diff --git a/creator-keys/tests/test_register_creator.rs b/creator-keys/tests/test_register_creator.rs
new file mode 100644
index 0000000..51b48e2
--- /dev/null
+++ b/creator-keys/tests/test_register_creator.rs
@@ -0,0 +1,47 @@
+mod contract_test_env;
+
+use contract_test_env::{register_creator_keys, test_env_with_auths};
+use creator_keys::{ContractError, HANDLE_LEN_MIN};
+use soroban_sdk::{testutils::Address as _, Address, String};
+
+#[test]
+fn test_register_creator_minimum_handle_length_success() {
+    let env = test_env_with_auths();
+    let (client, _) = register_creator_keys(&env);
+    let creator = Address::generate(&env);
+
+    // Create a handle of exactly HANDLE_LEN_MIN characters
+    let handle_bytes = [b'a'; HANDLE_LEN_MIN as usize];
+    let handle_str = core::str::from_utf8(&handle_bytes).unwrap();
+    let handle = String::from_str(&env, handle_str);
+
+    let result = client.try_register_creator(&creator, &handle);
+
+    // Happy path: the function succeeds
+    assert_eq!(result, Ok(Ok(())));
+
+    // State assertion: after a successful call, storage and derived views match expectations
+    assert!(client.is_creator_registered(&creator));
+    let profile = client.get_creator(&creator);
+    assert_eq!(profile.handle, handle);
+}
+
+#[test]
+fn test_register_creator_below_minimum_handle_length_fails() {
+    let env = test_env_with_auths();
+    let (client, _) = register_creator_keys(&env);
+    let creator = Address::generate(&env);
+
+    // Create a handle one character below HANDLE_LEN_MIN
+    let handle_bytes = [b'a'; (HANDLE_LEN_MIN - 1) as usize];
+    let handle_str = core::str::from_utf8(&handle_bytes).unwrap();
+    let handle = String::from_str(&env, handle_str);
+
+    let result = client.try_register_creator(&creator, &handle);
+
+    // Error case: expected failure
+    assert_eq!(result, Err(Ok(ContractError::HandleTooShort)));
+
+    // State assertion: failed calls do not leave partial state behind
+    assert!(!client.is_creator_registered(&creator));
+}