diff --git a/test/default/generichash.c b/test/default/generichash.c
index e0599394..62faeb10 100644
--- a/test/default/generichash.c
+++ b/test/default/generichash.c
@@ -22,6 +22,12 @@ int main(void)
         printf("\n");
     }
 
+    assert(crypto_generichash(out, 0U, in, sizeof in, k, sizeof k) == -1);
+    assert(crypto_generichash(out, crypto_generichash_BYTES_MAX + 1U, in, sizeof in,
+                              k, sizeof k) == -1);
+    assert(crypto_generichash(out, sizeof out, in, sizeof in,
+                              k, crypto_generichash_KEYBYTES_MAX + 1U) == -1);
+
     assert(crypto_generichash_bytes_min() > 0U);
     assert(crypto_generichash_bytes_max() > 0U);
     assert(crypto_generichash_bytes() > 0U);
diff --git a/test/default/generichash2.c b/test/default/generichash2.c
index 1f301f48..81480ca9 100644
--- a/test/default/generichash2.c
+++ b/test/default/generichash2.c
@@ -27,5 +27,11 @@ int main(void)
         }
         printf("\n");
     }
+
+    assert(crypto_generichash_init(&st, k, sizeof k, 0U) == -1);
+    assert(crypto_generichash_init(&st, k, sizeof k,
+                                   crypto_generichash_BYTES_MAX + 1U) == -1);
+    assert(crypto_generichash_init(&st, k, crypto_generichash_KEYBYTES_MAX + 1U,
+                                   sizeof out) == -1);
     return 0;
 }
diff --git a/test/default/generichash3.c b/test/default/generichash3.c
index 3c023501..29ffd61e 100644
--- a/test/default/generichash3.c
+++ b/test/default/generichash3.c
@@ -32,5 +32,13 @@ int main(void)
         }
         printf("\n");
     }
+    assert(crypto_generichash_blake2b_init_salt_personal(&st, k, sizeof k, 0U,
+                                                         salt, personal) == -1);
+    assert(crypto_generichash_blake2b_init_salt_personal(&st, k, sizeof k,
+                                                         crypto_generichash_BYTES_MAX + 1U,
+                                                         salt, personal) == -1);
+    assert(crypto_generichash_blake2b_init_salt_personal(&st, k,
+                                                         crypto_generichash_KEYBYTES_MAX + 1U,
+                                                         sizeof out, salt, personal) == -1);
     return 0;
 }