tech-log-frontend/tests/unit/application-boundary.test.ts

import { describe, expect, it, vi } from "vitest";

import {
  createApplication,
  type ApplicationOutputPorts,
} from "../../src/application/create-application.ts";
import { createTestApplication } from "../helpers/create-test-application.ts";
import { createProductFeaturesStub, createRuntimeCapabilitiesStub } from "../helpers/runtime-capabilities-stub.ts";

declare module "../../src/application/ports/in/application-api.ts" {
  interface ApplicationFeatureInputs {
    "test-feature": Readonly<{
      run(): "ok";
    }>;
  }
}

describe("application input/output boundary", () => {
  it("exposes intent-oriented input APIs without leaking output ports", async () => {
    const application = createTestApplication();

    expect(Object.keys(application)).toEqual([
      "session",
      "preferences",
      "diagnostics",
      "runtime",
      "recovery",
      "features",
    ]);
    expect(application).not.toHaveProperty("storage");
    expect(application).not.toHaveProperty("telemetry");
    expect(application).not.toHaveProperty("releaseInfo");
    expect(application.features.has("not-installed")).toBe(false);
    expect(() =>
      Reflect.apply(application.features.get, application.features, [
        "not-installed",
      ]),
    ).toThrow("Application feature is not installed");
    await expect(application.runtime.getReleaseSummary()).resolves.toEqual({
      buildId: "test-build",
      releaseId: "test-release",
      configSchemaVersion: "1",
      apiContractVersion: "1",
    });
  });

  it("returns a typed input for an installed generic feature", () => {
    const featureInput = Object.freeze({
      run: () => "ok" as const,
    });
    const application = createTestApplication({
      featureInputs: { "test-feature": featureInput },
    });

    expect(application.features.has("test-feature")).toBe(true);
    expect(application.features.get("test-feature")).toBe(featureInput);
    expect(application.features.get("test-feature").run()).toBe("ok");
  });

  it("uses fake output ports for preference, session, and safe diagnostics flows", async () => {
    const write = vi.fn(() => ({ ok: true as const }));
    const emit = vi.fn();
    const record = vi.fn();
    const subscribe = vi.fn(() => () => {});
    const beginSignIn = vi.fn(async () => {});
    const signOut = vi.fn(async () => {});
    const recover = vi.fn(async () => "restored" as const);
    const ports = {
      session: {
        getState: () => "authenticated" as const,
        subscribe,
        beginSignIn,
        signOut,
        recover,
      },
      preferences: {
        read: () => ({ ok: true as const, value: "dark" }),
        write,
        remove: () => ({ ok: true as const }),
      },
      diagnostics: { record },
      telemetry: { emit },
      releaseInfo: {
        getCurrent: async () => ({
          buildId: "build-a",
          releaseId: "release-a",
          configSchemaVersion: "1",
          apiContractVersion: "1",
          assetManifestHash: "hash-a",
          routeChunks: { "route-home": "assets/home.js" },
        }),
        refresh: async () => ({
          buildId: "build-a",
          releaseId: "release-a",
          configSchemaVersion: "1",
          apiContractVersion: "1",
          assetManifestHash: "hash-a",
          routeChunks: { "route-home": "assets/home.js" },
        }),
      },
      runtimeCapabilities: createRuntimeCapabilitiesStub(),
      productFeatures: createProductFeaturesStub(),
      navigation: { reload: () => {} },
    } satisfies ApplicationOutputPorts;
    const application = createApplication(ports);

    expect(application.session.getSnapshot()).toBe("authenticated");
    const listener = vi.fn();
    expect(application.session.subscribe(listener)).toBeTypeOf("function");
    expect(subscribe).toHaveBeenCalledWith(listener);
    await application.session.beginSignIn("/return");
    expect(beginSignIn).toHaveBeenCalledWith("/return");
    await application.session.signOut();
    expect(signOut).toHaveBeenCalledOnce();
    await expect(application.session.recover()).resolves.toBe("restored");
    expect(application.preferences.getColorScheme()).toBe("dark");
    expect(application.preferences.setColorScheme("light")).toEqual({ ok: true });
    expect(write).toHaveBeenCalledWith("COLOR_SCHEME", "light");

    application.diagnostics.reportRenderFailure({
      routeId: "APP_HOME",
      buildId: "build-a",
      boundaryName: "route",
    });
    expect(record).toHaveBeenCalledWith({
      level: "error",
      eventId: "ui.render.failed",
      context: {
        route_id: "APP_HOME",
        build_id: "build-a",
        component_boundary: "route",
      },
    });
    expect(emit).toHaveBeenCalledWith("ui.render.failed", {
      route_id: "APP_HOME",
      build_id: "build-a",
      component_boundary: "route",
    });
    application.diagnostics.reportRouteChanged({
      routeId: "APP_HOME",
      buildId: "build-a",
    });
    expect(record).toHaveBeenCalledWith({
      level: "info",
      eventId: "route.changed",
      context: { route_id: "APP_HOME", build_id: "build-a" },
    });
  });

  it("does not let a failing diagnostics output escape into presentation", () => {
    const application = createTestApplication({
      diagnostics: {
        record() {
          throw new Error("sink details");
        },
      },
      telemetry: {
        emit() {
          throw new Error("telemetry details");
        },
      },
    });

    expect(() =>
      application.diagnostics.reportRenderFailure({
        routeId: "APP_HOME",
        buildId: "build-a",
        boundaryName: "feature",
      }),
    ).not.toThrow();
  });
});