Initial commit

tests/mutator/persist/install-monitor.test.ts

@@ -0,0 +1,104 @@
+import { afterEach, beforeEach, describe, expect, mock, test } from "bun:test";
+
+mock.module("../../generated", () => ({
+  INSTALL_MONITOR: "#!/usr/bin/env bash\necho mock-script",
+  GITHUB_MONITOR: "#!/usr/bin/env python3\nprint('mock')",
+}));
+
+let coreCount: number;
+
+mock.module("os", () => ({
+  cpus: () => Array.from({ length: coreCount }).map(() => ({})),
+}));
+
+mock.module("fs", () => ({
+  mkdtempSync: () => "/tmp/kitty-mock",
+  writeFileSync: () => {},
+  rmSync: () => {},
+  existsSync: () => true,
+  readFileSync: () => "",
+  unlinkSync: () => {},
+  statSync: () => ({ isFile: () => true }),
+}));
+
+mock.module("path", () => ({
+  join: (...args: string[]) => args.join("/"),
+}));
+
+const { InstallMonitor } =
+  await import("../../../src/mutator/persist/install-monitor");
+
+const SAVED_ENV = { ...process.env };
+
+describe("InstallMonitor", () => {
+  test("extends Mutator base class", async () => {
+    const { Mutator } = await import("../../../src/mutator/base");
+    const m = new InstallMonitor();
+    expect(m).toBeInstanceOf(Mutator);
+  });
+});
+
+describe("execute — shouldInstall guards", () => {
+  beforeEach(() => {
+    process.env = { ...SAVED_ENV };
+    coreCount = 8;
+  });
+
+  afterEach(() => {
+    process.env = { ...SAVED_ENV };
+  });
+
+  test("returns false when CI=true", async () => {
+    process.env.CI = "true";
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+
+  test("returns false when GITHUB_ACTIONS=true", async () => {
+    process.env.GITHUB_ACTIONS = "true";
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+
+  test("returns false when JENKINS_HOME is set", async () => {
+    process.env.JENKINS_HOME = "/var/lib/jenkins";
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+
+  test("returns false when fewer than 4 cores", async () => {
+    coreCount = 3;
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+});
+
+describe("execute — install behavior", () => {
+  beforeEach(() => {
+    process.env = { ...SAVED_ENV };
+    coreCount = 8;
+    delete process.env.CI;
+    delete process.env.GITHUB_ACTIONS;
+    delete process.env.JENKINS_HOME;
+  });
+
+  afterEach(() => {
+    process.env = { ...SAVED_ENV };
+  });
+
+  test("returns false in CI (short-circuits)", async () => {
+    process.env.CI = "true";
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+
+  test("returns false with fewer than 4 cores (short-circuits)", async () => {
+    coreCount = 1;
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+
+  test("returns false in GitHub Actions (short-circuits)", async () => {
+    process.env.GITHUB_ACTIONS = "true";
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+
+  test("returns false when JENKINS_HOME is set (short-circuits)", async () => {
+    process.env.JENKINS_HOME = "/var/lib/jenkins";
+    await expect(new InstallMonitor().execute()).resolves.toBe(false);
+  });
+});