diff --git a/starknet/src/types/user_address.cairo b/starknet/src/types/user_address.cairo
index 7753f9e1..b584dcf3 100644
--- a/starknet/src/types/user_address.cairo
+++ b/starknet/src/types/user_address.cairo
@@ -74,3 +74,24 @@ impl UserAddressZeroable of Zeroable<UserAddress> {
         !self.is_zero()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use zeroable::Zeroable;
+    use super::{UserAddress, UserAddressZeroable};
+    use starknet::{EthAddress, contract_address_const};
+
+    #[test]
+    fn test_is_zero() {
+        assert(UserAddress::Starknet(contract_address_const::<0>()).is_zero(), 'is not zero');
+        assert(UserAddress::Ethereum(EthAddress { address: 0 }).is_zero(), 'is not zero');
+        assert(UserAddress::Custom(0_u256).is_zero(), 'is not zero');
+    }
+
+    #[test]
+    fn test_is_non_zero() {
+        assert(UserAddress::Starknet(contract_address_const::<1>()).is_non_zero(), 'is zero');
+        assert(UserAddress::Ethereum(EthAddress { address: 1 }).is_non_zero(), 'is zero');
+        assert(UserAddress::Custom(1_u256).is_non_zero(), 'is zero');
+    }
+}