kuber/tests/lib/config.test.ts

import { afterEach, describe, expect, test } from "bun:test";
import { mkdtemp, rm } from "node:fs/promises";
import { join } from "node:path";
import { tmpdir } from "node:os";
import type { V1Deployment } from "@kubernetes/client-node";
import {
  DEFAULT_REGISTRY,
  DEFAULT_ROLLOUT_TIMEOUT_MS,
  extractConfigArgument,
  loadConfig,
  resolveConfigArgument,
} from "../../lib/config";
import { composeToKubernetes } from "../../lib/convert";

const directories: string[] = [];

async function temporaryDirectory() {
  const directory = await mkdtemp(join(tmpdir(), "kuber-config-"));
  directories.push(directory);
  return directory;
}

afterEach(async () => {
  await Promise.all(
    directories
      .splice(0)
      .map((directory) => rm(directory, { recursive: true, force: true })),
  );
});

describe("kuber config", () => {
  test("uses operational defaults when .kuberrc.ts is absent", async () => {
    const cwd = await temporaryDirectory();
    expect(await loadConfig(cwd)).toMatchObject({
      project: cwd.split("/").at(-1),
      registry: DEFAULT_REGISTRY,
      rolloutTimeoutMs: DEFAULT_ROLLOUT_TIMEOUT_MS,
      configFile: undefined,
    });
  });

  test("loads TypeScript from a custom config path", async () => {
    const cwd = await temporaryDirectory();
    const configFile = join(cwd, "production.kuberrc.ts");
    await Bun.write(
      configFile,
      `export default {
        project: "configured-project",
        composeFile: "deploy/compose.yml",
        registry: "registry.example.com/",
        rolloutTimeoutMs: 42_000,
        async preBuild() {},
      };`,
    );

    const config = await loadConfig(cwd, "production.kuberrc.ts");
    expect(config).toMatchObject({
      project: "configured-project",
      composeFile: join(cwd, "deploy", "compose.yml"),
      registry: "registry.example.com",
      rolloutTimeoutMs: 42_000,
      configFile,
    });
    expect(config.preBuild).toBeFunction();
  });

  test("requires explicit config paths to exist", async () => {
    const cwd = await temporaryDirectory();
    await expect(loadConfig(cwd, "missing.ts")).rejects.toThrow(
      "Config file cannot be found",
    );
  });

  test("requires a default object export", async () => {
    const cwd = await temporaryDirectory();
    await Bun.write(join(cwd, ".kuberrc.ts"), "export const project = 'bad';");
    await expect(loadConfig(cwd)).rejects.toThrow(
      "must default export a configuration object",
    );
  });

  test("validates hook and operational values", async () => {
    const cwd = await temporaryDirectory();
    await Bun.write(
      join(cwd, ".kuberrc.ts"),
      "export default { preBuild: true, rolloutTimeoutMs: -1 };",
    );
    await expect(loadConfig(cwd)).rejects.toThrow("preBuild");
  });

  test("uses the configured registry in rendered build images", async () => {
    const resources = await composeToKubernetes(
      "project",
      { services: { app: { build: "." } } },
      process.cwd(),
      {},
      { app: `registry.example.com/team/kuber/project-app:latest@sha256:${"a".repeat(64)}` },
    );
    const deployment = resources.find(
      (resource) => resource.kind === "Deployment",
    ) as V1Deployment | undefined;
    expect(deployment?.spec?.template.spec?.containers[0]?.image).toBe(
      `registry.example.com/team/kuber/project-app:latest@sha256:${"a".repeat(64)}`,
    );
  });
});

describe("global config argument", () => {
  test.each([
    [["--config", "one.ts", "up"], "one.ts"],
    [["up", "--config", "two.ts"], "two.ts"],
    [["--config=three.ts", "up"], "three.ts"],
  ])("reads a config path from %j", (args, expected) => {
    expect(resolveConfigArgument(args)).toBe(expected);
  });

  test("rejects a config option without a path", () => {
    expect(() => resolveConfigArgument(["up", "--config"])).toThrow(
      "requires a path",
    );
  });

  test("does not parse config arguments after --", () => {
    expect(
      resolveConfigArgument(["exec", "app", "--", "--config", "x.ts"]),
    ).toBeUndefined();
  });

  test("removes the global option before subcommand dispatch", () => {
    expect(
      extractConfigArgument(["logs", "--config", "production.ts"]),
    ).toEqual({
      configPath: "production.ts",
      rawArgs: ["logs"],
    });
  });

  test("rejects duplicate config options", () => {
    expect(() =>
      extractConfigArgument(["--config=one.ts", "--config=two.ts"]),
    ).toThrow("only be specified once");
  });
});