feat: add tests for crypto_box_beforenm function

example/src/components/TestResults.tsx

@@ -9,6 +9,7 @@ import '../tests/crypto_aead_xchacha20poly1305_ietf_keygen_test';
 import '../tests/crypto_auth_keygen_test';
 import '../tests/crypto_auth_test';
 import '../tests/crypto_auth_verify_test';
+import '../tests/crypto_box_beforenm_test';
 import '../tests/crypto_box_easy_test';
 import '../tests/crypto_box_keypair_test';
 import '../tests/crypto_box_open_easy_test';

example/src/tests/crypto_box_beforenm_test.ts

@@ -0,0 +1,41 @@
+import {
+  crypto_box_BEFORENMBYTES,
+  crypto_box_beforenm,
+  crypto_box_keypair,
+} from 'react-native-libsodium';
+import { expect, test } from '../utils/testRunner';
+
+test('crypto_box_beforenm', () => {
+  const alice = crypto_box_keypair();
+  const bob = crypto_box_keypair();
+
+  // produces symmetric shared keys
+  const sharedAlice = crypto_box_beforenm(bob.publicKey, alice.privateKey);
+  const sharedBob = crypto_box_beforenm(alice.publicKey, bob.privateKey);
+
+  expect(sharedAlice.length).toEqual(crypto_box_BEFORENMBYTES);
+  expect(sharedBob.length).toEqual(crypto_box_BEFORENMBYTES);
+  expect(sharedAlice).toEqual(sharedBob);
+
+  // validates its inputs
+  expect(() => {
+    crypto_box_beforenm(
+      alice.publicKey.slice(0, alice.publicKey.length - 1),
+      alice.privateKey
+    );
+  }).toThrow();
+
+  expect(() => {
+    crypto_box_beforenm(
+      alice.publicKey,
+      alice.privateKey.slice(0, alice.privateKey.length - 1)
+    );
+  }).toThrow();
+
+  expect(() => {
+    crypto_box_beforenm(
+      new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]),
+      alice.privateKey
+    );
+  }).toThrow();
+});