fix(FN-1473): recover no-progress task_done failures

packages/dashboard/src/__tests__/debug-execfile.test.ts

@@ -0,0 +1,117 @@
+import { describe, it, expect, vi, beforeEach, afterEach, beforeAll, afterAll } from "vitest";
+import { EventEmitter } from "node:events";
+import { execSync } from "node:child_process";
+import { mkdirSync, writeFileSync, rmSync } from "node:fs";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+import type { Task } from "@fusion/core";
+
+import { createApiRoutes } from "../routes.js";
+
+class MockStore extends EventEmitter {
+  private tasks = new Map<string, Task>();
+
+  getRootDir(): string { return process.cwd(); }
+  async getTask(id: string): Promise<Task> {
+    const task = this.tasks.get(id);
+    if (!task) throw Object.assign(new Error("Task not found"), { code: "ENOENT" });
+    return task;
+  }
+  addTask(task: Task): void { this.tasks.set(task.id, task); }
+  getMissionStore() { return new EventEmitter(); }
+  async listTasks(): Promise<Task[]> { return []; }
+}
+
+function createTask(overrides: Partial<Task> = {}): Task {
+  return {
+    id: "FN-675", title: "Test task", description: "Test description",
+    column: "in-progress", dependencies: [], steps: [], currentStep: 0, log: [],
+    createdAt: "2026-04-01T00:00:00.000Z", updatedAt: "2026-04-01T00:00:00.000Z",
+    columnMovedAt: "2026-04-01T00:00:00.000Z", worktree: "/tmp/fn-675",
+    ...overrides,
+  };
+}
+
+describe("Session files endpoint", () => {
+  let testWorktree: string;
+  let firstCommit: string;
+
+  beforeAll(() => {
+    // Create a test git repository
+    testWorktree = join(tmpdir(), `fn-test-${Date.now()}`);
+    mkdirSync(testWorktree, { recursive: true });
+
+    // Initialize git repo
+    execSync("git init", { cwd: testWorktree });
+    execSync("git config user.email test@test.com", { cwd: testWorktree });
+    execSync("git config user.name Test", { cwd: testWorktree });
+
+    // Create a commit
+    writeFileSync(join(testWorktree, "test.txt"), "initial content");
+    execSync("git add .", { cwd: testWorktree });
+    execSync("git commit -m 'initial'", { cwd: testWorktree });
+
+    // Get the first commit SHA
+    firstCommit = execSync("git rev-parse HEAD", { cwd: testWorktree }).toString().trim();
+
+    // Create a second commit with changes
+    writeFileSync(join(testWorktree, "changed.txt"), "new content");
+    execSync("git add .", { cwd: testWorktree });
+    execSync("git commit -m 'second commit'", { cwd: testWorktree });
+
+    console.log("Test worktree:", testWorktree);
+    console.log("First commit:", firstCommit);
+  });
+
+  afterAll(() => {
+    // Clean up
+    try {
+      rmSync(testWorktree, { recursive: true, force: true });
+    } catch (e) {
+      // Ignore cleanup errors
+    }
+  });
+
+  beforeEach(() => {
+    vi.useFakeTimers({ toFake: ["Date", "setTimeout", "clearTimeout", "setInterval", "clearInterval"] });
+    vi.setSystemTime(new Date("2026-04-01T12:00:00.000Z"));
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it("endpoint should return files from git using real baseCommitSha", async () => {
+    const store = new MockStore();
+
+    store.addTask(createTask({
+      id: "FN-TEST", title: "Test", description: "Test",
+      column: "in-progress", dependencies: [], steps: [], currentStep: 0, log: [],
+      createdAt: "2026-04-01T00:00:00.000Z", updatedAt: "2026-04-01T00:00:00.000Z",
+      columnMovedAt: "2026-04-01T00:00:00.000Z", worktree: testWorktree, baseCommitSha: firstCommit,
+    }));
+
+    const router = createApiRoutes(store);
+    const layer = (router as any).stack.find(
+      (c: any) => c.route?.path === "/tasks/:id/session-files" && c.route?.methods?.get,
+    );
+
+    const handler = layer.route.stack[layer.route.stack.length - 1].handle;
+
+    const res: any = {
+      statusCode: 200,
+      body: undefined,
+      status(code: number) { this.statusCode = code; return this; },
+      json(payload: any) { this.body = payload; return this; }
+    };
+
+    await handler({ params: { id: "FN-TEST" } }, res);
+
+    console.log("Response body:", res.body);
+
+    expect(res.statusCode).toBe(200);
+    expect(Array.isArray(res.body)).toBe(true);
+    // Should have changed.txt as a changed file
+    expect(res.body).toContain("changed.txt");
+  });
+});