f add test for signing with an invalid keypair

Author: jonasnick

src/modules/schnorrsig/tests_impl.h

@@ -103,6 +103,7 @@ void test_schnorrsig_api(void) {
     unsigned char sk3[32];
     unsigned char msg[32];
     secp256k1_keypair keypairs[3];
+    secp256k1_keypair invalid_keypair = { 0 };
     secp256k1_xonly_pubkey pk[3];
     secp256k1_xonly_pubkey zero_pk;
     unsigned char sig[64];
@@ -149,8 +150,11 @@ void test_schnorrsig_api(void) {
     CHECK(ecount == 4);
     CHECK(secp256k1_schnorrsig_sign(sign, sig, msg, NULL, NULL, NULL) == 0);
     CHECK(ecount == 5);
+    CHECK(secp256k1_schnorrsig_sign(sign, sig, msg, &invalid_keypair, NULL, NULL) == 0);
+    CHECK(ecount == 6);
 
     ecount = 0;
+    CHECK(secp256k1_schnorrsig_sign(sign, sig, msg, &keypairs[0], NULL, NULL) == 1);
     CHECK(secp256k1_schnorrsig_verify(none, sig, msg, &pk[0]) == 0);
     CHECK(ecount == 1);
     CHECK(secp256k1_schnorrsig_verify(sign, sig, msg, &pk[0]) == 0);