anvil-polkadot: add support for testing smart contracts (paritytech#342)

* anvil-polkadot: add support for testing smart contracts

Author: alindima

crates/anvil-polkadot/test-data/SimpleStorage.json

@@ -0,0 +1,50 @@
+{
+    "abi": [
+        {
+            "inputs": [],
+            "stateMutability": "nonpayable",
+            "type": "constructor"
+        },
+        {
+            "inputs": [],
+            "name": "getValue",
+            "outputs": [
+                {
+                    "internalType": "uint256",
+                    "name": "",
+                    "type": "uint256"
+                }
+            ],
+            "stateMutability": "view",
+            "type": "function"
+        },
+        {
+            "inputs": [
+                {
+                    "internalType": "uint256",
+                    "name": "_value",
+                    "type": "uint256"
+                }
+            ],
+            "name": "setValue",
+            "outputs": [],
+            "stateMutability": "nonpayable",
+            "type": "function"
+        },
+        {
+            "inputs": [],
+            "name": "storedValue",
+            "outputs": [
+                {
+                    "internalType": "uint256",
+                    "name": "",
+                    "type": "uint256"
+                }
+            ],
+            "stateMutability": "view",
+            "type": "function"
+        }
+    ],
+    "bin": "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",
+    "bin-runtime": "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"
+}

crates/anvil-polkadot/test-data/SimpleStorage.sol

@@ -0,0 +1,18 @@
+pragma solidity ^0.8.0;
+
+contract SimpleStorage {
+    // Storage slot 0
+    uint256 public storedValue;
+
+    constructor() {
+        storedValue = 0;
+    }
+
+    function setValue(uint256 _value) public {
+        storedValue = _value;
+    }
+
+    function getValue() public view returns (uint256) {
+        return storedValue;
+    }
+}

crates/anvil-polkadot/tests/it/abi.rs

@@ -0,0 +1,7 @@
+use alloy_sol_types::sol;
+
+sol!(
+    #[derive(Debug)]
+    SimpleStorage,
+    "test-data/SimpleStorage.json"
+);

crates/anvil-polkadot/tests/it/main.rs

@@ -1,3 +1,4 @@
+mod abi;
 mod impersonation;
 mod mining;
 mod standard_rpc;

crates/anvil-polkadot/tests/it/utils.rs

@@ -277,3 +277,26 @@ where
         ResponseResult::Error(err) => Err(err),
     }
 }
+
+#[allow(unused)]
+pub struct ContractCode {
+    pub init: Vec<u8>,
+    pub runtime: Option<Vec<u8>>,
+}
+
+#[allow(unused)]
+pub fn get_contract_code(name: &str) -> ContractCode {
+    let contract_path =
+        std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join(format!("test-data/{name}.json"));
+
+    let contract_json: Value = serde_json::from_reader(std::io::BufReader::new(
+        std::fs::File::open(contract_path).unwrap(),
+    ))
+    .unwrap();
+
+    let init = hex::decode(contract_json.get("bin").unwrap().as_str().unwrap()).unwrap();
+    let runtime =
+        contract_json.get("bin-runtime").map(|code| hex::decode(code.as_str().unwrap()).unwrap());
+
+    ContractCode { init, runtime }
+}