diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 16472807..d416a644 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -22,11 +22,15 @@ Code coverage stats are generated automatically in CI. To generate coverage stat
 # Install coverage dependencies
 cargo binstall grcov
 rustup component add llvm-tools
+# If you have Nix on you system, you can install the `genhtml` command using the nix package.
+# Todo: other methods of installing `genhtml`
+nix-env -iA nixpkgs.lcov
 # Build + run tests with coverage
-cargo llvm-cov --no-report nextest --all-features
+cargo llvm-cov --no-report nextest --all-features 
 # Generate and open an HTML coverage report
-grcov . -s . --binary-path ./target/debug/ -t html --branch --ignore-not-existing -o ./target/debug/coverage/
-open target/debug/coverage/index.html
+cargo llvm-cov report --lcov --output-path ./target/llvm-cov-target/debug/lcov.info
+genhtml -o ./target/llvm-cov-target/debug/coverage/ --show-details --highlight --ignore-errors source --legend ./target/llvm-cov-target/debug/lcov.info
+open target/llvm-cov-target/debug/coverage/index.html
 ```
 
 # Releases
diff --git a/src/util/serde_util.rs b/src/util/serde_util.rs
index 95b41cad..20aaa305 100644
--- a/src/util/serde_util.rs
+++ b/src/util/serde_util.rs
@@ -56,7 +56,7 @@ pub fn default_true() -> bool {
 
 #[cfg(test)]
 mod tests {
-    use crate::util::serde_util::UriOrString;
+    use super::*;
     use serde_derive::{Deserialize, Serialize};
     use serde_json::from_str;
     use std::str::FromStr;
@@ -85,9 +85,26 @@ mod tests {
         assert_eq!(s, r#"{"inner":"https://example.com/"}"#);
     }
 
+    #[test]
+    fn uri_or_string_uri_variant_to_string() {
+        let uri = UriOrString::Uri(Url::from_str("https://example.com").unwrap());
+        assert_eq!("https://example.com/", uri.to_string());
+    }
+
+    #[test]
+    fn uri_or_string_string_variant_to_string() {
+        let uri = UriOrString::String("foo".to_string());
+        assert_eq!("foo", uri.to_string());
+    }
+
     #[test]
     fn deserialize_uri_or_string_as_string() {
         let value: Wrapper<UriOrString> = from_str(r#"{"inner": "invalid-uri"}"#).unwrap();
         assert_eq!(value.inner, UriOrString::String("invalid-uri".to_string()));
     }
+
+    #[test]
+    fn default_true_returns_true() {
+        assert!(default_true());
+    }
 }