diff --git a/src/symbols/tls/csr.rs b/src/symbols/tls/csr.rs
index 4af3683..a5894fd 100644
--- a/src/symbols/tls/csr.rs
+++ b/src/symbols/tls/csr.rs
@@ -2,6 +2,7 @@ use crate::command_runner::CommandRunner;
 use crate::symbols::Symbol;
 use async_trait::async_trait;
 use std::borrow::Borrow;
+use std::convert::AsRef;
 use std::error::Error;
 use std::path::Path;
 
@@ -25,11 +26,9 @@ impl<C, D, K, P> Csr<C, D, K, P> {
 }
 
 #[async_trait(?Send)]
-impl<C: CommandRunner, D: Borrow<str>, K: Borrow<Path>, P: Borrow<Path>> Symbol
-  for Csr<C, D, K, P>
-{
+impl<C: CommandRunner, D: Borrow<str>, K: AsRef<Path>, P: AsRef<Path>> Symbol for Csr<C, D, K, P> {
   async fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
-    if !self.csr_path.borrow().exists() {
+    if !self.csr_path.as_ref().exists() {
       return Ok(false);
     }
 
@@ -37,10 +36,10 @@ impl<C: CommandRunner, D: Borrow<str>, K: Borrow<Path>, P: Borrow<Path>> Symbol
       .command_runner
       .get_stderr(
         "openssl",
-        args!["req", "-in", self.csr_path.borrow(), "-noout", "-verify",],
+        args!["req", "-in", self.csr_path.as_ref(), "-noout", "-verify",],
       )
       .await?;
-    Ok(output == b"verify OK\n")
+    Ok(output == b"verify OK\n" || output == b"Certificate request self-signature verify OK\n")
   }
 
   async fn execute(&self) -> Result<(), Box<dyn Error>> {
@@ -53,9 +52,9 @@ impl<C: CommandRunner, D: Borrow<str>, K: Borrow<Path>, P: Borrow<Path>> Symbol
           "-new",
           "-sha256",
           "-key",
-          self.key_path.borrow(),
+          self.key_path.as_ref(),
           "-out",
-          self.csr_path.borrow(),
+          self.csr_path.as_ref(),
           "-subj",
           format!("/CN={}", self.domain.borrow()),
         ],
@@ -65,4 +64,68 @@ impl<C: CommandRunner, D: Borrow<str>, K: Borrow<Path>, P: Borrow<Path>> Symbol
 }
 
 #[cfg(test)]
-mod test {}
+mod test {
+  use super::{Csr, Symbol};
+  use crate::async_utils::run;
+  use crate::command_runner::MockCommandRunner;
+
+  #[test]
+  fn test_bookworm_success() {
+    let mut command_runner = MockCommandRunner::new();
+    command_runner
+      .expect_get_stderr()
+      .times(1)
+      .returning(|_, _| Ok("Certificate request self-signature verify OK\n".into()));
+    let symbol = Csr::new(command_runner, "", "/nonexisting", "/"); // FIXME: Csr path has to be an existing file
+    run(async {
+      assert_eq!(symbol.target_reached().await.unwrap(), true);
+    });
+  }
+
+  #[test]
+  fn test_bookworm_invalid() {
+    let mut command_runner = MockCommandRunner::new();
+    command_runner
+      .expect_get_stderr()
+      .times(1)
+      .returning(|_, _| {
+        Ok("Unable to load X509 request
+40F746B61E7F0000:error:0480006C:PEM routines:get_name:no start line:../crypto/pem/pem_lib.c:763:Expecting: CERTIFICATE REQUEST
+" .into())
+      });
+    let symbol = Csr::new(command_runner, "", "/nonexisting", "/"); // FIXME: Csr path has to be an existing file
+    run(async {
+      assert_eq!(symbol.target_reached().await.unwrap(), false);
+    });
+  }
+
+  #[test]
+  fn test_bullseye_success() {
+    let mut command_runner = MockCommandRunner::new();
+    command_runner
+      .expect_get_stderr()
+      .times(1)
+      .returning(|_, _| Ok("verify OK\n".into()));
+    let symbol = Csr::new(command_runner, "", "/nonexisting", "/"); // FIXME: Csr path has to be an existing file
+    run(async {
+      assert_eq!(symbol.target_reached().await.unwrap(), true);
+    });
+  }
+
+  #[test]
+  fn test_bullseye_invalid() {
+    let mut command_runner = MockCommandRunner::new();
+    command_runner
+      .expect_get_stderr()
+      .times(1)
+      .returning(|_, _| {
+        Ok("unable to load X509 request
+140032085857600:error:0909006C:PEM routines:get_name:no start line:../crypto/pem/pem_lib.c:745:Expecting: CERTIFICATE REQUEST
+" .into())
+      });
+    let symbol = Csr::new(command_runner, "", "/nonexisting", "/"); // FIXME: Csr path has to be an existing file
+    run(async {
+      assert_eq!(symbol.target_reached().await.unwrap(), false);
+    });
+  }
+}