diff --git a/server/src/infra/ldap/compare.rs b/server/src/infra/ldap/compare.rs
new file mode 100644
index 0000000..ed1756e
--- /dev/null
+++ b/server/src/infra/ldap/compare.rs
@@ -0,0 +1,239 @@
+use crate::domain::ldap::error::{LdapError, LdapResult};
+use ldap3_proto::proto::{LdapCompareRequest, LdapOp, LdapResult as LdapResultOp, LdapResultCode};
+use lldap_domain::types::AttributeName;
+
+pub fn compare(
+    request: LdapCompareRequest,
+    search_results: Vec<LdapOp>,
+    base_dn_str: &str,
+) -> LdapResult<Vec<LdapOp>> {
+    if search_results.len() > 2 {
+        // SearchResultEntry + SearchResultDone
+        return Err(LdapError {
+            code: LdapResultCode::OperationsError,
+            message: "Too many search results".to_string(),
+        });
+    }
+    let requested_attribute = AttributeName::from(&request.atype);
+    match search_results.first() {
+        Some(LdapOp::SearchResultEntry(entry)) => {
+            let available = entry.attributes.iter().any(|attr| {
+                AttributeName::from(&attr.atype) == requested_attribute
+                    && attr.vals.contains(&request.val)
+            });
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: if available {
+                    LdapResultCode::CompareTrue
+                } else {
+                    LdapResultCode::CompareFalse
+                },
+                matcheddn: request.dn,
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        }
+        Some(LdapOp::SearchResultDone(_)) => Ok(vec![LdapOp::CompareResult(LdapResultOp {
+            code: LdapResultCode::NoSuchObject,
+            matcheddn: base_dn_str.to_string(),
+            message: "".to_string(),
+            referral: vec![],
+        })]),
+        None => Err(LdapError {
+            code: LdapResultCode::OperationsError,
+            message: "Search request returned nothing".to_string(),
+        }),
+        _ => Err(LdapError {
+            code: LdapResultCode::OperationsError,
+            message: "Unexpected results from search".to_string(),
+        }),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::infra::{
+        ldap::handler::tests::setup_bound_admin_handler, test_utils::MockTestBackendHandler,
+    };
+    use chrono::TimeZone;
+    use lldap_domain::{types::*, uuid};
+    use lldap_domain_handlers::handler::*;
+    use pretty_assertions::assert_eq;
+    use tokio;
+
+    #[tokio::test]
+    async fn test_compare_user() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_list_users().returning(|f, g| {
+            assert_eq!(f, Some(UserRequestFilter::UserId(UserId::new("bob"))));
+            assert!(!g);
+            Ok(vec![UserAndGroups {
+                user: User {
+                    user_id: UserId::new("bob"),
+                    email: "bob@bobmail.bob".into(),
+                    ..Default::default()
+                },
+                groups: None,
+            }])
+        });
+        mock.expect_list_groups().returning(|_| Ok(vec![]));
+        let mut ldap_handler = setup_bound_admin_handler(mock).await;
+        let dn = "uid=bob,ou=people,dc=example,dc=com";
+        let request = LdapCompareRequest {
+            dn: dn.to_string(),
+            atype: "uid".to_owned(),
+            val: b"bob".to_vec(),
+        };
+        assert_eq!(
+            ldap_handler.do_compare(request).await,
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: LdapResultCode::CompareTrue,
+                matcheddn: dn.to_string(),
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        );
+        // Non-canonical attribute.
+        let request = LdapCompareRequest {
+            dn: dn.to_string(),
+            atype: "eMail".to_owned(),
+            val: b"bob@bobmail.bob".to_vec(),
+        };
+        assert_eq!(
+            ldap_handler.do_compare(request).await,
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: LdapResultCode::CompareTrue,
+                matcheddn: dn.to_string(),
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        );
+    }
+
+    #[tokio::test]
+    async fn test_compare_group() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_list_users().returning(|_, _| Ok(vec![]));
+        mock.expect_list_groups().returning(|f| {
+            assert_eq!(f, Some(GroupRequestFilter::DisplayName("group".into())));
+            Ok(vec![Group {
+                id: GroupId(1),
+                display_name: "group".into(),
+                creation_date: chrono::Utc.timestamp_opt(42, 42).unwrap().naive_utc(),
+                users: vec![UserId::new("bob")],
+                uuid: uuid!("04ac75e0-2900-3e21-926c-2f732c26b3fc"),
+                attributes: Vec::new(),
+            }])
+        });
+        let mut ldap_handler = setup_bound_admin_handler(mock).await;
+        let dn = "uid=group,ou=groups,dc=example,dc=com";
+        let request = LdapCompareRequest {
+            dn: dn.to_string(),
+            atype: "uid".to_owned(),
+            val: b"group".to_vec(),
+        };
+        assert_eq!(
+            ldap_handler.do_compare(request).await,
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: LdapResultCode::CompareTrue,
+                matcheddn: dn.to_string(),
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        );
+    }
+
+    #[tokio::test]
+    async fn test_compare_not_found() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_list_users().returning(|f, g| {
+            assert_eq!(f, Some(UserRequestFilter::UserId(UserId::new("bob"))));
+            assert!(!g);
+            Ok(vec![])
+        });
+        mock.expect_list_groups().returning(|_| Ok(vec![]));
+        let mut ldap_handler = setup_bound_admin_handler(mock).await;
+        let dn = "uid=bob,ou=people,dc=example,dc=com";
+        let request = LdapCompareRequest {
+            dn: dn.to_string(),
+            atype: "uid".to_owned(),
+            val: b"bob".to_vec(),
+        };
+        assert_eq!(
+            ldap_handler.do_compare(request).await,
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: LdapResultCode::NoSuchObject,
+                matcheddn: "dc=example,dc=com".to_owned(),
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        );
+    }
+
+    #[tokio::test]
+    async fn test_compare_no_match() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_list_users().returning(|f, g| {
+            assert_eq!(f, Some(UserRequestFilter::UserId(UserId::new("bob"))));
+            assert!(!g);
+            Ok(vec![UserAndGroups {
+                user: User {
+                    user_id: UserId::new("bob"),
+                    email: "bob@bobmail.bob".into(),
+                    ..Default::default()
+                },
+                groups: None,
+            }])
+        });
+        mock.expect_list_groups().returning(|_| Ok(vec![]));
+        let mut ldap_handler = setup_bound_admin_handler(mock).await;
+        let dn = "uid=bob,ou=people,dc=example,dc=com";
+        let request = LdapCompareRequest {
+            dn: dn.to_string(),
+            atype: "mail".to_owned(),
+            val: b"bob@bob".to_vec(),
+        };
+        assert_eq!(
+            ldap_handler.do_compare(request).await,
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: LdapResultCode::CompareFalse,
+                matcheddn: dn.to_string(),
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        );
+    }
+
+    #[tokio::test]
+    async fn test_compare_group_member() {
+        let mut mock = MockTestBackendHandler::new();
+        mock.expect_list_users().returning(|_, _| Ok(vec![]));
+        mock.expect_list_groups().returning(|f| {
+            assert_eq!(f, Some(GroupRequestFilter::DisplayName("group".into())));
+            Ok(vec![Group {
+                id: GroupId(1),
+                display_name: "group".into(),
+                creation_date: chrono::Utc.timestamp_opt(42, 42).unwrap().naive_utc(),
+                users: vec![UserId::new("bob")],
+                uuid: uuid!("04ac75e0-2900-3e21-926c-2f732c26b3fc"),
+                attributes: Vec::new(),
+            }])
+        });
+        let mut ldap_handler = setup_bound_admin_handler(mock).await;
+        let dn = "uid=group,ou=groups,dc=example,dc=com";
+        let request = LdapCompareRequest {
+            dn: dn.to_string(),
+            atype: "uniqueMember".to_owned(),
+            val: b"uid=bob,ou=people,dc=example,dc=com".to_vec(),
+        };
+        assert_eq!(
+            ldap_handler.do_compare(request).await,
+            Ok(vec![LdapOp::CompareResult(LdapResultOp {
+                code: LdapResultCode::CompareTrue,
+                matcheddn: dn.to_owned(),
+                message: "".to_string(),
+                referral: vec![],
+            })])
+        );
+    }
+}
diff --git a/server/src/infra/ldap/handler.rs b/server/src/infra/ldap/handler.rs
index 29a37b3..344502b 100644
--- a/server/src/infra/ldap/handler.rs
+++ b/server/src/infra/ldap/handler.rs
@@ -20,6 +20,7 @@ use crate::{
                 self, is_root_dse_request, make_search_error, make_search_request,
                 make_search_success, root_dse_response,
             },
+            compare,
         },
     },
 };
@@ -492,47 +493,7 @@ impl<Backend: BackendHandler + LoginHandler + OpaqueHandler> LdapHandler<Backend
             LdapFilter::Equality("dn".to_string(), request.dn.to_string()),
             vec![request.atype.clone()],
         );
-        let entries = self.do_search(&req).await?;
-        if entries.len() > 2 {
-            // SearchResultEntry + SearchResultDone
-            return Err(LdapError {
-                code: LdapResultCode::OperationsError,
-                message: "Too many search results".to_string(),
-            });
-        }
-        let requested_attribute = AttributeName::from(&request.atype);
-        match entries.first() {
-            Some(LdapOp::SearchResultEntry(entry)) => {
-                let available = entry.attributes.iter().any(|attr| {
-                    AttributeName::from(&attr.atype) == requested_attribute
-                        && attr.vals.contains(&request.val)
-                });
-                Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                    code: if available {
-                        LdapResultCode::CompareTrue
-                    } else {
-                        LdapResultCode::CompareFalse
-                    },
-                    matcheddn: request.dn,
-                    message: "".to_string(),
-                    referral: vec![],
-                })])
-            }
-            Some(LdapOp::SearchResultDone(_)) => Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::NoSuchObject,
-                matcheddn: self.ldap_info.base_dn_str.clone(),
-                message: "".to_string(),
-                referral: vec![],
-            })]),
-            None => Err(LdapError {
-                code: LdapResultCode::OperationsError,
-                message: "Search request returned nothing".to_string(),
-            }),
-            _ => Err(LdapError {
-                code: LdapResultCode::OperationsError,
-                message: "Unexpected results from search".to_string(),
-            }),
-        }
+        compare::compare(request, self.do_search(&req).await?, &self.ldap_info.base_dn_str)
     }
 
     pub async fn handle_ldap_message(&mut self, ldap_op: LdapOp) -> Option<Vec<LdapOp>> {
@@ -768,179 +729,4 @@ pub mod tests {
         );
     }
 
-    #[tokio::test]
-    async fn test_compare_user() {
-        let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().returning(|f, g| {
-            assert_eq!(f, Some(UserRequestFilter::UserId(UserId::new("bob"))));
-            assert!(!g);
-            Ok(vec![UserAndGroups {
-                user: User {
-                    user_id: UserId::new("bob"),
-                    email: "bob@bobmail.bob".into(),
-                    ..Default::default()
-                },
-                groups: None,
-            }])
-        });
-        mock.expect_list_groups().returning(|_| Ok(vec![]));
-        let mut ldap_handler = setup_bound_admin_handler(mock).await;
-        let dn = "uid=bob,ou=people,dc=example,dc=com";
-        let request = LdapCompareRequest {
-            dn: dn.to_string(),
-            atype: "uid".to_owned(),
-            val: b"bob".to_vec(),
-        };
-        assert_eq!(
-            ldap_handler.do_compare(request).await,
-            Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::CompareTrue,
-                matcheddn: dn.to_string(),
-                message: "".to_string(),
-                referral: vec![],
-            })])
-        );
-        // Non-canonical attribute.
-        let request = LdapCompareRequest {
-            dn: dn.to_string(),
-            atype: "eMail".to_owned(),
-            val: b"bob@bobmail.bob".to_vec(),
-        };
-        assert_eq!(
-            ldap_handler.do_compare(request).await,
-            Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::CompareTrue,
-                matcheddn: dn.to_string(),
-                message: "".to_string(),
-                referral: vec![],
-            })])
-        );
-    }
-
-    #[tokio::test]
-    async fn test_compare_group() {
-        let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().returning(|_, _| Ok(vec![]));
-        mock.expect_list_groups().returning(|f| {
-            assert_eq!(f, Some(GroupRequestFilter::DisplayName("group".into())));
-            Ok(vec![Group {
-                id: GroupId(1),
-                display_name: "group".into(),
-                creation_date: chrono::Utc.timestamp_opt(42, 42).unwrap().naive_utc(),
-                users: vec![UserId::new("bob")],
-                uuid: uuid!("04ac75e0-2900-3e21-926c-2f732c26b3fc"),
-                attributes: Vec::new(),
-            }])
-        });
-        let mut ldap_handler = setup_bound_admin_handler(mock).await;
-        let dn = "uid=group,ou=groups,dc=example,dc=com";
-        let request = LdapCompareRequest {
-            dn: dn.to_string(),
-            atype: "uid".to_owned(),
-            val: b"group".to_vec(),
-        };
-        assert_eq!(
-            ldap_handler.do_compare(request).await,
-            Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::CompareTrue,
-                matcheddn: dn.to_string(),
-                message: "".to_string(),
-                referral: vec![],
-            })])
-        );
-    }
-
-    #[tokio::test]
-    async fn test_compare_not_found() {
-        let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().returning(|f, g| {
-            assert_eq!(f, Some(UserRequestFilter::UserId(UserId::new("bob"))));
-            assert!(!g);
-            Ok(vec![])
-        });
-        mock.expect_list_groups().returning(|_| Ok(vec![]));
-        let mut ldap_handler = setup_bound_admin_handler(mock).await;
-        let dn = "uid=bob,ou=people,dc=example,dc=com";
-        let request = LdapCompareRequest {
-            dn: dn.to_string(),
-            atype: "uid".to_owned(),
-            val: b"bob".to_vec(),
-        };
-        assert_eq!(
-            ldap_handler.do_compare(request).await,
-            Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::NoSuchObject,
-                matcheddn: "dc=example,dc=com".to_owned(),
-                message: "".to_string(),
-                referral: vec![],
-            })])
-        );
-    }
-
-    #[tokio::test]
-    async fn test_compare_no_match() {
-        let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().returning(|f, g| {
-            assert_eq!(f, Some(UserRequestFilter::UserId(UserId::new("bob"))));
-            assert!(!g);
-            Ok(vec![UserAndGroups {
-                user: User {
-                    user_id: UserId::new("bob"),
-                    email: "bob@bobmail.bob".into(),
-                    ..Default::default()
-                },
-                groups: None,
-            }])
-        });
-        mock.expect_list_groups().returning(|_| Ok(vec![]));
-        let mut ldap_handler = setup_bound_admin_handler(mock).await;
-        let dn = "uid=bob,ou=people,dc=example,dc=com";
-        let request = LdapCompareRequest {
-            dn: dn.to_string(),
-            atype: "mail".to_owned(),
-            val: b"bob@bob".to_vec(),
-        };
-        assert_eq!(
-            ldap_handler.do_compare(request).await,
-            Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::CompareFalse,
-                matcheddn: dn.to_string(),
-                message: "".to_string(),
-                referral: vec![],
-            })])
-        );
-    }
-
-    #[tokio::test]
-    async fn test_compare_group_member() {
-        let mut mock = MockTestBackendHandler::new();
-        mock.expect_list_users().returning(|_, _| Ok(vec![]));
-        mock.expect_list_groups().returning(|f| {
-            assert_eq!(f, Some(GroupRequestFilter::DisplayName("group".into())));
-            Ok(vec![Group {
-                id: GroupId(1),
-                display_name: "group".into(),
-                creation_date: chrono::Utc.timestamp_opt(42, 42).unwrap().naive_utc(),
-                users: vec![UserId::new("bob")],
-                uuid: uuid!("04ac75e0-2900-3e21-926c-2f732c26b3fc"),
-                attributes: Vec::new(),
-            }])
-        });
-        let mut ldap_handler = setup_bound_admin_handler(mock).await;
-        let dn = "uid=group,ou=groups,dc=example,dc=com";
-        let request = LdapCompareRequest {
-            dn: dn.to_string(),
-            atype: "uniqueMember".to_owned(),
-            val: b"uid=bob,ou=people,dc=example,dc=com".to_vec(),
-        };
-        assert_eq!(
-            ldap_handler.do_compare(request).await,
-            Ok(vec![LdapOp::CompareResult(LdapResultOp {
-                code: LdapResultCode::CompareTrue,
-                matcheddn: dn.to_owned(),
-                message: "".to_string(),
-                referral: vec![],
-            })])
-        );
-    }
 }
diff --git a/server/src/infra/ldap/mod.rs b/server/src/infra/ldap/mod.rs
index 44813b9..8195949 100644
--- a/server/src/infra/ldap/mod.rs
+++ b/server/src/infra/ldap/mod.rs
@@ -1,3 +1,4 @@
+pub mod compare;
 pub mod handler;
 pub mod password;
 pub mod search;