diff --git a/test/default/aead_aes256gcm.c b/test/default/aead_aes256gcm.c
index cc1ba3f5..94c9a3e1 100644
--- a/test/default/aead_aes256gcm.c
+++ b/test/default/aead_aes256gcm.c
@@ -3185,6 +3185,11 @@ tv(void)
             printf("Verification of test vector #%u with a truncated tag failed\n",
                    (unsigned int) i);
         }
+        if (i == 0 && crypto_aead_aes256gcm_decrypt(NULL, NULL,
+                                                    NULL, ciphertext, ciphertext_len,
+                                                    ad, ad_len, nonce, key) != 0) {
+            printf("Verification of test vector #%u's tag failed\n", (unsigned int) i);
+        }
         if (crypto_aead_aes256gcm_decrypt(decrypted, &found_message_len,
                                           NULL, ciphertext, ciphertext_len,
                                           ad, ad_len, nonce, key) != 0) {
diff --git a/test/default/aead_chacha20poly1305.c b/test/default/aead_chacha20poly1305.c
index 8d1b3aae..4f867579 100644
--- a/test/default/aead_chacha20poly1305.c
+++ b/test/default/aead_chacha20poly1305.c
@@ -66,6 +66,10 @@ tv(void)
         printf("m != m2\n");
     }
     memset(m2, 0, m2len);
+    assert(crypto_aead_chacha20poly1305_decrypt_detached(NULL, NULL,
+                                                         c, MLEN, mac,
+                                                         ad, ADLEN,
+                                                         nonce, firstkey) == 0);
     if (crypto_aead_chacha20poly1305_decrypt_detached(m2, NULL,
                                                       c, MLEN, mac,
                                                       ad, ADLEN,
@@ -239,6 +243,10 @@ tv_ietf(void)
         printf("m != m2\n");
     }
     memset(m2, 0, m2len);
+    assert(crypto_aead_chacha20poly1305_ietf_decrypt_detached(NULL, NULL,
+                                                              c, MLEN, mac,
+                                                              ad, ADLEN,
+                                                              nonce, firstkey) == 0);
     if (crypto_aead_chacha20poly1305_ietf_decrypt_detached(m2, NULL,
                                                            c, MLEN, mac,
                                                            ad, ADLEN,
diff --git a/test/default/misuse.c b/test/default/misuse.c
index d06c8f6a..0a08cd91 100644
--- a/test/default/misuse.c
+++ b/test/default/misuse.c
@@ -5,12 +5,32 @@
 #include <signal.h>
 
 static void
-sigabrt_handler_3(int sig)
+sigabrt_handler_5(int sig)
 {
     (void) sig;
     exit(0);
 }
 
+static void
+sigabrt_handler_4(int sig)
+{
+    (void) sig;
+    signal(SIGABRT, sigabrt_handler_5);
+    assert(crypto_aead_chacha20poly1305_ietf_encrypt(NULL, NULL, NULL, UINT64_MAX,
+                                                     NULL, 0, NULL, NULL, NULL) == -1);
+    exit(1);
+}
+
+static void
+sigabrt_handler_3(int sig)
+{
+    (void) sig;
+    signal(SIGABRT, sigabrt_handler_4);
+    assert(crypto_aead_chacha20poly1305_encrypt(NULL, NULL, NULL, UINT64_MAX,
+                                                NULL, 0, NULL, NULL, NULL) == -1);
+    exit(1);
+}
+
 static void
 sigabrt_handler_2(int sig)
 {