Allow enums to be used as function parameters

ethers.nimble

@@ -4,7 +4,7 @@ description = "library for interacting with Ethereum"
 license = "MIT"
 
 requires "chronos >= 3.0.0 & < 4.0.0"
-requires "contractabi >= 0.4.4 & < 0.5.0"
+requires "contractabi >= 0.4.5 & < 0.5.0"
 requires "questionable >= 0.10.2 & < 0.11.0"
 requires "upraises >= 0.1.0 & < 0.2.0"
 requires "json_rpc"

testmodule/test.nim

@@ -2,6 +2,7 @@ import ./testJsonRpcProvider
 import ./testJsonRpcSigner
 import ./testContracts
 import ./testReturns
+import ./testEnums
 import ./testEvents
 
 {.warning[UnusedImport]:off.}

testmodule/testEnums.nim

@@ -0,0 +1,30 @@
+import pkg/asynctest
+import pkg/ethers
+import ./hardhat
+
+type
+  TestEnums = ref object of Contract
+  SomeEnum = enum
+    One
+    Two
+
+suite "Contract enum parameters and return values":
+
+  var contract: TestEnums
+  var provider: JsonRpcProvider
+  var snapshot: JsonNode
+
+  setup:
+    provider = JsonRpcProvider.new("ws://localhost:8545")
+    snapshot = await provider.send("evm_snapshot")
+    let deployment = readDeployment()
+    contract = TestEnums.new(!deployment.address(TestEnums), provider)
+
+  teardown:
+    discard await provider.send("evm_revert", @[snapshot])
+
+  test "handles enum parameter and return value":
+    proc returnValue(contract: TestEnums,
+                     value: SomeEnum): SomeEnum {.contract, pure.}
+    check (await contract.returnValue(SomeEnum.One)) == SomeEnum.One
+    check (await contract.returnValue(SomeEnum.Two)) == SomeEnum.Two

testnode/contracts/TestEnums.sol

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract TestEnums {
+  enum SomeEnum { One, Two }
+
+  function returnValue(SomeEnum value) external pure returns (SomeEnum) {
+    return value;
+  }
+}

testnode/deploy/testenums.js

@@ -0,0 +1,6 @@
+module.exports = async ({ deployments, getNamedAccounts }) => {
+  const { deployer } = await getNamedAccounts();
+  await deployments.deploy("TestEnums", { from: deployer });
+};
+
+module.exports.tags = ["TestEnums"];