feat(KB-651): add task file diffs API
- Add API endpoint to fetch git diffs for tasks in review - Implement file diff routes with support for changed files view - Add comprehensive test suite for file diffs endpoint - Update dashboard API client for diff fetching capabilities
This commit is contained in:
gsxdsm
276
packages/dashboard/src/__tests__/routes-file-diffs.test.ts
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276
packages/dashboard/src/__tests__/routes-file-diffs.test.ts
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import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
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import { EventEmitter, once } from "node:events";
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import http from "node:http";
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import type { Task } from "@fusion/core";
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import { createServer } from "../server.js";
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import * as childProcess from "node:child_process";
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import * as fs from "node:fs";
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vi.mock("node:child_process", async () => {
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const actual = await vi.importActual<typeof import("node:child_process")>("node:child_process");
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return {
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...actual,
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execSync: vi.fn(),
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};
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});
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vi.mock("node:fs", async () => {
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const actual = await vi.importActual<typeof import("node:fs")>("node:fs");
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return {
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...actual,
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existsSync: vi.fn(),
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};
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});
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const mockExecSync = vi.mocked(childProcess.execSync);
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const mockExistsSync = vi.mocked(fs.existsSync);
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class MockStore extends EventEmitter {
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private tasks = new Map<string, Task>();
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getRootDir(): string {
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return process.cwd();
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}
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getMissionStore() {
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return {
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listMissions: vi.fn().mockResolvedValue([]),
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createMission: vi.fn(),
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getMission: vi.fn(),
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updateMission: vi.fn(),
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deleteMission: vi.fn(),
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listTemplates: vi.fn().mockResolvedValue([]),
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createTemplate: vi.fn(),
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getTemplate: vi.fn(),
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updateTemplate: vi.fn(),
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deleteTemplate: vi.fn(),
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instantiateMission: vi.fn(),
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};
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}
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async listTasks(): Promise<Task[]> {
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return Array.from(this.tasks.values());
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}
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async getTask(id: string): Promise<Task> {
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const task = this.tasks.get(id);
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if (!task) {
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const error = Object.assign(new Error("Task not found"), { code: "ENOENT" });
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throw error;
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}
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return task;
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}
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addTask(task: Task): void {
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this.tasks.set(task.id, task);
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}
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}
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function createTask(overrides: Partial<Task> = {}): Task {
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return {
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id: "KB-651",
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title: "Test task",
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description: "Test description",
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column: "in-progress",
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dependencies: [],
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steps: [],
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currentStep: 0,
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log: [],
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createdAt: "2026-04-01T00:00:00.000Z",
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updatedAt: "2026-04-01T00:00:00.000Z",
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columnMovedAt: "2026-04-01T00:00:00.000Z",
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worktree: "/tmp/kb-651",
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baseBranch: "main",
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...overrides,
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};
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}
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async function requestFileDiffs(port: number, taskId = "KB-651"): Promise<{ status: number; body: any }> {
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return await new Promise((resolve, reject) => {
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const req = http.request(
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{
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hostname: "127.0.0.1",
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port,
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path: `/api/tasks/${taskId}/file-diffs`,
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method: "GET",
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},
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(res) => {
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let data = "";
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res.on("data", (chunk) => (data += chunk));
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res.on("end", () => resolve({ status: res.statusCode!, body: JSON.parse(data) }));
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},
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);
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req.on("error", reject);
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req.end();
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});
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}
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describe("GET /api/tasks/:id/file-diffs", () => {
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beforeEach(() => {
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vi.clearAllMocks();
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mockExistsSync.mockImplementation((path) => path === "/tmp/kb-651");
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vi.useFakeTimers();
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vi.setSystemTime(new Date("2026-04-01T12:00:00.000Z"));
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});
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afterEach(() => {
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vi.useRealTimers();
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vi.restoreAllMocks();
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});
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it("returns changed files with per-file diffs and supports rename metadata", async () => {
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const store = new MockStore();
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store.addTask(createTask({ baseBranch: "main" }));
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mockExecSync.mockImplementation((command) => {
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const cmd = String(command);
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if (cmd === "git diff --name-status main...HEAD") {
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return "M\tsrc/updated.ts\nA\tsrc/added.ts\nD\tsrc/deleted.ts\nR100\tsrc/old-name.ts\tsrc/new-name.ts\n" as any;
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}
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if (cmd === "git diff main...HEAD -- \"src/updated.ts\"") {
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return "diff --git a/src/updated.ts b/src/updated.ts\n--- a/src/updated.ts\n+++ b/src/updated.ts\n+hello\n" as any;
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}
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if (cmd === "git diff main...HEAD -- \"src/added.ts\"") {
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return "diff --git a/src/added.ts b/src/added.ts\nnew file mode 100644\n+++ b/src/added.ts\n+added\n" as any;
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}
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if (cmd === "git diff main...HEAD -- \"src/deleted.ts\"") {
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return "diff --git a/src/deleted.ts b/src/deleted.ts\n--- a/src/deleted.ts\n+++ /dev/null\n-deleted\n" as any;
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}
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if (cmd === "git diff main...HEAD -- \"src/new-name.ts\"") {
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return "diff --git a/src/old-name.ts b/src/new-name.ts\nsimilarity index 100%\nrename from src/old-name.ts\nrename to src/new-name.ts\n" as any;
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}
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throw new Error(`Unexpected command: ${cmd}`);
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});
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const app = createServer(store as any);
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const server = app.listen(0);
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await once(server, "listening");
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const port = (server.address() as { port: number }).port;
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const response = await requestFileDiffs(port);
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expect(response.status).toBe(200);
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expect(mockExecSync.mock.calls.map(([cmd]) => String(cmd))).toEqual([
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"git diff --name-status main...HEAD",
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'git diff main...HEAD -- "src/updated.ts"',
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'git diff main...HEAD -- "src/added.ts"',
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'git diff main...HEAD -- "src/deleted.ts"',
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'git diff main...HEAD -- "src/new-name.ts"',
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]);
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expect(response.body).toEqual([
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{ path: "src/updated.ts", status: "modified", diff: expect.stringContaining("+hello") },
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{ path: "src/added.ts", status: "added", diff: expect.stringContaining("+added") },
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{ path: "src/deleted.ts", status: "deleted", diff: expect.stringContaining("-deleted") },
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{
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path: "src/new-name.ts",
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status: "renamed",
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oldPath: "src/old-name.ts",
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diff: expect.stringContaining("rename from src/old-name.ts"),
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},
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]);
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server.close();
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await once(server, "close");
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});
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it("returns empty array when worktree is missing", async () => {
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const store = new MockStore();
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store.addTask(createTask({ worktree: undefined }));
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const app = createServer(store as any);
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const server = app.listen(0);
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await once(server, "listening");
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const port = (server.address() as { port: number }).port;
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const response = await requestFileDiffs(port);
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expect(response.status).toBe(200);
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expect(response.body).toEqual([]);
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expect(mockExecSync).not.toHaveBeenCalled();
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server.close();
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await once(server, "close");
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});
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it("falls back to HEAD diff when base branch diff fails", async () => {
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const store = new MockStore();
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store.addTask(createTask({ baseBranch: "main" }));
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mockExecSync.mockImplementation((command) => {
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const cmd = String(command);
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if (cmd === "git diff --name-status main...HEAD") {
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throw new Error("bad base branch");
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}
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if (cmd === "git diff --name-status HEAD") {
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return "M\tsrc/local.ts\n" as any;
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}
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if (cmd === "git diff HEAD -- \"src/local.ts\"") {
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return "diff --git a/src/local.ts b/src/local.ts\n+local\n" as any;
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}
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throw new Error(`Unexpected command: ${cmd}`);
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});
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const app = createServer(store as any);
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const server = app.listen(0);
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await once(server, "listening");
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const port = (server.address() as { port: number }).port;
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const response = await requestFileDiffs(port);
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expect(response.status).toBe(200);
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expect(mockExecSync.mock.calls.map(([cmd]) => String(cmd))).toEqual([
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"git diff --name-status main...HEAD",
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"git diff --name-status HEAD",
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'git diff HEAD -- "src/local.ts"',
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]);
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expect(response.body).toEqual([{ path: "src/local.ts", status: "modified", diff: expect.stringContaining("+local") }]);
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server.close();
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await once(server, "close");
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});
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it("uses the 10-second cache before recomputing", async () => {
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const store = new MockStore();
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store.addTask(createTask({ baseBranch: "main" }));
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mockExecSync.mockImplementation((command) => {
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const cmd = String(command);
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if (cmd === "git diff --name-status main...HEAD") {
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return "M\tsrc/cached.ts\n" as any;
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}
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if (cmd === "git diff main...HEAD -- \"src/cached.ts\"") {
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return "diff --git a/src/cached.ts b/src/cached.ts\n+cached\n" as any;
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}
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throw new Error(`Unexpected command: ${cmd}`);
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});
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const app = createServer(store as any);
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const server = app.listen(0);
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await once(server, "listening");
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const port = (server.address() as { port: number }).port;
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const first = await requestFileDiffs(port);
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const second = await requestFileDiffs(port);
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expect(first.body).toEqual([{ path: "src/cached.ts", status: "modified", diff: expect.stringContaining("+cached") }]);
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expect(second.body).toEqual([{ path: "src/cached.ts", status: "modified", diff: expect.stringContaining("+cached") }]);
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expect(mockExecSync.mock.calls.map(([cmd]) => String(cmd))).toEqual([
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"git diff --name-status main...HEAD",
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'git diff main...HEAD -- "src/cached.ts"',
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]);
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vi.advanceTimersByTime(10001);
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const third = await requestFileDiffs(port);
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expect(third.body).toEqual([{ path: "src/cached.ts", status: "modified", diff: expect.stringContaining("+cached") }]);
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expect(mockExecSync.mock.calls.map(([cmd]) => String(cmd))).toEqual([
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"git diff --name-status main...HEAD",
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'git diff main...HEAD -- "src/cached.ts"',
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"git diff --name-status main...HEAD",
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'git diff main...HEAD -- "src/cached.ts"',
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]);
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server.close();
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await once(server, "close");
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});
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});
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