test: Add conditional check for debug_assertions

Adding debug_assertions where the test case panics allows the test suite
to run in release mode successfully.

bitcoin/src/bip152.rs

@@ -489,6 +489,7 @@ mod test {
     }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic] // 'attempt to add with overflow' in consensus_encode()
     fn test_getblocktx_panic_when_encoding_u64_max() {
         serialize(&BlockTransactionsRequest {

bitcoin/src/blockdata/fee_rate.rs

@@ -190,6 +190,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn from_sat_per_vb_unchecked_panic_test() { FeeRate::from_sat_per_vb_unchecked(u64::MAX); }
 

bitcoin/src/blockdata/weight.rs

@@ -182,6 +182,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn from_vb_unchecked_panic() { Weight::from_vb_unchecked(u64::MAX); }
 

bitcoin/src/pow.rs

@@ -1692,22 +1692,27 @@ mod tests {
     }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn u256_overflowing_addition_panics() { let _ = U256::MAX + U256::ONE; }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn u256_overflowing_subtraction_panics() { let _ = U256::ZERO - U256::ONE; }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn u256_multiplication_by_max_panics() { let _ = U256::MAX * U256::MAX; }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn work_overflowing_addition_panics() { let _ = Work(U256::MAX) + Work(U256::ONE); }
 
     #[test]
+    #[cfg(debug_assertions)]
     #[should_panic]
     fn work_overflowing_subtraction_panics() { let _ = Work(U256::ZERO) - Work(U256::ONE); }