From 5438e6c708143fb8055862aa1f07a5e9c29aa984 Mon Sep 17 00:00:00 2001
From: Marek Urbaniak <8502071+marekoid@users.noreply.github.com>
Date: Mon, 30 Mar 2020 16:21:22 +0100
Subject: [PATCH] Add a test for crypto authenticity failure

---
 .../client/crypto/nacl/SecretBoxOpenerTest.java  | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/test/java/com/pusher/client/crypto/nacl/SecretBoxOpenerTest.java b/src/test/java/com/pusher/client/crypto/nacl/SecretBoxOpenerTest.java
index e234ed6a..5b02c3b7 100644
--- a/src/test/java/com/pusher/client/crypto/nacl/SecretBoxOpenerTest.java
+++ b/src/test/java/com/pusher/client/crypto/nacl/SecretBoxOpenerTest.java
@@ -1,6 +1,7 @@
 package com.pusher.client.crypto.nacl;
 
 import static com.google.common.truth.Truth.assertThat;
+import static java.util.Arrays.copyOf;
 
 import com.pusher.client.util.internal.Base64;
 import org.junit.Before;
@@ -9,6 +10,10 @@
 public class SecretBoxOpenerTest {
 
     byte[] key = Base64.decode("6071zp2l/GPnDPDXNWTJDHyIZ8pZMvQrYsa4xuTKK2c=");
+
+    byte[] nonce = Base64.decode("xsbOS0KylAV2ziTDHrP/7rSFqpCOah3p");
+    byte[] cipher = Base64.decode("tvttPE2PRQp0bWDmaPyiEU8YJGztmTvTN77OoPwftTNTdDgJXwxHQPE=");
+
     SecretBoxOpener subject;
 
     @Before
@@ -18,11 +23,16 @@ public void setUp() {
 
     @Test
     public void open() {
-        byte[] cipher = Base64.decode("tvttPE2PRQp0bWDmaPyiEU8YJGztmTvTN77OoPwftTNTdDgJXwxHQPE=");
-        byte[] nonce = Base64.decode("xsbOS0KylAV2ziTDHrP/7rSFqpCOah3p");
-
         byte[] clearText = subject.open(cipher, nonce);
 
         assertThat(new String(clearText)).isEqualTo("{\"message\":\"hello world\"}");
     }
+
+    @Test(expected = AuthenticityException.class)
+    public void openFailsForTamperedCipher() {
+        byte[] tamperedCipher = copyOf(cipher, cipher.length);
+        tamperedCipher[0] ^= tamperedCipher[0];
+
+        subject.open(tamperedCipher, nonce);
+    }
 }
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