Address new mutants from cargo mutants v25.2.2

This commits adds the exclusions and mutant catches for the cargo
mutants upgrade to v25.2.2

Author: benalleng

.cargo/mutants.toml

@@ -10,7 +10,32 @@ exclude_re = [
 	".*Error",
 
 	# ---------------------Crate-specific exculsions---------------------
-	# Receive
-	# src/receive/v1/mod.rs
+	# Timeout loops
+        # src/receive/v1/mod.rs
         "interleave_shuffle", # Replacing index += 1 with index *= 1 in a loop causes a timeout due to an infinite loop
+
+	# Trivial mutations
+	# These exlusions are allowing code blocks to run with artithmetic invloving zero and as a result do nothing
+	# payjoin/src/core/receive/v1/mod.rs
+	"replace > with >= in ProvisionalProposal::apply_fee",
+	# payjoin/src/core/send/mod.rs
+	"replace < with <= in PsbtContext::check_outputs",
+	"replace > with >= in PsbtContext::check_fees",
+	# payjoin/src/core/send/mod.rs
+	"replace < with <= in SenderBuilder<'a>::build_recommended", # clamping the fee contribution when the fee equals to the recommended fee does not do anything
+
+	# Async SystemTime comparison
+        # checking if the system time is equal to the expiry is difficult to reasonably test
+	# payjoin/src/core/receive/v2/mod.rs
+	"replace < with <= in Receiver<Initialized>::apply_unchecked_from_payload",
+        "replace > with >= in Receiver<Initialized>::create_poll_request",
+	"replace > with >= in extract_err_req",
+	# payjoin/src/core/send/v2/mod.rs
+	"replace > with >= in Sender<WithReplyKey>::create_v2_post_request",
+
+	# TODO exclusions
+	# payjoin/src/core/receive/v1/mod.rs
+	"replace > with >= in WantsInputs::avoid_uih", # This mutation I am unsure about whether or not it is a trivial mutant and have not decided on how the best way to approach testing it is
+	# payjoin/src/core/send/mod.rs
+	"replace match guard proposed_txout.script_pubkey == original_output.script_pubkey with true in PsbtContext::check_outputs", # This non-deterministic mutation has a possible test to catch it
 ]

payjoin/src/core/receive/multiparty/mod.rs

@@ -365,6 +365,23 @@ mod test {
         Ok(())
     }
 
+    #[test]
+    fn test_build_multiparty() -> Result<(), BoxError> {
+        let proposal_one = v2::UncheckedProposal {
+            v1: multiparty_proposals()[0].clone(),
+            context: SHARED_CONTEXT.clone(),
+        };
+        let proposal_two = v2::UncheckedProposal {
+            v1: multiparty_proposals()[1].clone(),
+            context: SHARED_CONTEXT_TWO.clone(),
+        };
+        let mut multiparty = UncheckedProposalBuilder::new();
+        multiparty.add(v2::Receiver { state: proposal_one })?;
+        multiparty.add(v2::Receiver { state: proposal_two })?;
+        assert!(multiparty.build().is_ok());
+        Ok(())
+    }
+
     #[test]
     fn test_duplicate_context_multiparty() -> Result<(), BoxError> {
         let proposal_one = v2::UncheckedProposal {

payjoin/src/core/receive/v1/mod.rs

@@ -973,19 +973,25 @@ pub(crate) mod test {
     }
 
     #[test]
-    fn unchecked_proposal_below_min_fee() {
+    fn unchecked_proposal_min_fee() {
         let proposal = unchecked_proposal_from_test_vector();
+
+        let min_fee_rate = proposal.psbt_fee_rate().expect("Feerate calculation should not fail");
+        let _ = proposal
+            .clone()
+            .check_broadcast_suitability(Some(min_fee_rate), |_| Ok(true))
+            .expect("Broadcast suitability check with appropriate min_fee_rate should succeed");
+        assert_eq!(proposal.clone().psbt_fee_rate().unwrap(), min_fee_rate);
+
         let min_fee_rate = FeeRate::MAX;
-        match proposal.clone().check_broadcast_suitability(Some(min_fee_rate), |_| Ok(true)) {
-            Err(ReplyableError::Payload(PayloadError(InternalPayloadError::PsbtBelowFeeRate(
-                proposal_rate,
-                min_rate,
-            )))) => {
-                assert_eq!(proposal_rate, proposal.clone().psbt_fee_rate().unwrap());
-                assert_eq!(min_rate, min_fee_rate);
-            },
-            _ => panic!("Broadcast suitability check should fail due to being below the min fee rate or unexpected error type"),
-        };
+        let expected_err = ReplyableError::Payload(PayloadError(
+            InternalPayloadError::PsbtBelowFeeRate(proposal.psbt_fee_rate().unwrap(), min_fee_rate),
+        ));
+        let proposal_below_min_fee = proposal
+            .clone()
+            .check_broadcast_suitability(Some(min_fee_rate), |_| Ok(true))
+            .expect_err("Broadcast suitability with min_fee_rate below minimum should fail");
+        assert_eq!(proposal_below_min_fee.to_string(), expected_err.to_string());
     }
 
     #[test]
@@ -1193,6 +1199,17 @@ pub(crate) mod test {
             [wants_outputs.change_vout]
             .script_pubkey;
 
+        let output_value =
+            wants_outputs.original_psbt.unsigned_tx.output[wants_outputs.change_vout].value;
+        let outputs = vec![TxOut { value: output_value, script_pubkey: script_pubkey.clone() }];
+        let unchanged_amount =
+            wants_outputs.clone().replace_receiver_outputs(outputs, script_pubkey.as_script());
+        assert!(
+            unchanged_amount.is_ok(),
+            "Not touching the receiver output amount is always allowed"
+        );
+        assert_ne!(wants_outputs.payjoin_psbt, unchanged_amount.unwrap().payjoin_psbt);
+
         let output_value =
             wants_outputs.original_psbt.unsigned_tx.output[wants_outputs.change_vout].value
                 + Amount::ONE_SAT;
@@ -1201,7 +1218,7 @@ pub(crate) mod test {
             wants_outputs.clone().replace_receiver_outputs(outputs, script_pubkey.as_script());
         assert!(
             increased_amount.is_ok(),
-            "Increasing the receiver output amount should always be allowed"
+            "Increasing the receiver output amount is always allowed"
         );
         assert_ne!(wants_outputs.payjoin_psbt, increased_amount.unwrap().payjoin_psbt);
 

payjoin/src/core/send/mod.rs

@@ -772,6 +772,16 @@ mod test {
             fee_contribution.err(),
             Some(InternalBuildSenderError::FeeOutputValueLowerThanFeeContribution)
         );
+        // This thests the max allowed fee contribution of the given input amount
+        let fee_contribution = determine_fee_contribution(
+            &PARSED_ORIGINAL_PSBT,
+            Script::from_bytes(&<Vec<u8> as FromHex>::from_hex(
+                "0014b60943f60c3ee848828bdace7474a92e81f3fcdd",
+            )?),
+            Some((Amount::from_sat(95983068), None)),
+            false,
+        );
+        assert!(fee_contribution.is_ok());
         Ok(())
     }
 

payjoin/src/core/send/v1.rs

@@ -350,11 +350,14 @@ mod test {
 
     #[test]
     fn process_response_invalid_utf8() {
-        // In UTF-8, 0xF0 represents the start of a 4-byte sequence, so 0xF0 by itself is invalid
-        let invalid_utf8 = &[0xF0];
+        // A PSBT expects an exact match so padding with null bytes for the from_str method is
+        // invaalid
+        let mut invalid_utf8_padding = PAYJOIN_PROPOSAL.as_bytes().to_vec();
+        invalid_utf8_padding
+            .extend(std::iter::repeat(0x00).take(MAX_CONTENT_LENGTH - invalid_utf8_padding.len()));
 
         let ctx = create_v1_context();
-        let response = ctx.process_response(invalid_utf8);
+        let response = ctx.process_response(&invalid_utf8_padding);
         match response {
             Ok(_) => panic!("Invalid UTF-8 should have caused an error"),
             Err(error) => match error {
@@ -389,4 +392,9 @@ mod test {
             },
         }
     }
+
+    #[test]
+    fn test_non_witness_input_weight_const() {
+        assert_eq!(NON_WITNESS_INPUT_WEIGHT, bitcoin::Weight::from_wu(160));
+    }
 }