diff --git a/Cargo.lock b/Cargo.lock
index caf3adad23..5ff6f96f31 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -684,6 +684,7 @@ version = "0.16.0-pre"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "ckb-core 0.16.0-pre",
+ "ckb-crypto 0.16.0-pre",
  "ckb-jsonrpc-types 0.16.0-pre",
  "ckb-logger 0.16.0-pre",
  "ckb-multisig 0.16.0-pre",
diff --git a/util/crypto/src/secp/mod.rs b/util/crypto/src/secp/mod.rs
index b77220fdee..fe6788dd46 100644
--- a/util/crypto/src/secp/mod.rs
+++ b/util/crypto/src/secp/mod.rs
@@ -33,12 +33,20 @@ mod tests {
         message
     }
 
+    #[test]
+    fn test_gen_keypair() {
+        let gen = Generator::new();
+        let (privkey, pubkey) = gen.random_keypair().expect("gen keypair");
+        assert_eq!(privkey.pubkey().expect("pubkey"), pubkey);
+    }
+
     #[test]
     fn test_sign_verify() {
         let gen = Generator::new();
         let (privkey, pubkey) = gen.random_keypair().unwrap();
         let message = random_message();
         let signature = privkey.sign_recoverable(&message).unwrap();
+        assert!(signature.is_valid());
         assert!(pubkey.verify(&message, &signature).is_ok());
     }
 
@@ -51,4 +59,25 @@ mod tests {
         assert_eq!(pubkey, signature.recover(&message).unwrap());
     }
 
+    #[test]
+    fn test_serialize() {
+        let gen = Generator::new();
+        let (privkey, pubkey) = gen.random_keypair().expect("gen keypair");
+        let ser_pubkey = privkey.pubkey().expect("pubkey").serialize();
+        assert_eq!(ser_pubkey.len(), 33);
+        let deser_pubkey = Pubkey::from_slice(&ser_pubkey).expect("deserialize pubkey");
+        assert_eq!(deser_pubkey, pubkey);
+
+        let deser_privkey = Privkey::from_slice(privkey.as_ref());
+        assert_eq!(deser_privkey, privkey);
+
+        let msg = random_message();
+        let signature = privkey.sign_recoverable(&msg).expect("sign");
+        let ser_signature = signature.serialize();
+        assert_eq!(ser_signature.len(), 65);
+        let deser_signature = Signature::from_slice(&ser_signature).expect("deserialize");
+        assert!(deser_signature.is_valid());
+        assert_eq!(ser_signature, deser_signature.serialize());
+    }
+
 }
diff --git a/util/crypto/src/secp/privkey.rs b/util/crypto/src/secp/privkey.rs
index d8957affbf..4fc66fbe68 100644
--- a/util/crypto/src/secp/privkey.rs
+++ b/util/crypto/src/secp/privkey.rs
@@ -53,6 +53,12 @@ impl Into<H256> for Privkey {
     }
 }
 
+impl AsRef<[u8]> for Privkey {
+    fn as_ref(&self) -> &[u8] {
+        self.inner.as_bytes()
+    }
+}
+
 impl FromStr for Privkey {
     type Err = Error;
 
diff --git a/util/network-alert/Cargo.toml b/util/network-alert/Cargo.toml
index 619969f803..4bf49a7f7d 100644
--- a/util/network-alert/Cargo.toml
+++ b/util/network-alert/Cargo.toml
@@ -23,3 +23,6 @@ serde = "1.0"
 serde_derive = "1.0"
 flatbuffers = "0.6.0"
 
+[dev-dependencies]
+ckb-crypto = { path = "../crypto" }
+
diff --git a/util/network-alert/src/lib.rs b/util/network-alert/src/lib.rs
index 58023f4c5c..8513def523 100644
--- a/util/network-alert/src/lib.rs
+++ b/util/network-alert/src/lib.rs
@@ -10,6 +10,8 @@
 pub mod alert_relayer;
 pub mod config;
 pub mod notifier;
+#[cfg(test)]
+mod tests;
 pub mod verifier;
 
 use std::time::Duration;
diff --git a/util/network-alert/src/tests/mod.rs b/util/network-alert/src/tests/mod.rs
new file mode 100644
index 0000000000..5efd82745f
--- /dev/null
+++ b/util/network-alert/src/tests/mod.rs
@@ -0,0 +1,2 @@
+mod test_notifier;
+mod test_verifier;
diff --git a/util/network-alert/src/tests/test_notifier.rs b/util/network-alert/src/tests/test_notifier.rs
new file mode 100644
index 0000000000..01d54616ee
--- /dev/null
+++ b/util/network-alert/src/tests/test_notifier.rs
@@ -0,0 +1,88 @@
+use crate::notifier::Notifier;
+use ckb_core::alert::AlertBuilder;
+use std::sync::Arc;
+
+#[test]
+fn test_notice_alerts_by_version() {
+    let mut notifier = Notifier::new("0.1.0".into());
+    let alert1 = Arc::new(
+        AlertBuilder::default()
+            .id(1)
+            .max_version(Some("0.2.0".into()))
+            .min_version(Some("0.1.0".into()))
+            .build(),
+    );
+    let alert2 = Arc::new(
+        AlertBuilder::default()
+            .id(2)
+            .max_version(Some("0.0.2".into()))
+            .build(),
+    );
+    notifier.add(alert1);
+    notifier.add(alert2);
+    assert_eq!(notifier.received_alerts().len(), 2);
+    assert_eq!(notifier.noticed_alerts().len(), 1);
+    assert_eq!(notifier.noticed_alerts()[0].id, 1);
+}
+
+#[test]
+fn test_received_alerts() {
+    let mut notifier = Notifier::new("0.1.0".into());
+    let alert1 = Arc::new(
+        AlertBuilder::default()
+            .id(1)
+            .max_version(Some("0.2.0".into()))
+            .min_version(Some("0.1.0".into()))
+            .build(),
+    );
+    let dup_alert1 = Arc::new(AlertBuilder::default().id(1).build());
+    notifier.add(Arc::clone(&alert1));
+    assert!(notifier.has_received(1));
+    notifier.add(dup_alert1);
+    assert_eq!(notifier.received_alerts().len(), 1);
+    assert_eq!(notifier.received_alerts()[0].hash(), alert1.hash());
+}
+
+#[test]
+fn test_cancel_alert() {
+    let mut notifier = Notifier::new("0.1.0".into());
+    let alert1 = Arc::new(
+        AlertBuilder::default()
+            .id(1)
+            .max_version(Some("0.2.0".into()))
+            .min_version(Some("0.1.0".into()))
+            .build(),
+    );
+    let cancel_alert1 = Arc::new(AlertBuilder::default().id(2).cancel(1).build());
+    notifier.add(Arc::clone(&alert1));
+    assert!(notifier.has_received(1));
+    notifier.add(Arc::clone(&cancel_alert1));
+    assert!(notifier.has_received(1));
+    assert!(notifier.has_received(2));
+    assert_eq!(notifier.received_alerts().len(), 1);
+    assert_eq!(notifier.noticed_alerts().len(), 1);
+    assert_eq!(notifier.received_alerts()[0].hash(), cancel_alert1.hash());
+}
+
+#[test]
+fn test_clear_expired_alerts() {
+    let mut notifier = Notifier::new("0.1.0".into());
+    let notice_until = 1_561_084_974_000;
+    let before_expired_time = notice_until - 1000;
+    let after_expired_time = notice_until + 1000;
+    let alert1 = Arc::new(
+        AlertBuilder::default()
+            .id(1)
+            .notice_until(notice_until)
+            .build(),
+    );
+    notifier.add(Arc::clone(&alert1));
+    notifier.clear_expired_alerts(before_expired_time);
+    assert!(notifier.has_received(1));
+    assert_eq!(notifier.received_alerts().len(), 1);
+    assert_eq!(notifier.noticed_alerts().len(), 1);
+    notifier.clear_expired_alerts(after_expired_time);
+    assert!(!notifier.has_received(1));
+    assert_eq!(notifier.received_alerts().len(), 0);
+    assert_eq!(notifier.noticed_alerts().len(), 0);
+}
diff --git a/util/network-alert/src/tests/test_verifier.rs b/util/network-alert/src/tests/test_verifier.rs
new file mode 100644
index 0000000000..f115588865
--- /dev/null
+++ b/util/network-alert/src/tests/test_verifier.rs
@@ -0,0 +1,33 @@
+use crate::config::Config;
+use crate::verifier::Verifier;
+use ckb_core::alert::AlertBuilder;
+use ckb_crypto::secp::Generator;
+use ckb_jsonrpc_types::JsonBytes;
+
+#[test]
+fn test_veirifer() {
+    let keypairs: Vec<_> = (0..3)
+        .map(move |_| Generator::new().random_keypair())
+        .collect::<Result<Vec<_>, _>>()
+        .expect("random keypair");
+    let config = Config {
+        signatures_threshold: 2,
+        public_keys: keypairs
+            .iter()
+            .map(|(_, pubkey)| JsonBytes::from_vec(pubkey.serialize()))
+            .collect(),
+    };
+    let verifier = Verifier::new(config);
+    let mut alert = AlertBuilder::default().id(1).build();
+    let hash = alert.hash();
+    let signatures = keypairs
+        .iter()
+        .map(|(privkey, _)| privkey.sign_recoverable(&hash))
+        .collect::<Result<Vec<_>, _>>()
+        .expect("sign alert");
+    alert.signatures = signatures
+        .into_iter()
+        .map(|s| s.serialize().into())
+        .collect();
+    assert!(verifier.verify_signatures(&alert).is_ok());
+}