chore: add unit test framework

Author: blva

jest.config.js

@@ -0,0 +1,16 @@
+export default {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  extensionsToTreatAsEsm: ['.ts'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
+  transform: {
+    '^.+\\.(ts|tsx)$': ['ts-jest', {
+      useESM: true,
+    }],
+  },
+  testMatch: [
+    '**/tests/**/*.test.ts',
+  ],
+};