Introduce ERC20 Interface (197-integration-test-for-erc20-wrapper-con…

…tract)

proxy/test_erc20_wrapper_contract.py

@@ -1,11 +1,13 @@
+## File: test_erc20_wrapper_contract.py
+## Integration test for the Neon ERC20 Wrapper contract.
+
 import unittest
 import os
-import pprint
 from web3 import Web3
 from solcx import install_solc
 
 # install_solc(version='latest')
-install_solc(version='0.7.0')
+install_solc(version='0.7.6')
 from solcx import compile_source
 
 EXTRA_GAS = int(os.environ.get("EXTRA_GAS", "0"))
@@ -21,10 +23,27 @@
 # Convert Base58 to hex number:
 TOKEN_MINT = bytes.fromhex('f396da383e57418540f8caa598584f49a3b50d256f75cb6d94d101681d6d9d21')
 
+# Standard interface of ERC20 contract to generate ABI for wrapper
+ERC20_INTERFACE_SOURCE = '''
+pragma solidity >=0.7.0;
+
+interface IERC20 {
+    function decimals() external view returns (uint8);
+    function totalSupply() external view returns (uint256);
+    function balanceOf(address who) external view returns (uint256);
+    function allowance(address owner, address spender) external view returns (uint256);
+    function transfer(address to, uint256 value) external returns (bool);
+    function approve(address spender, uint256 value) external returns (bool);
+    function transferFrom(address from, address to, uint256 value) external returns (bool);
+
+    event Transfer(address indexed from, address indexed to, uint256 value);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+}
+'''
+
 # Copy of contract: https://github.com/neonlabsorg/neon-evm/blob/develop/evm_loader/SPL_ERC20_Wrapper.sol
 ERC20_WRAPPER_SOURCE = '''
-pragma solidity >=0.5.12;
-
+pragma solidity >=0.7.0;
 
 interface IERC20 {
     function decimals() external view returns (uint8);
@@ -38,13 +57,10 @@
     event Transfer(address indexed from, address indexed to, uint256 value);
     event Approval(address indexed owner, address indexed spender, uint256 value);
 
-
     function approveSolana(bytes32 spender, uint64 value) external returns (bool);
     event ApprovalSolana(address indexed owner, bytes32 indexed spender, uint64 value);
 }
 
-
-
 /*abstract*/ contract NeonERC20Wrapper /*is IERC20*/ {
     address constant NeonERC20 = 0xff00000000000000000000000000000000000001;
 
@@ -75,7 +91,6 @@
 }
 '''
 
-
 class Test_erc20_wrapper_contract(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
@@ -85,19 +100,23 @@ def setUpClass(cls):
         cls.deploy_erc20_wrapper_contract(cls)
 
     def deploy_erc20_wrapper_contract(self):
-        compiled_sol = compile_source(ERC20_WRAPPER_SOURCE)
-        contract_id, contract_interface = compiled_sol.popitem()
+        compiled_interface = compile_source(ERC20_INTERFACE_SOURCE)
+        interface_id, interface = compiled_interface.popitem()
+
+        compiled_wrapper = compile_source(ERC20_WRAPPER_SOURCE)
+        wrapper_id, wrapper_interface = compiled_wrapper.popitem()
 
-        erc20 = proxy.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin'])
+        erc20 = proxy.eth.contract(abi=wrapper_interface['abi'], bytecode=wrapper_interface['bin'])
         trx_constructor = erc20.constructor(NAME, SYMBOL, TOKEN_MINT).buildTransaction(
             {'nonce': proxy.eth.get_transaction_count(proxy.eth.default_account)}
         )
         trx_deploy = proxy.eth.account.sign_transaction(trx_constructor, eth_account.key)
-        print('trx_deploy:', trx_deploy)
+        #print('trx_deploy:', trx_deploy)
         trx_deploy_hash = proxy.eth.send_raw_transaction(trx_deploy.rawTransaction)
-        print('trx_deploy_hash:', trx_deploy_hash.hex())
+        #print('trx_deploy_hash:', trx_deploy_hash.hex())
         trx_deploy_receipt = proxy.eth.wait_for_transaction_receipt(trx_deploy_hash)
-        print('trx_deploy_receipt:', trx_deploy_receipt)
+        #print('trx_deploy_receipt:', trx_deploy_receipt)
+        print('deploy status:', trx_deploy_receipt.status)
 
         self.erc20_contract = proxy.eth.contract(
             address=trx_deploy_receipt.contractAddress,
@@ -106,9 +125,7 @@ def deploy_erc20_wrapper_contract(self):
 
     # @unittest.skip("a.i.")
     def test_erc20_name(self):
-        print("\ntest_erc20_name")
         name = self.erc20_contract.functions.name().call()
-        print('name:', name)
         self.assertEqual(name, NAME)
 
     @unittest.skip("a.i.")