import { describe, expect, it } from "vitest"; import {  createInitialDesktopUpdateState,  reduceDesktopUpdateStateOnCheckFailure,  reduceDesktopUpdateStateOnCheckStart,  reduceDesktopUpdateStateOnDownloadComplete,  reduceDesktopUpdateStateOnDownloadFailure,  reduceDesktopUpdateStateOnDownloadProgress,  reduceDesktopUpdateStateOnDownloadStart,  reduceDesktopUpdateStateOnInstallFailure,  reduceDesktopUpdateStateOnNoUpdate,  reduceDesktopUpdateStateOnUpdateAvailable,} from "./updateMachine.ts"; const runtimeInfo = {  hostArch: "x64",  appArch: "x64",  runningUnderArm64Translation: false,} as const; describe("updateMachine", () => {  it("clears transient errors when a check starts", () => {    const state = reduceDesktopUpdateStateOnCheckStart(      {        ...createInitialDesktopUpdateState("1.0.0", runtimeInfo, "latest"),        enabled: true,        status: "error",        message: "network",        errorContext: "check",        canRetry: true,      },      "2026-03-04T00:00:00.000Z",    );     expect(state.status).toBe("checking");    expect(state.message).toBeNull();    expect(state.errorContext).toBeNull();    expect(state.canRetry).toBe(false);  });   it("records a check failure without exposing an action", () => {    const state = reduceDesktopUpdateStateOnCheckFailure(      {        ...createInitialDesktopUpdateState("1.0.0", runtimeInfo, "latest"),        enabled: true,        status: "checking",      },      "network unavailable",      "2026-03-04T00:00:00.000Z",    );     expect(state.status).toBe("error");    expect(state.errorContext).toBe("check");    expect(state.canRetry).toBe(true);  });   it("preserves available version on download failure for retry", () => {    const state = reduceDesktopUpdateStateOnDownloadFailure(      {        ...createInitialDesktopUpdateState("1.0.0", runtimeInfo, "latest"),        enabled: true,        status: "downloading",        availableVersion: "1.1.0",        downloadPercent: 43,      },      "checksum mismatch",    );     expect(state.status).toBe("available");    expect(state.availableVersion).toBe("1.1.0");    expect(state.errorContext).toBe("download");    expect(state.canRetry).toBe(true);  });   it("transitions to downloaded and then preserves install retry state", () => {    const downloaded = reduceDesktopUpdateStateOnDownloadComplete(      {        ...createInitialDesktopUpdateState("1.0.0", runtimeInfo, "latest"),        enabled: true,        status: "downloading",        availableVersion: "1.1.0",      },      "1.1.0",    );    const failedInstall = reduceDesktopUpdateStateOnInstallFailure(      downloaded,      "backend shutdown timed out",    );     expect(downloaded.status).toBe("downloaded");    expect(downloaded.downloadedVersion).toBe("1.1.0");    expect(failedInstall.status).toBe("downloaded");    expect(failedInstall.errorContext).toBe("install");    expect(failedInstall.canRetry).toBe(true);  });   it("clears stale download state when no update is available", () => {    const state = reduceDesktopUpdateStateOnNoUpdate(      {        ...createInitialDesktopUpdateState("1.0.0", runtimeInfo, "latest"),        enabled: true,        status: "error",        availableVersion: "1.1.0",        downloadedVersion: "1.1.0",        message: "old failure",        errorContext: "download",        canRetry: true,      },      "2026-03-04T00:00:00.000Z",    );     expect(state.status).toBe("up-to-date");    expect(state.availableVersion).toBeNull();    expect(state.downloadedVersion).toBeNull();    expect(state.message).toBeNull();    expect(state.errorContext).toBeNull();  });   it("tracks available, download start, and progress cleanly", () => {    const available = reduceDesktopUpdateStateOnUpdateAvailable(      {        ...createInitialDesktopUpdateState("1.0.0", runtimeInfo, "latest"),        enabled: true,        status: "checking",      },      "1.1.0",      "2026-03-04T00:00:00.000Z",    );    const downloading = reduceDesktopUpdateStateOnDownloadStart(available);    const progress = reduceDesktopUpdateStateOnDownloadProgress(downloading, 55.5);     expect(available.status).toBe("available");    expect(available.channel).toBe("latest");    expect(downloading.status).toBe("downloading");    expect(downloading.downloadPercent).toBe(0);    expect(progress.downloadPercent).toBe(55.5);    expect(progress.errorContext).toBeNull();  });});