chore: add test script and initial sanity test

Author: wiktoriavh

package.json

@@ -12,7 +12,8 @@
 		"lint:fix": "biome lint --fix .",
 		"format": "biome format --write .",
 		"check": "biome check .",
-		"check:fix": "biome check --write ."
+		"check:fix": "biome check --write .",
+		"test": "node --test"
 	},
 	"keywords": [],
 	"author": "",

test/sanity.test.mjs

@@ -0,0 +1,7 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+test('sanity: 1 + 1 equals 2', () => {
+  assert.equal(1 + 1, 2);
+});
+