test: add unit test and generate snapshot

Author: AdoKevin

.eslintrc.cjs

@@ -11,6 +11,7 @@ module.exports = {
     'test',
     '*.cjs',
     'openapi-ts-request.config.ts',
+    'vitest.config.ts',
   ],
   plugins: [],
   parserOptions: {

package.json

@@ -30,6 +30,7 @@
     "changeset": "changeset",
     "lint": "eslint ./src --report-unused-disable-directives --max-warnings=0",
     "lint:fix": "eslint ./src --report-unused-disable-directives --max-warnings=0 --fix",
+    "test:unit": "vitest",
     "test": "rm -rf ./test/apis/ ./test/mocks && npm run build && cd ./test && node ./test.js && cd ..",
     "test:new": "npm run build && cd ./test && node ./test.js && cd ..",
     "test:windows": "rimraf ./test/apis/ ./test/mocks && npm run build && cd ./test && node ./test.js && cd ..",
@@ -81,8 +82,10 @@
     "husky": "^9.0.11",
     "lint-staged": "^16.0.0",
     "openapi-types": "^12.1.3",
+    "sanitize-filename": "^1.6.3",
     "ts-node": "^10.9.2",
-    "typescript": "5.8.3"
+    "typescript": "5.8.3",
+    "vitest": "^3.2.4"
   },
   "keywords": [
     "openapi",