test: add e2e test for /api/v0/version endpoint

e2e-tests/version-response.spec.ts

@@ -0,0 +1,28 @@
+import { test, expect } from '@playwright/test'
+import { PORT } from '../src/constants.js'
+
+function validateResponse (content: string): void {
+  expect(() => JSON.parse(content)).not.toThrow()
+  const versionObj = JSON.parse(content)
+
+  expect(versionObj).toHaveProperty('Version')
+  expect(versionObj).toHaveProperty('Commit')
+}
+
+test('GET /api/v0/version', async ({ page }) => {
+  const result = await page.goto(`http://localhost:${PORT}/api/v0/version`)
+  expect(result?.status()).toBe(200)
+
+  const maybeContent = await result?.text()
+  expect(maybeContent).not.toBe(undefined)
+  validateResponse(maybeContent as string)
+})
+
+test('POST /api/v0/version', async ({ page }) => {
+  const result = await page.request.post(`http://localhost:${PORT}/api/v0/version`)
+  expect(result?.status()).toBe(200)
+
+  const maybeContent = await result?.text()
+  expect(maybeContent).not.toBe(undefined)
+  validateResponse(maybeContent)
+})