chainfee: add new unit SatPerVByte

lnwallet/chainfee/rates_test.go

@@ -0,0 +1,22 @@
+package chainfee
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestSatPerVByteConversion checks that the conversion from sat/vb to either
+// sat/kw or sat/kvb is correct.
+func TestSatPerVByteConversion(t *testing.T) {
+	t.Parallel()
+
+	// Create a test fee rate of 1 sat/vb.
+	rate := SatPerVByte(1)
+
+	// 1 sat/vb should be equal to 1000 sat/kvb.
+	require.Equal(t, SatPerKVByte(1000), rate.FeePerKVByte())
+
+	// 1 sat/vb should be equal to 250 sat/kw.
+	require.Equal(t, SatPerKWeight(250), rate.FeePerKWeight())
+}