Implement CalcFeeAmount, Resolve #140

common/fee_test.go

@@ -0,0 +1,29 @@
+package common
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCalcFeeAmount(t *testing.T) {
+	v := big.NewInt(1000)
+	feeAmount := CalcFeeAmount(v, FeeSelector(225)) // 1000%
+	assert.Equal(t, "10000", feeAmount.String())
+
+	feeAmount = CalcFeeAmount(v, FeeSelector(224)) // 100%
+	assert.Equal(t, "1000", feeAmount.String())
+
+	feeAmount = CalcFeeAmount(v, FeeSelector(200)) // 10%
+	assert.Equal(t, "100", feeAmount.String())
+
+	feeAmount = CalcFeeAmount(v, FeeSelector(193)) // 5.11%
+	assert.Equal(t, "51", feeAmount.String())
+
+	feeAmount = CalcFeeAmount(v, FeeSelector(176)) // 1%
+	assert.Equal(t, "10", feeAmount.String())
+
+	feeAmount = CalcFeeAmount(v, FeeSelector(152)) // 0.1%
+	assert.Equal(t, "1", feeAmount.String())
+}