build: add coverage_nightly attr to ignore unit tests code on coverage reports

Author: nymius

Cargo.toml

@@ -11,3 +11,6 @@ authors = ["Bitcoin Dev Kit Developers"]
 [workspace.lints.clippy]
 print_stdout = "deny"
 print_stderr = "deny"
+
+[workspace.lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(coverage,coverage_nightly)'] }

silentpayments/src/encoding/mod.rs

@@ -377,6 +377,7 @@ impl TryFrom<&str> for SilentPaymentCode {
 }
 
 #[cfg(test)]
+#[cfg_attr(coverage_nightly, coverage(off))]
 mod test {
     use std::str::FromStr;
 

silentpayments/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(coverage_nightly, feature(coverage_attribute))]
+
 pub mod encoding;
 pub mod hashes;
 pub mod receive;