fix(test): avoid mutation of global int256 variable

tests/integration/x/erc20/test_dynamic_precompiles.go

@@ -111,7 +111,7 @@ func (s *KeeperTestSuite) TestRegisterERC20CodeHash() {
 			s.Require().Equal(nonce, acc.Nonce)
 			if tc.vesting {
 				totalBalance = s.network.App.GetBankKeeper().GetBalance(ctx, account.Bytes(), s.network.GetBaseDenom()).Amount
-				s.Require().Equal(totalBalance.BigInt(), common.U2560.Add(balance, balance).ToBig())
+				s.Require().Equal(totalBalance.BigInt(), uint256.NewInt(0).Add(balance, balance).ToBig())
 			}
 		} else {
 			s.Require().Equal(common.U2560, acc.Balance)
@@ -128,7 +128,7 @@ func (s *KeeperTestSuite) TestRegisterERC20CodeHash() {
 			s.Require().Equal(nonce, acc.Nonce)
 			if tc.vesting {
 				totalBalance = s.network.App.GetBankKeeper().GetBalance(ctx, account.Bytes(), s.network.GetBaseDenom()).Amount
-				s.Require().Equal(totalBalance.BigInt(), common.U2560.Add(balance, balance).ToBig())
+				s.Require().Equal(totalBalance.BigInt(), uint256.NewInt(0).Add(balance, balance).ToBig())
 			}
 		} else {
 			s.Require().Equal(common.U2560, acc.Balance)

tests/integration/x/precisebank/test_genesis.go

@@ -48,29 +48,6 @@ func (s *GenesisTestSuite) SetupTestWithChainID(chainID testconstants.ChainID) {
 	})
 }
 
-func (s *GenesisTestSuite) adjustModuleBalance(expectedAmt sdkmath.Int) {
-	moduleAddr := s.network.App.GetAccountKeeper().GetModuleAddress(types.ModuleName)
-	balance := s.network.App.GetBankKeeper().GetBalance(s.network.GetContext(), moduleAddr, types.IntegerCoinDenom())
-
-	if balance.Amount.GT(expectedAmt) {
-		// Burn excess
-		err := s.network.App.GetBankKeeper().BurnCoins(
-			s.network.GetContext(),
-			types.ModuleName,
-			sdk.NewCoins(sdk.NewCoin(types.IntegerCoinDenom(), balance.Amount.Sub(expectedAmt))),
-		)
-		s.Require().NoError(err)
-	} else if balance.Amount.LT(expectedAmt) {
-		// Mint deficit
-		err := s.network.App.GetBankKeeper().MintCoins(
-			s.network.GetContext(),
-			types.ModuleName,
-			sdk.NewCoins(sdk.NewCoin(types.IntegerCoinDenom(), expectedAmt.Sub(balance.Amount))),
-		)
-		s.Require().NoError(err)
-	}
-}
-
 func (s *GenesisTestSuite) TestInitGenesis() {
 	tests := []struct {
 		name         string
@@ -93,9 +70,13 @@ func (s *GenesisTestSuite) TestInitGenesis() {
 		{
 			"valid - module balance matches non-zero amount",
 			func() {
-				// The network setup creates an initial balance of 1, so we need to mint 1 more
-				// to get to the expected amount of 2 for this test case
-				s.adjustModuleBalance(sdkmath.NewInt(2))
+				// Mint the expected amount of 2 integer coins to back the fractional balances
+				err := s.network.App.GetBankKeeper().MintCoins(
+					s.network.GetContext(),
+					types.ModuleName,
+					sdk.NewCoins(sdk.NewCoin(types.IntegerCoinDenom(), sdkmath.NewInt(2))),
+				)
+				s.Require().NoError(err)
 			},
 			types.NewGenesisState(
 				types.FractionalBalances{
@@ -123,9 +104,17 @@ func (s *GenesisTestSuite) TestInitGenesis() {
 		{
 			"invalid - module balance insufficient",
 			func() {
-				// The network setup creates an initial balance of 1, so we need to burn that
-				// to get to 0 balance for this test case
-				s.adjustModuleBalance(sdkmath.ZeroInt())
+				// Ensure module account has 0 balance
+				moduleAddr := s.network.App.GetAccountKeeper().GetModuleAddress(types.ModuleName)
+				existingBalance := s.network.App.GetBankKeeper().GetBalance(s.network.GetContext(), moduleAddr, types.IntegerCoinDenom())
+				if existingBalance.IsPositive() {
+					err := s.network.App.GetBankKeeper().BurnCoins(
+						s.network.GetContext(),
+						types.ModuleName,
+						sdk.NewCoins(existingBalance),
+					)
+					s.Require().NoError(err)
+				}
 			},
 			types.NewGenesisState(
 				types.FractionalBalances{
@@ -141,9 +130,13 @@ func (s *GenesisTestSuite) TestInitGenesis() {
 		{
 			"invalid - module balance excessive",
 			func() {
-				// The network setup creates an initial balance of 1, so we need to mint 99 more
-				// to get to 100 total balance for this test case
-				s.adjustModuleBalance(sdkmath.NewInt(100))
+				// Mint 100 integer coins (excessive for expected 2)
+				err := s.network.App.GetBankKeeper().MintCoins(
+					s.network.GetContext(),
+					types.ModuleName,
+					sdk.NewCoins(sdk.NewCoin(types.IntegerCoinDenom(), sdkmath.NewInt(100))),
+				)
+				s.Require().NoError(err)
 			},
 			types.NewGenesisState(
 				types.FractionalBalances{
@@ -242,8 +235,13 @@ func (s *GenesisTestSuite) TestExportGenesis() {
 		{
 			"balances, no remainder",
 			func() *types.GenesisState {
-				// Burn the initial balance created by network setup, then mint the expected amount
-				s.adjustModuleBalance(sdkmath.NewInt(1))
+				// Mint the expected amount to back the fractional balances
+				err := s.network.App.GetBankKeeper().MintCoins(
+					s.network.GetContext(),
+					types.ModuleName,
+					sdk.NewCoins(sdk.NewCoin(types.IntegerCoinDenom(), sdkmath.NewInt(1))),
+				)
+				s.Require().NoError(err)
 
 				return types.NewGenesisState(
 					types.FractionalBalances{
@@ -257,8 +255,13 @@ func (s *GenesisTestSuite) TestExportGenesis() {
 		{
 			"balances, remainder",
 			func() *types.GenesisState {
-				// Burn the initial balance created by network setup, then mint the expected amount
-				s.adjustModuleBalance(sdkmath.NewInt(1))
+				// Mint the expected amount to back the fractional balances
+				err := s.network.App.GetBankKeeper().MintCoins(
+					s.network.GetContext(),
+					types.ModuleName,
+					sdk.NewCoins(sdk.NewCoin(types.IntegerCoinDenom(), sdkmath.NewInt(1))),
+				)
+				s.Require().NoError(err)
 
 				return types.NewGenesisState(
 					types.FractionalBalances{

tests/integration/x/precisebank/test_view_integration.go

@@ -139,9 +139,9 @@ func (s *KeeperIntegrationTestSuite) TestKeeperHiddenReserve() {
 	// Check underlying x/bank balance for reserve
 	reserveIntCoin := s.network.App.GetBankKeeper().GetBalance(s.network.GetContext(), moduleAddr, types.IntegerCoinDenom())
 	s.Require().Equal(
-		sdkmath.NewInt(2), // Network setup creates 1, test mints 1 more = 2 total
+		sdkmath.NewInt(1),
 		reserveIntCoin.Amount,
-		"reserve should hold 2 integer coins (1 from network setup + 1 from test mint)",
+		"reserve should hold 1 integer coin from test mint",
 	)
 
 	tests := []struct {
@@ -160,7 +160,7 @@ func (s *KeeperIntegrationTestSuite) TestKeeperHiddenReserve() {
 			"reserve account - visible integer denom",
 			moduleAddr,
 			types.IntegerCoinDenom(),
-			sdkmath.NewInt(2), // Network setup creates 1, test mints 1 more = 2 total
+			sdkmath.NewInt(1), // 1 integer coin from test mint
 		},
 		{
 			"user account - visible extended denom",

tests/integration/x/vm/test_statedb.go

@@ -984,7 +984,7 @@ func (s *KeeperTestSuite) TestSetBalance() {
 			},
 			false,
 			func() *uint256.Int {
-				return common.U2560.Add(totalBalance, amount)
+				return uint256.NewInt(0).Add(totalBalance, amount)
 			},
 		},
 		{