chore(miner): add BatchReturn serialization tests

runtime/Cargo.toml

@@ -34,6 +34,7 @@ serde_repr = { workspace = true }
 thiserror = { workspace = true }
 unsigned-varint = { workspace = true }
 vm_api = { workspace = true }
+const-hex = { workspace = true }
 
 # A fake-proofs dependency but... we can't select on that feature here because we enable it from
 # build.rs.

runtime/tests/types_test.rs

@@ -0,0 +1,54 @@
+// Tests to match with Go github.com/filecoin-project/go-state-types/*/BatchReturn
+mod serialization {
+    use fil_actors_runtime::{BatchReturn, BatchReturnGen};
+    use fvm_ipld_encoding::ipld_block::IpldBlock;
+    use fvm_shared::error::ExitCode;
+
+    #[test]
+    fn batch_return() {
+        let mut test_cases = vec![];
+
+        let mut gen = BatchReturnGen::new(0);
+        test_cases.push((
+            gen.gen(),
+            // [0,[]]
+            "820080",
+        ));
+
+        gen = BatchReturnGen::new(1);
+        gen.add_success();
+        test_cases.push((
+            gen.gen(),
+            // [1,[]]
+            "820180",
+        ));
+
+        gen = BatchReturnGen::new(1);
+        gen.add_fail(ExitCode::USR_ILLEGAL_ARGUMENT);
+        test_cases.push((
+            gen.gen(),
+            // [0,[[0,16]]]
+            "820081820010",
+        ));
+
+        gen = BatchReturnGen::new(5);
+        gen.add_success();
+        gen.add_fail(ExitCode::SYS_OUT_OF_GAS);
+        gen.add_fail(ExitCode::USR_ILLEGAL_STATE);
+        gen.add_success();
+        gen.add_fail(ExitCode::USR_ILLEGAL_ARGUMENT);
+
+        test_cases.push((
+            gen.gen(),
+            // [2,[[1,7],[2,20],[4,16]]]
+            "820283820107820214820410",
+        ));
+
+        for (params, expected_hex) in test_cases {
+            let encoded = IpldBlock::serialize_cbor(&params).unwrap().unwrap();
+            assert_eq!(const_hex::encode(&encoded.data), expected_hex);
+            let decoded: BatchReturn = IpldBlock::deserialize(&encoded).unwrap();
+            assert_eq!(params, decoded);
+        }
+    }
+}