From b639e367c0d51dfe23e0555f95e5d619ecae1396 Mon Sep 17 00:00:00 2001
From: Mark Spanbroek <mark@spanbroek.net>
Date: Tue, 25 Jan 2022 15:05:54 +0100
Subject: [PATCH] Reset EVM in between tests

---
 ethers/providers/jsonrpc.nim | 4 ++--
 testmodule/testContracts.nim | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/ethers/providers/jsonrpc.nim b/ethers/providers/jsonrpc.nim
index 19412d8..9c95e29 100644
--- a/ethers/providers/jsonrpc.nim
+++ b/ethers/providers/jsonrpc.nim
@@ -41,9 +41,9 @@ proc new*(_: type JsonRpcProvider, url=defaultUrl): JsonRpcProvider =
 
 proc send*(provider: JsonRpcProvider,
            call: string,
-           arguments = %(@[])): Future[JsonNode] {.async.} =
+           arguments: seq[JsonNode] = @[]): Future[JsonNode] {.async.} =
   let client = await provider.client
-  return await client.call(call, arguments)
+  return await client.call(call, %arguments)
 
 proc listAccounts*(provider: JsonRpcProvider): Future[seq[Address]] {.async.} =
   let client = await provider.client
diff --git a/testmodule/testContracts.nim b/testmodule/testContracts.nim
index 144be6f..bb655ec 100644
--- a/testmodule/testContracts.nim
+++ b/testmodule/testContracts.nim
@@ -1,3 +1,4 @@
+import std/json
 import pkg/asynctest
 import pkg/stint
 import pkg/ethers
@@ -15,12 +16,17 @@ suite "Contracts":
 
   var token: TestToken
   var provider: JsonRpcProvider
+  var snapshot: JsonNode
 
   setup:
     provider = JsonRpcProvider.new()
+    snapshot = await provider.send("evm_snapshot")
     let deployment = readDeployment()
     token = TestToken.new(!deployment.address(TestToken), provider)
 
+  teardown:
+    discard await provider.send("evm_revert", @[snapshot])
+
   test "can call view methods":
     let accounts = await provider.listAccounts()
     check (await token.totalSupply()) == 0.u256