app/ante/fees.go

@@ -32,8 +32,8 @@ func (mpd MinGasPriceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate
 
 	minGasPrice := mpd.feesKeeper.GetParams(ctx).MinGasPrice
 
-	// short-circuit if min gas price is 0
-	if minGasPrice.IsZero() {
+	// Short-circuit if min gas price is 0 or if simulating
+	if minGasPrice.IsZero() || simulate {
 		return next(ctx, tx, simulate)
 	}
 

app/ante/fees_test.go

@@ -34,6 +34,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 		malleate            func() sdk.Tx
 		expPass             bool
 		errMsg              string
+		allowPassOnSimulate bool
 	}{
 		{
 			"invalid cosmos tx type",
@@ -42,6 +43,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 			},
 			false,
 			"must be a FeeTx",
+			false,
 		},
 		{
 			"valid cosmos tx with MinGasPrices = 0, gasPrice = 0",
@@ -55,6 +57,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 			},
 			true,
 			"",
+			false,
 		},
 		{
 			"valid cosmos tx with MinGasPrices = 0, gasPrice > 0",
@@ -68,6 +71,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 			},
 			true,
 			"",
+			false,
 		},
 		{
 			"valid cosmos tx with MinGasPrices = 10, gasPrice = 10",
@@ -81,6 +85,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 			},
 			true,
 			"",
+			false,
 		},
 		{
 			"invalid cosmos tx with MinGasPrices = 10, gasPrice = 0",
@@ -94,6 +99,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 			},
 			false,
 			"provided fee < minimum global fee",
+			true,
 		},
 		{
 			"invalid cosmos tx with wrong denom",
@@ -107,6 +113,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 			},
 			false,
 			"provided fee < minimum global fee",
+			true,
 		},
 	}
 
@@ -118,7 +125,7 @@ func (s AnteTestSuite) TestMinGasPriceDecorator() {
 				dec := ante.NewMinGasPriceDecorator(s.app.FeeMarketKeeper, s.app.EvmKeeper)
 				_, err := dec.AnteHandle(ctx, tc.malleate(), et.simulate, NextFn)
 
-				if tc.expPass {
+				if tc.expPass || (et.simulate && tc.allowPassOnSimulate) {
 					s.Require().NoError(err, tc.name)
 				} else {
 					s.Require().Error(err, tc.name)