Accually add tests

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

chain/store/basefee_test.go

@@ -0,0 +1,34 @@
+package store
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/filecoin-project/lotus/build"
+	"github.com/filecoin-project/lotus/chain/types"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBaseFee(t *testing.T) {
+	tests := []struct {
+		basefee    uint64
+		limitUsed  int64
+		noOfBlocks int
+		output     uint64
+	}{
+		{100e6, 0, 1, 87.5e6},
+		{100e6, 0, 5, 87.5e6},
+		{100e6, build.BlockGasTarget, 1, 100e6},
+		{100e6, build.BlockGasTarget * 2, 2, 100e6},
+		{100e6, build.BlockGasLimit * 2, 2, 112.5e6},
+		{100e6, build.BlockGasLimit * 1.5, 2, 106.25e6},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(fmt.Sprintf("%v", test), func(t *testing.T) {
+			output := computeNextBaseFee(types.NewInt(test.basefee), test.limitUsed, test.noOfBlocks)
+			assert.Equal(t, fmt.Sprintf("%d", test.output), output.String())
+		})
+	}
+}

node/impl/full/gas.go

@@ -34,7 +34,7 @@ func (a *GasAPI) GasEstimateFeeCap(ctx context.Context, maxqueueblks int64,
 	ts := a.Chain.GetHeaviestTipSet()
 
 	parentBaseFee := ts.Blocks()[0].ParentBaseFee
-	increaseFactor := math.Pow(1+1/build.BaseFeeMaxChangeDenom, BaseFeeEstimNBlocks)
+	increaseFactor := math.Pow(1+float64(1/build.BaseFeeMaxChangeDenom), BaseFeeEstimNBlocks)
 
 	out := types.BigMul(parentBaseFee, types.NewInt(uint64(increaseFactor*(1<<8))))
 	out = types.BigDiv(out, types.NewInt(1<<8))