diff --git a/tests/node/index.mjs b/tests/node/index.mjs
index f6abba40..f872f8f4 100644
--- a/tests/node/index.mjs
+++ b/tests/node/index.mjs
@@ -23,6 +23,7 @@ import "./tests/Dish.mjs";
 import "./tests/NodeDish.mjs";
 import "./tests/Utils.mjs";
 import "./tests/Categories.mjs";
+import "./tests/lib/BigIntUtils.mjs";
 
 const testStatus = {
     allTestsPassing: true,
diff --git a/tests/node/tests/lib/BigIntUtils.mjs b/tests/node/tests/lib/BigIntUtils.mjs
new file mode 100644
index 00000000..1a6b7c0f
--- /dev/null
+++ b/tests/node/tests/lib/BigIntUtils.mjs
@@ -0,0 +1,28 @@
+import TestRegister from "../../../lib/TestRegister.mjs";
+import { parseBigInt, egcd } from "../../../../src/core/lib/BigIntUtils.mjs";
+import it from "../../assertionHandler.mjs";
+import assert from "assert";
+
+TestRegister.addApiTests([
+    it("BigIntUtils: egcd - basic", () => {
+        const a = BigInt("36");
+        const b = BigInt("48");
+        const gcd = BigInt("12");
+        const bezout1 = BigInt("-1");
+        const bezout2 = BigInt("1");
+        assert.deepStrictEqual(egcd(a, b), [gcd, bezout1, bezout2]);
+    }),
+
+    it("BigIntUtils: parseBigInt - basic", () => {
+        const value = parseBigInt("1", "test value");
+
+        assert.deepStrictEqual(value, BigInt("1"));
+    }),
+
+    it("BigIntUtils: parseBigInt - not an int", () => {
+        assert.throws(() => parseBigInt("test", "test value"), {
+            name: "Error",
+            message: "test value must be decimal or hex (0x...)"
+        });
+    }),
+]);