test(*): Add basic BDD tests

tests/bdd/steps/assessment_steps.ts

@@ -0,0 +1,17 @@
+import { Given, When, Then } from '@cucumber/cucumber';
+import { expect } from '@playwright/test';
+
+Given('I am on the homepage', async function () {
+  await this.page.goto('http://localhost:5173/');
+});
+
+When('I fill in the assessment form and submit', async function () {
+  await this.page.fill('textarea[name="assessment"]', 'Sample student submission');
+  await this.page.click('button[type="submit"]');
+});
+
+Then('I should see my feedback displayed', async function () {
+  await this.page.waitForSelector('.feedback');
+  const feedback = await this.page.textContent('.feedback');
+  expect(feedback).toBeTruthy();
+});