refactor: replace jest with vitest

jest.config.js

@@ -1,13 +0,0 @@
-module.exports = {
-  preset: "ts-jest",
-  testEnvironment: "node",
-  roots: ["<rootDir>/src"],
-  testMatch: ["**/*.spec.ts"],
-  moduleNameMapper: {
-    "^@actions/core$": "<rootDir>/src/__mocks__/actions-core.ts",
-  },
-  transform: {
-    "^.+\\.ts$": "ts-jest",
-  },
-  moduleFileExtensions: ["ts", "js", "json"],
-};

package.json

@@ -5,20 +5,19 @@
   "scripts": {
     "typecheck": "tsc --noEmit",
     "build": "rolldown -c",
-    "test": "jest",
+    "test": "vitest",
     "format": "oxfmt --write src/**/*.ts"
   },
   "author": "Timo Behrendt <t.behrendt@t00n.de>",
   "license": "MIT",
   "devDependencies": {
     "@types/conventional-commits-parser": "5.0.2",
-    "@types/jest": "30.0.0",
     "@types/node": "24.13.2",
-    "jest": "30.4.2",
+    "@vitest/coverage-v8": "4.1.10",
     "oxfmt": "0.59.0",
     "rolldown": "1.2.0",
-    "ts-jest": "29.4.11",
-    "typescript": "5.9.3"
+    "typescript": "5.9.3",
+    "vitest": "4.1.10"
   },
   "dependencies": {
     "@actions/core": "3.0.1",

src/__mocks__/actions-core.ts

@@ -1,5 +0,0 @@
-export const getInput = jest.fn(() => "");
-export const info = jest.fn();
-export const warning = jest.fn();
-export const setOutput = jest.fn();
-export const setFailed = jest.fn();

src/main.spec.ts

@@ -1,22 +1,24 @@
+import { afterEach, beforeEach, describe, expect, it, vi, type MockedFunction } from "vitest";
+
 import {
-  IncrementType,
-  Tag,
-  GitService,
-  CoreService,
   ConventionalCommitAnalyzer,
-  TagService,
-  TagIncrementer,
-  LocalGitService,
+  CoreService,
+  GitService,
+  IncrementType,
   LocalCoreService,
+  LocalGitService,
+  Tag,
+  TagIncrementer,
+  TagService,
 } from "./main";
 
 // Mock child_process.execSync
-jest.mock("child_process", () => ({
-  execSync: jest.fn(),
+vi.mock("child_process", () => ({
+  execSync: vi.fn(),
 }));
 
 import { execSync } from "child_process";
-const mockExecSync = execSync as jest.MockedFunction<typeof execSync>;
+const mockExecSync = execSync as MockedFunction<typeof execSync>;
 
 // Mock interfaces for testing
 class MockGitService implements GitService {
@@ -439,8 +441,6 @@ describe("LocalCoreService", () => {
     localCoreService = new LocalCoreService();
   });
 
-  // @actions/core is mocked via jest.config.js moduleNameMapper
-
   it("should have all required methods", () => {
     expect(typeof localCoreService.getInput).toBe("function");
     expect(typeof localCoreService.info).toBe("function");

vitest.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "node",
+    include: ["src/**/*.{spec,test}.ts"],
+    coverage: {
+      enabled: true,
+      provider: "v8",
+      include: ["src/**/*.ts"],
+      exclude: ["src/**/*.{spec,test}.ts"],
+      reporter: ["lcov"],
+      reportsDirectory: "coverage",
+    },
+  },
+});