Unit test

ip/network/empty_test.go

@@ -0,0 +1,21 @@
+package network_test
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ipfreely-uk/go/ip"
+	"github.com/ipfreely-uk/go/ip/network"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEmpty(t *testing.T) {
+	empty := network.NewSet[ip.Address4]()
+
+	assert.Equal(t, big.NewInt(0), empty.Size())
+	assert.False(t, empty.Contains(ip.MaxAddress(ip.V4())))
+	ok, _ := empty.Addresses()()
+	assert.False(t, ok)
+	ok, _ = empty.Ranges()()
+	assert.False(t, ok)
+}