diff --git a/src/libsodium/crypto_generichash/blake2/ref/blake2b-ref.c b/src/libsodium/crypto_generichash/blake2/ref/blake2b-ref.c
index bffac865..362beb01 100644
--- a/src/libsodium/crypto_generichash/blake2/ref/blake2b-ref.c
+++ b/src/libsodium/crypto_generichash/blake2/ref/blake2b-ref.c
@@ -417,6 +417,7 @@ int blake2b_salt_personal( uint8_t *out, const void *in, const void *key, const
 int
 blake2b_pick_best_implementation(void)
 {
+/* LCOV_EXCL_START */
 #if (defined(HAVE_AVX2INTRIN_H) && defined(HAVE_TMMINTRIN_H) && defined(HAVE_SMMINTRIN_H)) || \
     (defined(_MSC_VER) && (defined(_M_X64) || defined(_M_AMD64)))
   if (sodium_runtime_has_avx2()) {
@@ -441,4 +442,5 @@ blake2b_pick_best_implementation(void)
   blake2b_compress = blake2b_compress_ref;
 
   return 0;
+/* LCOV_EXCL_STOP */
 }
diff --git a/src/libsodium/crypto_pwhash/argon2/argon2-core.c b/src/libsodium/crypto_pwhash/argon2/argon2-core.c
index 84129aa7..4ba2ec53 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2-core.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2-core.c
@@ -547,6 +547,7 @@ int initialize(argon2_instance_t *instance, argon2_context *context) {
 
 int argon2_pick_best_implementation(void)
 {
+/* LCOV_EXCL_START */
 #if (defined(HAVE_EMMINTRIN_H) && defined(HAVE_TMMINTRIN_H)) || \
     (defined(_MSC_VER) && (defined(_M_X64) || defined(_M_AMD64) || defined(_M_IX86)))
     if (sodium_runtime_has_ssse3()) {
@@ -557,4 +558,5 @@ int argon2_pick_best_implementation(void)
     fill_segment = fill_segment_ref;
 
     return 0;
+/* LCOV_EXCL_STOP */
 }
diff --git a/test/default/pwhash.c b/test/default/pwhash.c
index 41eb1e69..7be6f293 100644
--- a/test/default/pwhash.c
+++ b/test/default/pwhash.c
@@ -244,6 +244,29 @@ int main(void)
     assert(crypto_pwhash_memlimit_sensitive() > 0U);
     assert(strcmp(crypto_pwhash_primitive(), "argon2i") == 0);
 
+    assert(crypto_pwhash_opslimit_interactive() == crypto_pwhash_OPSLIMIT_INTERACTIVE);
+    assert(crypto_pwhash_memlimit_interactive() == crypto_pwhash_MEMLIMIT_INTERACTIVE);
+    assert(crypto_pwhash_opslimit_moderate() == crypto_pwhash_OPSLIMIT_MODERATE);
+    assert(crypto_pwhash_memlimit_moderate() == crypto_pwhash_MEMLIMIT_MODERATE);
+    assert(crypto_pwhash_opslimit_sensitive() == crypto_pwhash_OPSLIMIT_SENSITIVE);
+    assert(crypto_pwhash_memlimit_sensitive() == crypto_pwhash_MEMLIMIT_SENSITIVE);
+
+    assert(crypto_pwhash_argon2i_saltbytes() == crypto_pwhash_saltbytes());
+    assert(crypto_pwhash_argon2i_strbytes() == crypto_pwhash_strbytes());
+    assert(strcmp(crypto_pwhash_argon2i_strprefix(), crypto_pwhash_strprefix()) == 0);
+    assert(crypto_pwhash_argon2i_opslimit_interactive() ==
+           crypto_pwhash_opslimit_interactive());
+    assert(crypto_pwhash_argon2i_opslimit_moderate() ==
+           crypto_pwhash_opslimit_moderate());
+    assert(crypto_pwhash_argon2i_opslimit_sensitive() ==
+           crypto_pwhash_opslimit_sensitive());
+    assert(crypto_pwhash_argon2i_memlimit_interactive() ==
+           crypto_pwhash_memlimit_interactive());
+    assert(crypto_pwhash_argon2i_memlimit_moderate() ==
+           crypto_pwhash_memlimit_moderate());
+    assert(crypto_pwhash_argon2i_memlimit_sensitive() ==
+           crypto_pwhash_memlimit_sensitive());
+
     sodium_free(salt);
     sodium_free(str_out);
     sodium_free(str_out2);
diff --git a/test/default/sign.c b/test/default/sign.c
index 944d77ea..eea0c99e 100644
--- a/test/default/sign.c
+++ b/test/default/sign.c
@@ -1181,6 +1181,14 @@ int main(void)
         printf("detached signature verification should have failed\n");
     }
 
+    memset(sig, 0xff, 32);
+    sig[0] = 0xdb;
+    if (crypto_sign_verify_detached(sig,
+                                    (const unsigned char *)test_data[i].m,
+                                    i, pk) != -1) {
+        printf("detached signature verification should have failed\n");
+    }
+
     if (crypto_sign_keypair(pk, sk) != 0) {
         printf("crypto_sign_keypair() failure\n");
     }