Merge rust-bitcoin/rust-bitcoin#4666: Kill new mutants

f0562504b7 Exclude deprecated fn from mutation testing (Jamil Lambert, PhD)
4d31b141a8 Improve is_too_precise test (Jamil Lambert, PhD)
a2bae3bb0b Add test for impl Display for Script (Jamil Lambert, PhD)

Pull request description:

  Weekly mutation testing found new mutants. There are also some untested mutants in match statements that will be included in future mutation testing once #4654 goes in.
  
  - Add a regression test for the mutants in the `Display` impl for `Script`.
  - Improve the existing test for `is_too_precise` to check all four cases.
  - Exclude the two deprecated functions that have untested mutants.
  
  Closes #4646


ACKs for top commit:
  benalleng:
    **tACK** no missed mutants on f056250 I ran with 63b61e9497 rebased in to make sure the match arm and match guard mutations were included
  tcharding:
    ACK f0562504b7


Tree-SHA512: d109e30be91da2ab243a152b9ef17147337328282ac418fa9d2eebd17c2e2d9b6f7ee095d91ccf58e287c9620cb71a090b0d929c9bf35011feb26e6f28457dd3

.cargo/mutants.toml

@@ -24,6 +24,8 @@ exclude_re = [
     "SignedAmount::checked_abs", # Deprecated
     "NumberOfBlocks::value", # Deprecated
     "NumberOf512Seconds::to_consensus_u32", # Deprecated
+    "MedianTimePast::to_consensus_u32", # Deprecated
+    "Height::to_consensus_u32", # Deprecated
 
     # primitives
     "Sequence::from_512_second_intervals", # Mutant from replacing | with ^, this returns the same value since the XOR is taken against the u16 with an all-zero bitmask

primitives/src/script/mod.rs

@@ -802,6 +802,21 @@ mod tests {
         assert!(!format!("{:?}", script).is_empty());
     }
 
+    #[test]
+    fn script_display_pushdata() {
+        // OP_PUSHDATA1
+        let script = Script::from_bytes(&[0x4c, 0x02, 0xab, 0xcd]);
+        assert_eq!(format!("{}", script), "OP_PUSHDATA1 abcd");
+
+        // OP_PUSHDATA2
+        let script = Script::from_bytes(&[0x4d, 0x02, 0x00, 0x12, 0x34]);
+        assert_eq!(format!("{}", script), "OP_PUSHDATA2 1234");
+
+        // OP_PUSHDATA4
+        let script = Script::from_bytes(&[0x4e, 0x02, 0x00, 0x00, 0x00, 0x56, 0x78]);
+        assert_eq!(format!("{}", script), "OP_PUSHDATA4 5678");
+    }
+
     #[test]
     fn scriptbuf_display() {
         let script_buf = ScriptBuf::from(vec![0x00, 0xa1, 0xb2]);

units/src/amount/tests.rs

@@ -52,8 +52,14 @@ fn sanity_check() {
 
 #[test]
 fn check_if_num_is_too_precise() {
-    assert_eq!(is_too_precise("1234", 3).unwrap(), 3);
-    assert_eq!(is_too_precise("1234.1234", 3).unwrap(), 3);
+    // Has decimal, not too precise
+    assert_eq!(is_too_precise("1234.5678", 4), Some(0));
+    // Has decimal, is too precise
+    assert_eq!(is_too_precise("1234.5678", 3), Some(3));
+    // No decimal, not too precise
+    assert_eq!(is_too_precise("1234", 4), Some(0));
+    // No decimal, is too precise
+    assert_eq!(is_too_precise("1234", 2), Some(3));
 }
 
 #[test]