diff --git a/core/Cargo.toml b/core/Cargo.toml
index 7635b5b..2b4f6d5 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
 portfolio-entity = { path = "../entity" }
 rand = "0.8.5"
 chrono = "0.4.22"
@@ -28,7 +29,4 @@ features = [
 ]
 
 [dev-dependencies]
-tokio = "1.21.2"
-
-[features]
-mock = ["sea-orm/mock"]
+tokio = "1.21.2"
\ No newline at end of file
diff --git a/core/src/query.rs b/core/src/query.rs
index 72aa09f..a4e4236 100644
--- a/core/src/query.rs
+++ b/core/src/query.rs
@@ -8,3 +8,43 @@ impl Query {
         Candidate::find_by_id(id).one(db).await
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use sea_orm::{DbConn, Set, ActiveModelTrait};
+    use entity::candidate;
+    use sea_orm::{Schema, Database, DbBackend, sea_query::TableCreateStatement, ConnectionTrait};
+
+    use crate::Query;
+    
+    #[cfg(test)]
+    async fn get_memory_sqlite_connection() -> DbConn {
+        let base_url = "sqlite::memory:";
+        let db: DbConn = Database::connect(base_url).await.unwrap();
+    
+        let schema = Schema::new(DbBackend::Sqlite);
+        let stmt: TableCreateStatement = schema.create_table_from_entity(candidate::Entity);
+        db.execute(db.get_database_backend().build(&stmt)).await.unwrap();
+        db
+    }
+
+    #[tokio::test]
+    async fn test_find_candidate_by_id() {
+        let db = get_memory_sqlite_connection().await;
+        let candidate = candidate::ActiveModel {
+            application: Set(103158),
+            code: Set("test".to_string()),
+            public_key: Set("test".to_string()),
+            private_key: Set("test".to_string()),
+            created_at: Set(chrono::offset::Local::now().naive_local()),
+            updated_at: Set(chrono::offset::Local::now().naive_local()),
+            ..Default::default()
+        }
+            .insert(&db)
+            .await
+            .unwrap();
+    
+        let candidate = Query::find_candidate_by_id(&db, candidate.application).await.unwrap();
+        assert!(candidate.is_some());
+    }
+}
\ No newline at end of file
diff --git a/core/src/services/candidate_service.rs b/core/src/services/candidate_service.rs
index d91b155..8adb2e4 100644
--- a/core/src/services/candidate_service.rs
+++ b/core/src/services/candidate_service.rs
@@ -41,3 +41,58 @@ impl CandidateService {
         Ok(candidate)
     } 
 }
+
+
+
+#[cfg(test)]
+mod tests {
+    use entity::candidate;
+    use sea_orm::{DbConn, Database, sea_query::TableCreateStatement, DbBackend, Schema, ConnectionTrait};
+    use serde_json::json;
+
+    use crate::{crypto, Mutation, services::candidate_service::CandidateService, token};
+
+    #[cfg(test)]
+    async fn get_memory_sqlite_connection() -> DbConn {
+        let base_url = "sqlite::memory:";
+        let db: DbConn = Database::connect(base_url).await.unwrap();
+    
+        let schema = Schema::new(DbBackend::Sqlite);
+        let stmt: TableCreateStatement = schema.create_table_from_entity(candidate::Entity);
+        db.execute(db.get_database_backend().build(&stmt)).await.unwrap();
+        db
+    }
+    
+    #[tokio::test]
+    async fn test_create_candidate() {
+        let db = get_memory_sqlite_connection().await;
+    
+        let form = serde_json::from_value(json!({
+                "application": 5555555,
+            })).unwrap();
+    
+        let candidate = Mutation::create_candidate(&db, form, &"Tajny_kod".to_string()).await.unwrap();
+    
+        assert_eq!(candidate.application, 5555555);
+        assert_ne!(candidate.code, "Tajny_kod".to_string());
+        assert!(crypto::verify_password("Tajny_kod", &*candidate.code).ok().unwrap());
+    }
+    
+    
+    #[tokio::test]
+    async fn test_candidate_jwt() {
+        let db = &get_memory_sqlite_connection().await;
+    
+        let form = serde_json::from_value(json!({
+            "application": 5555555,
+        })).unwrap();
+    
+        let candidate = Mutation::create_candidate(&db, form, &"Tajny_kod".to_string()).await.unwrap();
+    
+        let jwt = CandidateService::login(db, 5555555, "Tajny_kod".to_string()).await.ok().unwrap();
+    
+        let claims = token::decode_candidate_token(jwt).ok().unwrap().claims;
+    
+        assert_eq!(claims.application_id, candidate.application);
+    }
+}
\ No newline at end of file