describe("Question component", () => {
+  it("should render the text correctly", () => {
+    const text = "This is the Question text";
+    const { getByText } = render(<Question text={text} />);
+    const QuestionElement = getByText(text);
+    expect(QuestionElement).toBeInTheDocument();
+  });
+});

__tests__/QueueSection.test.js

@@ -0,0 +1,39 @@
+import React from "react";
+import { render, screen } from "@testing-library/react";
+import QueueSection from "../components/QueueSection";
+
+describe("QueueSection Component", () => {
+  it("should render the current active job", () => {
+    const activeJob = "Active Job Title";
+    render(<QueueSection active={activeJob} />);
+    const activeJobTitle = screen.getByText("Current active");
+    const activeJobDescription = screen.getByText(activeJob);
+    expect(activeJobTitle).toBeInTheDocument();
+    expect(activeJobDescription).toBeInTheDocument();
+  });
+
+  it("should render 'No active job' when no active job provided", () => {
+    render(<QueueSection active={null} />);
+    const activeJobTitle = screen.getByText("Current active");
+    const noActiveJobMessage = screen.getByText("No active job");
+    expect(activeJobTitle).toBeInTheDocument();
+    expect(noActiveJobMessage).toBeInTheDocument();
+  });
+
+  it("should render the next job", () => {
+    const nextJob = "Next Job Title";
+    render(<QueueSection waiting={nextJob} />);
+    const nextJobTitle = screen.getByText("Next job");
+    const nextJobDescription = screen.getByText(nextJob);
+    expect(nextJobTitle).toBeInTheDocument();
+    expect(nextJobDescription).toBeInTheDocument();
+  });
+
+  it("should render 'No waiting job' when no next job provided", () => {
+    render(<QueueSection waiting={null} />);
+    const nextJobTitle = screen.getByText("Next job");
+    const noWaitingJobMessage = screen.getByText("No waiting job");
+    expect(nextJobTitle).toBeInTheDocument();
+    expect(noWaitingJobMessage).toBeInTheDocument();
+  });
+});

__tests__/ShowQueue.test.js

@@ -0,0 +1,35 @@
+import React from "react";
+import { render } from "@testing-library/react";
+import ShowQueue from "../components/ShowQueue";
+import "@testing-library/jest-dom";
+
+describe("ShowQueue Component", () => {
+  it("renders the component with library name and queue data", () => {
+    const data = {
+      waiting: 10,
+      active: 5,
+      completed: 20,
+      failed: 3,
+      delayed: 2,
+    };
+    const library = "Sample Library";
+
+    const { getByText } = render(<ShowQueue data={data} library={library} />);
+    expect(getByText("Sample Library")).toBeInTheDocument();
+    expect(getByText("Waiting: 10")).toBeInTheDocument();
+    expect(getByText("Active: 5")).toBeInTheDocument();
+    expect(getByText("Completed: 20")).toBeInTheDocument();
+    expect(getByText("Failed: 3")).toBeInTheDocument();
+    expect(getByText("Delayed: 2")).toBeInTheDocument();
+  });
+
+  it("renders the component with no data", () => {
+    const { getByText } = render(<ShowQueue data={{}} library="No Data" />);
+    expect(getByText("No Data")).toBeInTheDocument();
+    expect(getByText("Waiting:")).toBeInTheDocument();
+    expect(getByText("Active:")).toBeInTheDocument();
+    expect(getByText("Completed:")).toBeInTheDocument();
+    expect(getByText("Failed:")).toBeInTheDocument();
+    expect(getByText("Delayed:")).toBeInTheDocument();
+  });
+});

__tests__/UploadedItems.test.js

@@ -0,0 +1,28 @@
+import React from "react";
+import { render, waitFor } from "@testing-library/react";
+import "@testing-library/jest-dom";
+import UploadedItems from "../components/UploadedItems";
+
+global.fetch = jest.fn(() =>
+  Promise.resolve({
+    json: () =>
+      Promise.resolve({
+        response: {
+          numFound: 42,
+        },
+      }),
+  })
+);
+
+describe("UploadedItems Component", () => {
+  it("fetches and displays the number of books uploaded", async () => {
+    const { getByText } = render(<UploadedItems />);
+
+    await waitFor(() => {
+      expect(fetch).toHaveBeenCalledTimes(1);
+      expect(
+        getByText("42 books uploaded to Internet Archive using BUB2!")
+      ).toBeInTheDocument();
+    });
+  });
+});

jest.config.js

@@ -0,0 +1,10 @@
+const nextJest = require("next/jest");
+const createJestConfig = nextJest({
+  dir: "./",
+});
+const customJestConfig = {
+  moduleDirectories: ["node_modules", "<rootDir>/"],
+  testEnvironment: "jest-environment-jsdom",
+  setupFilesAfterEnv: ["@testing-library/jest-dom"],
+};
+module.exports = createJestConfig(customJestConfig);

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build;",
-    "start": "npm run build; NODE_ENV=production node server.js"
+    "start": "npm run build; NODE_ENV=production node server.js",
+    "test": "jest --watch"
   },
   "husky": {
     "hooks": {
@@ -73,9 +74,14 @@
     "winston": "^3.9.0"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.1.3",
+    "@testing-library/react": "^12.1.5",
+    "@testing-library/user-event": "^14.5.1",
     "@wikimedia/codex": "^0.13.0",
     "@wikimedia/codex-design-tokens": "^0.13.0",
     "husky": "^4.2.3",
+    "jest": "^29.7.0",
+    "jest-environment-jsdom": "^29.7.0",
     "lint-staged": "^10.0.9",
     "prettier": "2.0.2"
   }