test: added two test cases for get_storage_at (#500)

crates/beerus-core/tests/beerus.rs

@@ -1665,6 +1665,103 @@ mod tests {
         assert_eq!(res, expected_result);
     }
 
+    /// Test that starknet storage value is returned when the Starknet light client returns a value(second scenario)
+    #[tokio::test]
+    async fn given_normal_conditions_with_second_scenario_when_starknet_get_storage_at_should_work()
+    {
+        // Mock config, ethereum light client and starknet light client.
+        let (config, mut ethereum_lightclient_mock, mut starknet_lightclient_mock) = mock_clients();
+
+        let expected_result = FieldElement::from_hex_be("298305742194").unwrap();
+
+        let test_block_with_tx_hashes = BlockWithTxHashes {
+            status: BlockStatus::AcceptedOnL2,
+            block_hash: FieldElement::from_hex_be("0").unwrap(),
+            parent_hash: FieldElement::from_hex_be("0").unwrap(),
+            block_number: 10,
+            new_root: FieldElement::from_hex_be("0").unwrap(),
+            timestamp: 10,
+            sequencer_address: FieldElement::from_hex_be("0").unwrap(),
+            transactions: Vec::new(),
+        };
+
+        let test_block = MaybePendingBlockWithTxHashes::Block(test_block_with_tx_hashes);
+
+        // Set the expected return value for the StarkNet light client mock.
+        starknet_lightclient_mock
+            .expect_get_storage_at()
+            .times(1)
+            .return_once(move |_address, _key, _block_nb| Ok(expected_result));
+
+        starknet_lightclient_mock
+            .expect_get_block_with_tx_hashes()
+            .times(1)
+            .return_once(move |_block_id| Ok(test_block));
+
+        ethereum_lightclient_mock
+            .expect_starknet_last_proven_block()
+            .return_once(move || Ok(U256::from(10)));
+
+        // Create a new Beerus light client.
+        let beerus = BeerusLightClient::new(
+            config,
+            Box::new(ethereum_lightclient_mock),
+            Box::new(starknet_lightclient_mock),
+        );
+
+        let address = FieldElement::from_hex_be(
+            "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
+        )
+        .unwrap();
+
+        let key = selector!("ERC20_name");
+        let block_id = BlockId::Hash(FieldElement::from_hex_be("0").unwrap());
+
+        // Perform the test call.
+        let res = beerus
+            .starknet_get_storage_at(address, key, &block_id)
+            .await
+            .unwrap();
+
+        assert_eq!(res, expected_result);
+    }
+
+    /// Test that an error is return when getting storage at an unproven block
+    #[tokio::test]
+    async fn given_unproven_blockid_when_starknet_get_storage_at_should_fail_with_blockid_not_proven_err(
+    ) {
+        // Mock config, ethereum light client and starknet light client.
+        let (config, mut ethereum_lightclient_mock, starknet_lightclient_mock) = mock_clients();
+
+        ethereum_lightclient_mock
+            .expect_starknet_last_proven_block()
+            .return_once(move || Ok(U256::from(10)));
+
+        // Create a new Beerus light client.
+        let beerus = BeerusLightClient::new(
+            config,
+            Box::new(ethereum_lightclient_mock),
+            Box::new(starknet_lightclient_mock),
+        );
+
+        let address = FieldElement::from_hex_be(
+            "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
+        )
+        .unwrap();
+
+        let key = selector!("ERC20_name");
+        let block_id = BlockId::Number(11);
+
+        // Perform the test call.
+        let res = beerus
+            .starknet_get_storage_at(address, key, &block_id)
+            .await;
+
+        assert!(res.is_err());
+        let expected_result = "BlockId is not proven yet";
+        assert_eq!(res.unwrap_err().to_string(), expected_result.to_string());
+    }
+
     /// Test that starknet get_storage_at return an error when the StarkNet Light client returns an error.
     #[tokio::test]
     async fn given_starknet_lightclient_returns_error_when_starknet_get_storage_at_should_fail_with_same_error(