Playwright end-to-end coverage for changelog (DX-024) + unit tests for pipeline (DX-023)

e2e/changelog-functional.spec.ts

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+import { expect, test } from "@playwright/test"
+import type { Page } from "@playwright/test"
+import { readFileSync } from "node:fs"
+import { join } from "node:path"
+
+/**
+ * DX-024: End-to-end coverage for changelog functional behaviors.
+ *
+ * Tests browser-level interactions that are invisible to unit tests:
+ * - Deep links resolving and scrolling into view
+ * - URL filters persisting across reload
+ * - Search with debounce
+ * - Archive loading on demand
+ * - Clipboard copy behavior
+ * - Navbar indicator state (WhatsNewDot)
+ *
+ * Stability strategy (matching DX-022):
+ * - Fixture intercepted before any app fetch (changelog.json route)
+ * - Clock frozen to prevent timestamp drift
+ * - localStorage seeded for deterministic state
+ * - No arbitrary sleeps; waits on assertions and network state
+ * - Dev server (bun run dev) exercises real build artifact serving
+ */
+
+const changelogFixture = JSON.parse(
+  readFileSync(join(__dirname, "fixtures", "changelog.json"), "utf-8"),
+)
+
+// Archive fixture for deep-link tests (v0.1.0 is not in recent releases)
+const archiveFixture = {
+  releases: [
+    {
+      version: "0.1.0",
+      date: "2026-07-15",
+      yanked: false,
+      entries: [
+        {
+          type: "added",
+          area: "general",
+          text: "First public release.",
+          pr: null,
+          breaking: false,
+        },
+      ],
+    },
+  ],
+}
+
+async function stubExternalNetwork(page: Page) {
+  // Block analytics, external APIs, images that aren't part of the changelog
+  await page.route("**/api.binance.com/**", (route) =>
+    route.fulfill({ status: 200, contentType: "application/json", body: "[]" }),
+  )
+  await page.route("**/oracle.biscotti-proxy-worker.workers.dev/**", (route) =>
+    route.fulfill({ status: 200, contentType: "application/json", body: "[]" }),
+  )
+  await page.routeWebSocket("wss://stream.binance.com:9443/**", (ws) => {
+    ws.close()
+  })
+}
+
+async function setupChangelogRoutes(page: Page) {
+  // Intercept /changelog.json and /changelog.archive.json with fixtures
+  await page.route("**/changelog.json", (route) =>
+    route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      body: JSON.stringify(changelogFixture),
+    }),
+  )
+  await page.route("**/changelog.archive.json", (route) =>
+    route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      body: JSON.stringify(archiveFixture),
+    }),
+  )
+}
+
+test.describe("changelog functional E2E", () => {
+  test.beforeEach(async ({ page }) => {
+    await stubExternalNetwork(page)
+    await setupChangelogRoutes(page)
+    // Freeze time for deterministic rendering and timestamps
+    await page.clock.install({ time: new Date("2026-01-01T00:00:00Z") })
+    await page.clock.pauseAt(new Date("2026-01-01T00:00:01Z"))
+  })
+
+  test("land on /changelog and see all releases", async ({ page }) => {
+    await page.goto("/changelog")
+    await page.waitForLoadState("networkidle")
+
+    // Verify page heading is visible
+    const heading = page.getByRole("heading", { name: "Changelog", level: 1 })
+    await expect(heading).toBeVisible()
+
+    // Verify all fixture releases are rendered
+    const v040Section = page.locator("section[id='v0-4-0']")
+    const v032Section = page.locator("section[id='v0-3-2']")
+    const v0100Section = page.locator("section[id='v0-10-0']")
+
+    await expect(v040Section).toBeVisible()
+    await expect(v032Section).toBeVisible()
+    await expect(v0100Section).toBeVisible()
+
+    // Verify release headers show version numbers
+    await expect(v040Section.getByRole("heading", { name: /0\.4\.0/ })).toBeVisible()
+    await expect(v032Section.getByRole("heading", { name: /0\.3\.2/ })).toBeVisible()
+    await expect(v0100Section.getByRole("heading", { name: /0\.10\.0/ })).toBeVisible()
+
+    // Verify entries are present (at least one from each release)
+    // v0.4.0 has "added" entry with "Trigger orders"
+    await expect(
+      page.locator("text=/Trigger orders.*take-profit.*stop-loss/i"),
+    ).toBeVisible()
+
+    // v0.3.2 has "changed" entry with "Gas estimation"
+    await expect(
+      page.locator("text=/Gas estimation.*multi-swap/i"),
+    ).toBeVisible()
+
+    // v0.10.0 has "security" entry with "Session tokens"
+    await expect(page.locator("text=/Session tokens.*rotate/i")).toBeVisible()
+  })
+
+  test("apply category filter and reload, expecting persistence via URL", async ({
+    page,
+  }) => {
+    await page.goto("/changelog")
+    await page.waitForLoadState("networkidle")
+
+    // Click the "fixed" type badge to filter
+    const fixedBadge = page.locator("text='Fixed'")
+    await fixedBadge.click()
+    await page.waitForLoadState("networkidle")
+
+    // Verify URL contains ?type=fixed
+    await expect(page).toHaveURL(/\/changelog\?type=fixed/)
+
+    // Verify only entries with type "fixed" are shown
+    // v0.4.0 has one "fixed" entry about liquidation price
+    await expect(page.locator("text=/Liquidation price line/i")).toBeVisible()
+
+    // v0.3.2 and v0.10.0 should not be visible since they have no "fixed" entries
+    // (v0.3.2 has "changed", v0.10.0 has "security")
+    const v032Section = page.locator("section[id='v0-3-2']")
+    const v0100Section = page.locator("section[id='v0-10-0']")
+    await expect(v032Section).not.toBeVisible()
+    await expect(v0100Section).not.toBeVisible()
+
+    // Reload the page
+    await page.reload()
+    await page.waitForLoadState("networkidle")
+
+    // Verify URL is still /changelog?type=fixed
+    await expect(page).toHaveURL(/\/changelog\?type=fixed/)
+
+    // Verify filter is still applied after reload
+    await expect(page.locator("text=/Liquidation price line/i")).toBeVisible()
+    await expect(v032Section).not.toBeVisible()
+    await expect(v0100Section).not.toBeVisible()
+
+    // Clear the filter by clicking "All" badge
+    const allBadge = page.locator("text='All'").first()
+    await allBadge.click()
+    await page.waitForLoadState("networkidle")
+
+    // Verify URL reverts to /changelog
+    await expect(page).toHaveURL(/\/changelog$/)
+
+    // Verify all releases are visible again
+    const v040Section = page.locator("section[id='v0-4-0']")
+    await expect(v040Section).toBeVisible()
+    await expect(v032Section).toBeVisible()
+    await expect(v0100Section).toBeVisible()
+  })
+
+  test("search and clear with 300ms debounce", async ({ page }) => {
+    await page.goto("/changelog")
+    await page.waitForLoadState("networkidle")
+
+    // Find the search input (placeholder contains "Search")
+    const searchInput = page.locator("input[type='text']").first()
+
+    // Type search term that matches "trigger" (in v0.4.0 entry)
+    await searchInput.fill("trigger")
+
+    // Wait for debounce (300ms in FilterBar) + render
+    await page.waitForTimeout(400)
+
+    // Verify URL contains ?q=trigger
+    await expect(page).toHaveURL(/\/changelog\?q=trigger/)
+
+    // Verify only matching entries are visible
+    // v0.4.0's "Trigger orders" entry should be visible
+    await expect(page.locator("text=/Trigger orders/i")).toBeVisible()
+
+    // v0.3.2 and v0.10.0 have no matches, so their sections should not render
+    const v032Section = page.locator("section[id='v0-3-2']")
+    const v0100Section = page.locator("section[id='v0-10-0']")
+    await expect(v032Section).not.toBeVisible()
+    await expect(v0100Section).not.toBeVisible()
+
+    // Clear the search
+    await searchInput.clear()
+    await page.waitForTimeout(400)
+
+    // Verify URL reverts to /changelog
+    await expect(page).toHaveURL(/\/changelog$/)
+
+    // Verify all releases are visible again
+    const v040Section = page.locator("section[id='v0-4-0']")
+    await expect(v040Section).toBeVisible()
+    await expect(v032Section).toBeVisible()
+    await expect(v0100Section).toBeVisible()
+  })
+
+  test("deep-link to archived version and scroll into view", async ({ page }) => {
+    // Navigate directly to a version anchor that exists in the archive
+    // v0.1.0 is not in recent releases, so must be fetched from archive
+    await page.goto("/changelog#v0-1-0")
+    await page.waitForLoadState("networkidle")
+
+    // Verify URL hash is preserved
+    await expect(page).toHaveURL(/\/changelog#v0-1-0$/)
+
+    // Verify page heading is visible
+    const heading = page.getByRole("heading", { name: "Changelog", level: 1 })
+    await expect(heading).toBeVisible()
+
+    // Verify the archived version section exists and is visible
+    const archivedSection = page.locator("section[id='v0-1-0']")
+    await expect(archivedSection).toBeVisible()
+
+    // Verify the section header shows the version
+    await expect(
+      archivedSection.getByRole("heading", { name: /0\.1\.0/ }),
+    ).toBeVisible()
+
+    // Verify the entry from archive is visible
+    await expect(
+      page.locator("text=/First public release/i"),
+    ).toBeVisible()
+
+    // Verify recent releases are also rendered (archive is appended, not replaced)
+    const v040Section = page.locator("section[id='v0-4-0']")
+    await expect(v040Section).toBeVisible()
+  })
+
+  test("copy permalink to clipboard", async ({ page }) => {
+    await page.goto("/changelog")
+    await page.waitForLoadState("networkidle")
+
+    // Set up clipboard mock inside the page context before any code runs
+    await page.evaluate(() => {
+      ;(window as any).__clipboardContent = ""
+      Object.defineProperty(navigator.clipboard, "writeText", {
+        value: async (text: string) => {
+          ;(window as any).__clipboardContent = text
+          return Promise.resolve()
+        },
+        configurable: true,
+      })
+    })
+
+    // Find a copy button in the v0.4.0 section
+    const v040Section = page.locator("section[id='v0-4-0']")
+    const copyButton = v040Section.getByRole("button", { name: /copy/i }).first()
+
+    await expect(copyButton).toBeVisible()
+    await copyButton.click()
+
+    // Wait for clipboard operation to complete
+    await page.waitForTimeout(150)
+
+    // Read what was written to clipboard
+    const clipboard = await page.evaluate(() => {
+      return (window as any).__clipboardContent
+    })
+
+    // Verify clipboard contains the full URL with hash anchor
+    // Format should be like: https://so4.market/changelog#v0-4-0
+    // or http://127.0.0.1:3000/changelog#v0-4-0 in test environment
+    expect(clipboard).toMatch(/changelog#v0-4-0/)
+  })
+
+  test("navbar indicator appears with unseen version and clears after visit", async ({
+    page,
+  }) => {
+    // Seed localStorage with an older seen version (0.3.2)
+    // Newest in fixture is 0.4.0, which is a minor bump → should show indicator
+    await page.addInitScript(() => {
+      localStorage.setItem("so4:changelog:seen", "0.3.2")
+    })
+
+    // Navigate to /trade which loads the navbar with WhatsNewDot
+    await page.goto("/trade")
+    await page.waitForLoadState("networkidle")
+
+    // The navbar should have a changelog link with the indicator dot visible
+    // WhatsNewDot is aria-hidden with data-slot="whats-new-dot"
+    const whatsNewDot = page.locator('[data-slot="whats-new-dot"]')
+    await expect(whatsNewDot).toBeVisible()
+
+    // Click the changelog link in the navbar to navigate to /changelog
+    const changelogLink = page.getByRole("link", { name: /Changelog/ })
+    await changelogLink.click()
+    await page.waitForLoadState("networkidle")
+
+    // On /changelog, the newest version (0.4.0) is written to localStorage
+    // after the page loads (in ChangelogPage effect)
+    await page.waitForTimeout(200)
+
+    // Navigate back to /trade to check if indicator is now gone
+    await page.goto("/trade")
+    await page.waitForLoadState("networkidle")
+
+    // The dot should not be visible since localStorage now has "0.4.0"
+    // matching the newest release
+    await expect(whatsNewDot).not.toBeVisible()
+  })
+
+  test("navbar indicator does not show for patch-only bumps", async ({ page }) => {
+    // Seed localStorage with 0.4.0 (patch bump to 0.4.1 should not show)
+    // But our fixture doesn't have 0.4.1, so we test with current version
+    // Set seen to 0.4.0, newest is also 0.4.0 → no bump → no indicator
+    await page.addInitScript(() => {
+      localStorage.setItem("so4:changelog:seen", "0.4.0")
+    })
+
+    await page.goto("/trade")
+    await page.waitForLoadState("networkidle")
+
+    const whatsNewDot = page.locator('[data-slot="whats-new-dot"]')
+    await expect(whatsNewDot).not.toBeVisible()
+  })
+
+  test("archive loads on demand for deep-linked archived versions", async ({
+    page,
+  }) => {
+    // This test verifies that the archive is only fetched when needed
+    // (not on initial /changelog load)
+
+    // First load: navigate to /changelog (recent only)
+    let archiveRequested = false
+    await page.on("response", (response) => {
+      if (response.url().includes("changelog.archive.json")) {
+        archiveRequested = true
+      }
+    })
+
+    await page.goto("/changelog")
+    await page.waitForLoadState("networkidle")
+
+    // Archive should NOT have been requested yet
+    expect(archiveRequested).toBe(false)
+
+    // Now navigate to an archived version deep-link in the same page session
+    // (without clearing the route listener)
+    archiveRequested = false
+    await page.goto("/changelog#v0-1-0")
+    await page.waitForLoadState("networkidle")
+
+    // Archive should NOW be requested because the anchor is not in recent releases
+    expect(archiveRequested).toBe(true)
+
+    // Verify archived version is visible
+    const archivedSection = page.locator("section[id='v0-1-0']")
+    await expect(archivedSection).toBeVisible()
+  })
+})