diff --git a/src/task.rs b/src/task.rs
index 8dfcaa3..a21b5aa 100644
--- a/src/task.rs
+++ b/src/task.rs
@@ -343,3 +343,34 @@ impl Display for State {
         fmt::Debug::fmt(self, f)
     }
 }
+
+#[cfg(test)]
+mod tasks_test {
+    use super::*;
+    use nostr_sdk::{EventBuilder, Keys};
+
+    #[test]
+    fn test_state() {
+        let keys = Keys::generate();
+        let mut task = Task::new(
+            EventBuilder::new(TASK_KIND, "task", [Tag::hashtag("tag1")])
+                .to_event(&keys).unwrap());
+        assert_eq!(task.pure_state(), State::Open);
+        assert_eq!(task.get_hashtags().count(), 1);
+        task.props.insert(
+            EventBuilder::new(State::Done.into(), "", [])
+                .to_event(&keys).unwrap());
+        assert_eq!(task.pure_state(), State::Done);
+        task.props.insert(
+            EventBuilder::new(State::Open.into(), "", [Tag::hashtag("tag2")])
+                .custom_created_at(Timestamp::from(Timestamp::now() - 2))
+                .to_event(&keys).unwrap());
+        assert_eq!(task.pure_state(), State::Done);
+        assert_eq!(task.get_hashtags().count(), 2);
+        task.props.insert(
+            EventBuilder::new(State::Closed.into(), "", [])
+                .custom_created_at(Timestamp::from(Timestamp::now() + 1))
+                .to_event(&keys).unwrap());
+        assert_eq!(task.pure_state(), State::Closed);
+    }
+}