adding test case

Author: WingZer0o

src/password_hashers/argon2.rs

@@ -19,6 +19,18 @@ pub extern "C" fn argon2_hash_password_parameters(memory_cost: u32, iterations:
     return hash_cstr;
 }
 
+#[test]
+fn argon2_hash_password_parameters_test() {
+    let password = "TestPassword123!";
+    let password_cstr = CString::new(password).unwrap();
+    let password_bytes = password_cstr.as_bytes_with_nul();
+
+    let hash = argon2_hash_password_parameters(1024, 2, 1, password_bytes.as_ptr() as *const i8);
+    let hash_cstr = unsafe { CString::from_raw(hash) };
+    let hash_str = hash_cstr.to_str().unwrap();
+    assert!(!hash_str.is_empty());
+    assert_ne!(hash_str, password);
+}
 
 #[no_mangle]
 pub extern "C" fn argon2_derive_aes_128_key(hashed_password: *const c_char) -> Argon2KDFAes128 {