Add tests for admin pages

tests/testcafe/admin.test.ts

@@ -3,7 +3,7 @@
  * This file is used by TestCafé to run end-to-end tests with chrome against the site.
  * Tests are grouped into fixtures and fixtures into files.
  */
-import { Selector } from "testcafe";
+import { Selector, ClientFunction } from "testcafe";
 
 fixture`Admin page renders and functions correctly`.page("http://localhost:3000/admin");
 
@@ -15,3 +15,56 @@ test("Header contains text \"Admin panel\"", async t => {
   await t.expect(header.textContent)
          .contains("Admin panel");
 });
+
+fixture`Admin login page functions correctly`.page("http://localhost:3000/admin/login");
+
+test("Login form exists", async t => {
+  /**
+   * Test if the page contains a form.
+   */
+  const form = Selector("form.admin-login-form");
+  await t.expect(form.exists).ok();
+});
+
+test("User can log in with default credentials", async t => {
+  /**
+   * Test if the user can log in with default credentials.
+   */
+  const USERNAME = "admin";
+  const PASSWORD = "password123";
+
+  await t.typeText(Selector("#login-username"), USERNAME);
+  await t.typeText(Selector("#login-password"), PASSWORD);
+  await t.click(Selector("#login-submit"));
+
+  const frontPage = Selector(".admin-front-page");
+  await t.expect(frontPage.exists).ok();
+});
+
+test("User can log out and is redirected to login", async t => {
+  /**
+   * Test if the user can log out.
+   */
+  await t.click(Selector("#login-submit"));
+
+  const logout = Selector("#admin-sidebar-logout");
+  await t.click(logout);
+
+  const loginForm = Selector("form.admin-login-form");
+  await t.expect(loginForm.exists).ok();
+});
+
+test("User is redirected to login when JWT token is invalid", async t => {
+  /**
+   * Test if the user is redirected to login when JWT token is invalid.
+   */
+  const TOKEN = "FOOBAR";
+  const setCookie = ClientFunction(() => {
+    document.cookie = `jwt=${TOKEN}`;
+  });
+
+  await t.navigateTo("/admin/events");
+
+  const loginForm = Selector("form.admin-login-form");
+  await t.expect(loginForm.exists).ok();
+});