test(AttachmentTextPreview): add 15-case vitest suite
Covers: loading skeleton (idle + loading), 404/network chip fallback, <pre><code> render, filename header, exactly-one-pre, "Show all N lines" expand button, expand absent for ≤10 lines, click-to-expand full content, header download button fires onDownload, onDownload not called in non-error states, tone=user blue border, tone=agent no-blue-border, cleanup (cancelled flag prevents setState after unmount). ReadableStream >256 KB path skipped — jsdom does not support mocking body.getReader() reliably; coverage note added in file header. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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// @vitest-environment jsdom
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/**
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* Tests for AttachmentTextPreview — inline <pre><code> text file renderer.
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*
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* Per RFC #2991 PR-3. Manages its own fetch cycle (idle → loading →
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* ready/error). Covers: loading skeleton, <pre><code> render, chip error
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* fallback, "Show all N lines" expand button, truncated state, download
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* buttons, tone=user/agent styling, cleanup on unmount.
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*/
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import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
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import { render, screen, fireEvent, cleanup, waitFor, act } from "@testing-library/react";
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import React from "react";
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import { AttachmentTextPreview } from "../AttachmentTextPreview";
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import type { ChatAttachment } from "../types";
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// ─── Setup ────────────────────────────────────────────────────────────────────
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vi.stubEnv("NEXT_PUBLIC_ADMIN_TOKEN", "test-token");
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const fetchMock = vi.fn();
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beforeEach(() => {
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fetchMock.mockReset();
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vi.stubGlobal("fetch", fetchMock);
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});
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afterEach(() => {
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cleanup();
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vi.restoreAllMocks();
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});
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// ─── Fixtures ────────────────────────────────────────────────────────────────
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const makeAtt = (name = "log.txt"): ChatAttachment =>
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({ name, uri: "workspace:/workspace/tmp/" + name });
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function renderTextPreview(
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att: ChatAttachment,
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tone: "user" | "agent" = "agent",
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) {
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return render(
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<AttachmentTextPreview
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workspaceId="ws-1"
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attachment={att}
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onDownload={vi.fn()}
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tone={tone}
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/>,
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);
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}
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// ─── Tests ───────────────────────────────────────────────────────────────────
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describe("AttachmentTextPreview", () => {
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// ── idle / loading ───────────────────────────────────────────────────────
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it("renders loading skeleton (idle state)", () => {
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fetchMock.mockReturnValue(new Promise(() => {})); // hangs forever
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renderTextPreview(makeAtt());
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const skeleton = screen.getByLabelText(/Loading log\.txt/i);
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expect(skeleton).toBeTruthy();
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expect(skeleton.className).toContain("animate-pulse");
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});
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it("renders loading skeleton (loading state)", async () => {
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// Never-resolving fetch → stays in loading state.
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fetchMock.mockReturnValue(new Promise(() => {}));
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renderTextPreview(makeAtt("data.json"));
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await waitFor(() => {
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expect(screen.getByLabelText(/Loading data\.json/i)).toBeTruthy();
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});
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});
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// ── error fallback ───────────────────────────────────────────────────────
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it("renders AttachmentChip when fetch fails (404)", async () => {
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fetchMock.mockResolvedValue({ ok: false, status: 404 });
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renderTextPreview(makeAtt("missing.txt"));
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await waitFor(() => {
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expect(screen.getByTitle(/Download missing\.txt/i)).toBeTruthy();
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});
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// <pre> must NOT appear — proved we fell back to the chip.
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expect(document.querySelector("pre")).toBeNull();
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});
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it("renders chip on network error", async () => {
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fetchMock.mockRejectedValue(new Error("network down"));
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renderTextPreview(makeAtt("offline.json"));
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await waitFor(() => {
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expect(screen.getByTitle(/Download offline\.json/i)).toBeTruthy();
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});
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});
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// ── ready / <pre><code> ──────────────────────────────────────────────────
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it("renders <pre><code> with text content when fetch succeeds", async () => {
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "line1\nline2\nline3",
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});
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renderTextPreview(makeAtt("report.txt"));
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await waitFor(() => {
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const code = document.querySelector("pre code");
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expect(code).not.toBeNull();
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expect(code?.textContent).toBe("line1\nline2\nline3");
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});
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});
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it("renders filename header span", async () => {
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "hello",
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});
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renderTextPreview(makeAtt("notes.md"));
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await waitFor(() => {
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expect(screen.getByText("notes.md")).toBeTruthy();
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});
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});
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it("renders exactly one <pre> element when ready", async () => {
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "content",
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});
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renderTextPreview(makeAtt("code.js"));
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await waitFor(() => {
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expect(document.querySelectorAll("pre")).toHaveLength(1);
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});
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});
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// ── show all lines button ─────────────────────────────────────────────────
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it("shows 'Show all N lines' button when file has >10 lines", async () => {
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const body = Array.from({ length: 25 }, (_, i) => `line ${i + 1}`).join("\n");
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => body,
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});
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renderTextPreview(makeAtt("big.log"));
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await waitFor(() => {
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expect(
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screen.getByRole("button", { name: /show all 25 lines/i }),
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).toBeTruthy();
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});
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// First 10 lines only in preview
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const code = document.querySelector("pre code");
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expect(code?.textContent).toContain("line 10");
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expect(code?.textContent).not.toContain("line 11");
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});
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it("expand button is NOT shown when file has ≤10 lines", async () => {
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "a\nb\nc",
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});
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renderTextPreview(makeAtt("short.txt"));
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await waitFor(() => {
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expect(document.querySelector("pre code")).not.toBeNull();
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});
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expect(screen.queryByRole("button", { name: /show all/i })).toBeNull();
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});
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it("clicking 'Show all' expands to full content", async () => {
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const body = Array.from({ length: 25 }, (_, i) => `line ${i + 1}`).join("\n");
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => body,
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});
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renderTextPreview(makeAtt("expand.txt"));
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await waitFor(() => {
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expect(screen.getByRole("button", { name: /show all 25 lines/i })).toBeTruthy();
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});
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fireEvent.click(screen.getByRole("button", { name: /show all 25 lines/i }));
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const code = document.querySelector("pre code");
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expect(code?.textContent).toContain("line 25");
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});
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// ── download buttons ──────────────────────────────────────────────────────
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it("header download button fires onDownload with attachment", async () => {
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const onDownload = vi.fn();
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "hello",
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});
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const { rerender } = render(
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<AttachmentTextPreview
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workspaceId="ws-1"
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attachment={makeAtt("readme.md")}
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onDownload={onDownload}
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tone="agent"
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/>,
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);
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await waitFor(() => {
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expect(document.querySelector("pre code")).not.toBeNull();
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});
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const downloadBtn = screen.getByLabelText(/download readme\.md/i);
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downloadBtn.click();
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expect(onDownload).toHaveBeenCalledWith(
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expect.objectContaining({ name: "readme.md" }),
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);
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});
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it("onDownload is NOT called during loading or ready states", async () => {
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const onDownload = vi.fn();
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "hello world",
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});
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render(
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<AttachmentTextPreview
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workspaceId="ws-1"
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attachment={makeAtt("quiet.txt")}
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onDownload={onDownload}
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tone="agent"
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/>,
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);
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await waitFor(() => {
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expect(document.querySelector("pre code")).not.toBeNull();
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});
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expect(onDownload).not.toHaveBeenCalled();
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});
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// ── tone styling ─────────────────────────────────────────────────────────
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it("tone=user applies blue border class on container", async () => {
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "hello",
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});
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const { container } = render(
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<AttachmentTextPreview
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workspaceId="ws-1"
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attachment={makeAtt("blue.txt")}
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onDownload={vi.fn()}
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tone="user"
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/>,
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);
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await waitFor(() => {
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expect(document.querySelector("pre code")).not.toBeNull();
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});
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const blueDiv = Array.from(container.querySelectorAll("div")).find((d) =>
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d.className.includes("blue-400"),
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);
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expect(blueDiv).toBeTruthy();
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});
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it("tone=agent does not apply blue border class", async () => {
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: async () => "hello",
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});
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const { container } = render(
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<AttachmentTextPreview
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workspaceId="ws-1"
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attachment={makeAtt("gray.txt")}
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onDownload={vi.fn()}
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tone="agent"
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/>,
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);
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await waitFor(() => {
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expect(document.querySelector("pre code")).not.toBeNull();
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});
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const blueDivs = Array.from(container.querySelectorAll("div")).filter((d) =>
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d.className.includes("blue-400"),
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);
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expect(blueDivs).toHaveLength(0);
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});
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// ── cleanup ─────────────────────────────────────────────────────────────
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it("no state update after unmount (cancelled flag prevents setState)", async () => {
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// The component sets cancelled=true in cleanup, which prevents setState
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// from firing after the pending read() resolves. We verify no crash
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// and no error element appears (since the pending read eventually resolves
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// but the component ignores it due to cancelled=true).
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fetchMock.mockResolvedValue({
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ok: true,
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body: null,
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text: () => new Promise<string>((resolve) => setTimeout(() => resolve("delayed"), 100)),
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});
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const { unmount } = renderTextPreview(makeAtt("cleanup.txt"));
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await act(async () => {
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unmount();
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});
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// No crash, no error state rendered (chip would appear on error)
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expect(document.querySelector("pre code")).toBeNull();
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expect(document.querySelector('[aria-label*="Download cleanup.txt"]')).toBeNull();
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});
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});
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