test: contract artifact deserliazation integrity (#644)

Adds test cases that asserts contract artifacts are
not corrupted whether deserialized directly or via the
`ContractArtifact` enum. The test for `LegacyContractClass` -
`test_legacy_artifact_deser_from_contract_artifact` - is ignored due to
a known issue #392.

Author: xJonathanLEI

starknet-core/src/types/contract/legacy.rs

@@ -984,6 +984,7 @@ fn should_skip_attributes_for_hinted_hash(value: &Option<Vec<LegacyAttribute>>)
 
 #[cfg(test)]
 mod tests {
+    use super::super::ContractArtifact;
     use super::*;
 
     #[derive(serde::Deserialize)]
@@ -1007,6 +1008,32 @@ mod tests {
         }
     }
 
+    #[test]
+    #[ignore = "https://github.com/xJonathanLEI/starknet-rs/issues/392"]
+    fn test_legacy_artifact_deser_from_contract_artifact() {
+        for raw_artifact in [
+            include_str!("../../../test-data/contracts/cairo0/artifacts/oz_account.txt"),
+            include_str!("../../../test-data/contracts/cairo0/artifacts/event_example.txt"),
+            include_str!("../../../test-data/contracts/cairo0/artifacts/pre-0.11.0/oz_account.txt"),
+            include_str!(
+                "../../../test-data/contracts/cairo0/artifacts/pre-0.11.0/event_example.txt"
+            ),
+        ] {
+            let direct_deser = serde_json::from_str::<LegacyContractClass>(raw_artifact).unwrap();
+            let deser_via_contract_artifact =
+                match serde_json::from_str::<ContractArtifact>(raw_artifact).unwrap() {
+                    ContractArtifact::LegacyClass(class) => class,
+                    _ => panic!("unexpected artifact type"),
+                };
+
+            // Class should be identical however it's deserialized
+            assert_eq!(
+                direct_deser.class_hash().unwrap(),
+                deser_via_contract_artifact.class_hash().unwrap()
+            );
+        }
+    }
+
     #[test]
     #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
     fn test_contract_class_hash() {

starknet-core/src/types/contract/mod.rs

@@ -1023,10 +1023,18 @@ mod tests {
             include_str!("../../../test-data/contracts/cairo2/artifacts/erc20_sierra.txt"),
             include_str!("../../../test-data/contracts/cairo2.6/artifacts/erc20_sierra.txt"),
         ] {
-            match serde_json::from_str::<ContractArtifact>(raw_artifact) {
-                Ok(ContractArtifact::SierraClass(_)) => {}
+            let direct_deser = serde_json::from_str::<SierraClass>(raw_artifact).unwrap();
+            let via_contract_artifact = match serde_json::from_str::<ContractArtifact>(raw_artifact)
+            {
+                Ok(ContractArtifact::SierraClass(class)) => class,
                 _ => panic!("Unexpected result"),
-            }
+            };
+
+            // Class should be identical however it's deserialized
+            assert_eq!(
+                direct_deser.class_hash().unwrap(),
+                via_contract_artifact.class_hash().unwrap()
+            );
         }
     }
 
@@ -1040,10 +1048,18 @@ mod tests {
             include_str!("../../../test-data/contracts/cairo2/artifacts/erc20_compiled.txt"),
             include_str!("../../../test-data/contracts/cairo2.6/artifacts/erc20_compiled.txt"),
         ] {
-            match serde_json::from_str::<ContractArtifact>(raw_artifact) {
-                Ok(ContractArtifact::CompiledClass(_)) => {}
+            let direct_deser = serde_json::from_str::<CompiledClass>(raw_artifact).unwrap();
+            let via_contract_artifact = match serde_json::from_str::<ContractArtifact>(raw_artifact)
+            {
+                Ok(ContractArtifact::CompiledClass(class)) => class,
                 _ => panic!("Unexpected result"),
-            }
+            };
+
+            // Class should be identical however it's deserialized
+            assert_eq!(
+                direct_deser.class_hash().unwrap(),
+                via_contract_artifact.class_hash().unwrap()
+            );
         }
     }