test: add base unit tests (#32)

Author: DakEnviy

jest.config.js

@@ -1,7 +1,9 @@
 module.exports = {
     roots: ['<rootDir>/src'],
-    testMatch: ['**/__tests__/*.test.ts'],
+    testMatch: ['**/__tests__/*.test.ts{,x}'],
     transform: {
         '^.+\\.tsx?$': '@swc/jest',
     },
+    testEnvironment: 'jsdom',
+    setupFilesAfterEnv: ['<rootDir>/src/setupTests.ts'],
 };