diff --git a/crates/systemd-credentials/src/lib.rs b/crates/systemd-credentials/src/lib.rs
index 376d1cd..cb1a1c0 100644
--- a/crates/systemd-credentials/src/lib.rs
+++ b/crates/systemd-credentials/src/lib.rs
@@ -66,7 +66,13 @@ pub trait ReadCredential {
 #[derive(Debug)]
 pub struct ReadCredDir<R: ReadEnv = EnvPath>(R);
 
-impl<R: ReadEnv> ReadCredential for ReadCredDir<R> {
+impl<R: ReadEnv> ReadCredDir<R> {
+    pub fn new(env_reader: R) -> Self {
+        Self(env_reader)
+    }
+}
+
+ impl<R: ReadEnv> ReadCredential for ReadCredDir<R> {
     fn read_credential(&self, name: &str) -> Result<Option<String>> {
         let credentials_dir = self.0.read_env(CREDENTIALS_DIRECTORY);
         let Ok(creds_dir) = credentials_dir.map(PathBuf::from) else {