preRenderedIndexPages.test.js

// Test that next-on-netlify does not crash when pre-rendering index.js file.
// See: https://github.com/netlify/next-on-netlify/issues/2#issuecomment-636415494

const { parse, join } = require("path");
const { existsSync, readdirSync, readFileSync } = require("fs-extra");
const buildNextApp = require("./helpers/buildNextApp");

// The name of this test file (without extension)
const FILENAME = parse(__filename).name;

// The directory which will be used for testing.
// We simulate a NextJS app within that directory, with pages, and a
// package.json file.
const PROJECT_PATH = join(__dirname, "builds", FILENAME);

// Capture the output to verify successful build
let buildOutput;

beforeAll(
  async () => {
    buildOutput = await buildNextApp()
      .forTest(__filename)
      .withPages("pages-with-prerendered-index")
      .withNextConfig("next.config.js")
      .withPackageJson("package.json")
      .build();
  },
  // time out after 180 seconds
  180 * 1000
);

describe("next-on-netlify", () => {
  test("builds successfully", () => {
    expect(buildOutput).toMatch("Next on Netlify");
    expect(buildOutput).toMatch("Success! All done!");
  });
});

describe("Static Pages", () => {
  test("copies static pages to output directory", () => {
    const OUTPUT_PATH = join(PROJECT_PATH, "out_publish");

    expect(existsSync(join(OUTPUT_PATH, "index.html"))).toBe(true);
    expect(existsSync(join(OUTPUT_PATH, "shows.html"))).toBe(true);
  });

  test("copies static assets to out_publish/_next/ directory", () => {
    const dirs = readdirSync(
      join(PROJECT_PATH, "out_publish", "_next", "static")
    );

    expect(dirs.length).toBe(2);
    expect(dirs).toContain("chunks");
  });
});

describe("404 Page", () => {
  test("copies 404.html to output directory", () => {
    const OUTPUT_PATH = join(PROJECT_PATH, "out_publish");

    expect(existsSync(join(OUTPUT_PATH, "404.html"))).toBe(true);
  });
});

describe("Routing", () => {
  test("does not create any redirects", async () => {
    // Read _redirects file
    const contents = readFileSync(
      join(PROJECT_PATH, "out_publish", "_redirects")
    );
    const redirects = contents.toString();

    // Check that no redirects are present
    expect(redirects).toEqual("");
  });
});