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Add unit test for splitting swap to 100 times to check out amount difference #165

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Aug 7, 2023
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Add unit test for splitting swap to 100 times to check out amount difference #165

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103 changes: 103 additions & 0 deletions x/amm/keeper/msg_server_swap_exact_amount_in_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -196,3 +196,106 @@ func (suite *KeeperTestSuite) TestMsgServerSwapExactAmountIn() {
})
}
}

func (suite *KeeperTestSuite) TestMsgServerSlippageDifferenceWhenSplit() {
suite.SetupTest()
suite.SetupStableCoinPrices()

senderInitBalance := sdk.Coins{sdk.NewInt64Coin("uusdc", 1000000)}
swapFee := sdk.ZeroDec()
tokenIn := sdk.NewInt64Coin("uusdc", 100000)
tokenOutMin := sdk.ZeroInt()
tokenOut := sdk.NewInt64Coin("uusdt", 95454)
swapRoute := []types.SwapAmountInRoute{
{
PoolId: 1,
TokenOutDenom: "uusdt",
},
}
expSenderBalance := sdk.Coins{sdk.NewInt64Coin("uusdc", 900000), sdk.NewInt64Coin("uusdt", 95454)}
expSenderBalanceSplitSwap := sdk.Coins{sdk.NewInt64Coin("uusdc", 900000), sdk.NewInt64Coin("uusdt", 95334)}

// bootstrap accounts
sender := sdk.AccAddress(ed25519.GenPrivKey().PubKey().Address())
poolAddr := sdk.AccAddress(ed25519.GenPrivKey().PubKey().Address())
treasuryAddr := sdk.AccAddress(ed25519.GenPrivKey().PubKey().Address())
poolCoins := sdk.Coins{sdk.NewInt64Coin("uusdc", 1000000), sdk.NewInt64Coin("uusdt", 1000000)}

// bootstrap balances
err := suite.app.BankKeeper.MintCoins(suite.ctx, minttypes.ModuleName, senderInitBalance)
suite.Require().NoError(err)
err = suite.app.BankKeeper.SendCoinsFromModuleToAccount(suite.ctx, minttypes.ModuleName, sender, senderInitBalance)
suite.Require().NoError(err)
err = suite.app.BankKeeper.MintCoins(suite.ctx, minttypes.ModuleName, poolCoins)
suite.Require().NoError(err)
err = suite.app.BankKeeper.SendCoinsFromModuleToAccount(suite.ctx, minttypes.ModuleName, poolAddr, poolCoins)
suite.Require().NoError(err)
// execute function
suite.app.AmmKeeper.SetDenomLiquidity(suite.ctx, types.DenomLiquidity{
Denom: "uusdc",
Liquidity: sdk.NewInt(1000000),
})
suite.app.AmmKeeper.SetDenomLiquidity(suite.ctx, types.DenomLiquidity{
Denom: "uusdt",
Liquidity: sdk.NewInt(1000000),
})

pool := types.Pool{
PoolId: 1,
Address: poolAddr.String(),
RebalanceTreasury: treasuryAddr.String(),
PoolParams: types.PoolParams{
SwapFee: swapFee,
FeeDenom: "uusdc",
UseOracle: true,
SlippageReduction: sdk.NewDecWithPrec(50, 2), // 50%
},
TotalShares: sdk.Coin{},
PoolAssets: []types.PoolAsset{
{
Token: poolCoins[0],
Weight: sdk.NewInt(10),
},
{
Token: poolCoins[1],
Weight: sdk.NewInt(10),
},
},
TotalWeight: sdk.ZeroInt(),
}
suite.app.AmmKeeper.SetPool(suite.ctx, pool)

cacheCtx, _ := suite.ctx.CacheContext()
msgServer := keeper.NewMsgServerImpl(suite.app.AmmKeeper)
resp, err := msgServer.SwapExactAmountIn(
sdk.WrapSDKContext(cacheCtx),
&types.MsgSwapExactAmountIn{
Sender: sender.String(),
Routes: swapRoute,
TokenIn: tokenIn,
TokenOutMinAmount: tokenOutMin,
})
suite.Require().NoError(err)
suite.Require().Equal(resp.TokenOutAmount.String(), tokenOut.Amount.String())

// check balance change on sender
balances := suite.app.BankKeeper.GetAllBalances(cacheCtx, sender)
suite.Require().Equal(balances.String(), expSenderBalance.String())

// execute 100x swap with split
cacheCtx, _ = suite.ctx.CacheContext()
for i := 0; i < 100; i++ {
resp, err = msgServer.SwapExactAmountIn(
sdk.WrapSDKContext(cacheCtx),
&types.MsgSwapExactAmountIn{
Sender: sender.String(),
Routes: swapRoute,
TokenIn: sdk.Coin{Denom: tokenIn.Denom, Amount: tokenIn.Amount.Quo(sdk.NewInt(100))},
TokenOutMinAmount: tokenOutMin,
})
suite.Require().NoError(err)
}
// check balance change on sender after splitting swap to 100
balances = suite.app.BankKeeper.GetAllBalances(cacheCtx, sender)
suite.Require().Equal(balances.String(), expSenderBalanceSplitSwap.String())
}
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