[crypto][test] Backwards compatibility test for address generation

sui_types/src/unit_tests/base_types_tests.rs

@@ -4,7 +4,7 @@
 
 #![allow(clippy::blacklisted_name)]
 use super::*;
-use crate::crypto::AuthoritySignature;
+use crate::crypto::{get_key_pair_from_bytes, AuthoritySignature, KeyPair};
 
 use move_binary_format::file_format;
 
@@ -309,3 +309,34 @@ fn test_move_package_size_for_gas_metering() {
     // Make sure to adjust `object_size_for_gas_metering()` to include those changes.
     assert_eq!(size + 5, serialized.len());
 }
+
+// A sample address in hex generated by the current address derivation algorithm.
+#[cfg(test)]
+const SAMPLE_ADDRESS: &str = "ee0437cf625b77af4d12bff98af1a88332b00638";
+
+// Derive a sample address and public key tuple from KeyPair bytes.
+fn derive_sample_address() -> (SuiAddress, KeyPair) {
+    let (address, pub_key) = get_key_pair_from_bytes(&[
+        10, 112, 5, 142, 174, 127, 187, 146, 251, 68, 22, 191, 128, 68, 84, 13, 102, 71, 77, 57,
+        92, 154, 128, 240, 158, 45, 13, 123, 57, 21, 194, 214, 189, 215, 127, 86, 129, 189, 1, 4,
+        90, 106, 17, 10, 123, 200, 40, 18, 34, 173, 240, 91, 213, 72, 183, 249, 213, 210, 39, 181,
+        105, 254, 59, 163,
+    ]);
+    (address, pub_key)
+}
+
+// Required to capture address derivation algorithm updates that break some tests and deployments.
+#[test]
+fn test_address_backwards_compatibility() {
+    use hex;
+    let (address, _) = derive_sample_address();
+    assert_eq!(
+        address.to_vec(),
+        hex::decode(SAMPLE_ADDRESS).expect("Decoding failed"),
+        "If this test broke, then the algorithm for deriving addresses from public keys has \
+               changed. If this was intentional, please compute a new sample address in hex format \
+               from `derive_sample_address` and update the SAMPLE_ADDRESS const above with the new \
+               derived address hex value. Note that existing deployments (i.e. devnet) might \
+               also require updates if they use fixed values generated by the old algorithm."
+    );
+}