add tests

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

tsconfig.json

@@ -1,17 +1,21 @@
 {
   "compilerOptions": {
+    "esModuleInterop": true,
     "target": "es6",
     "module": "commonjs",
+    "strict": true,
     "newLine": "lf",
     "outDir": "./lib",
     "rootDir": "./src",
-    "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
-    "strict": true,
     "noImplicitAny": false,
+    "resolveJsonModule": true,
     "useUnknownInCatchVariables": false,
   },
   "exclude": [
-    "node_modules"
+    "./__tests__/**/*",
+    "./lib/**/*",
+    "node_modules",
+    "jest.config.ts"
   ]
 }