From d3d27fedd614040d5c3449da126d00df26d782b3 Mon Sep 17 00:00:00 2001
From: Sai Kumar <sai@umee.cc>
Date: Mon, 17 Jul 2023 20:05:04 +0530
Subject: [PATCH] WIP: add tests for mint BeginBlock

---
 x/mint/module/abci_test.go | 41 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 x/mint/module/abci_test.go

diff --git a/x/mint/module/abci_test.go b/x/mint/module/abci_test.go
new file mode 100644
index 0000000000..c480f3ec6e
--- /dev/null
+++ b/x/mint/module/abci_test.go
@@ -0,0 +1,41 @@
+package mint_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	tmrand "github.com/tendermint/tendermint/libs/rand"
+	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
+	mintmodule "github.com/umee-network/umee/v5/x/mint/module"
+	"gotest.tools/v3/assert"
+
+	umeeapp "github.com/umee-network/umee/v5/app"
+)
+
+func TestBeginBlock(t *testing.T) {
+	app := umeeapp.Setup(t)
+	ctx := app.NewContext(false, tmproto.Header{
+		ChainID: fmt.Sprintf("test-chain-%s", tmrand.Str(4)),
+	})
+
+	// sdk context should start with current time to make sure to update the inflation min and max rate
+	ctx = ctx.WithBlockTime(time.Now())
+
+	oldMintParams := app.MintKeeper.GetParams(ctx)
+	uk := app.UGovKeeperB.Keeper(&ctx)
+	mintmodule.BeginBlock(ctx, uk, app.MintKeeper)
+
+	// inflation min and max rate should change by reduce rate
+	newMintParams := app.MintKeeper.GetParams(ctx)
+	liquidationParams := uk.LiquidationParams()
+	assert.DeepEqual(t,
+		oldMintParams.InflationMax.Mul(sdk.OneDec().Sub(liquidationParams.InflationReductionRate)),
+		newMintParams.InflationMax,
+	)
+	assert.DeepEqual(t,
+		oldMintParams.InflationMin.Mul(sdk.OneDec().Sub(liquidationParams.InflationReductionRate)),
+		newMintParams.InflationMin,
+	)
+}