Add support for ipv6 subnet in ipStrategy

pkg/config/dynamic/middleware_test.go

@@ -0,0 +1,57 @@
+package dynamic
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_GetStrategy_ipv6Subnet(t *testing.T) {
+	testCases := []struct {
+		desc        string
+		expectError bool
+		ipv6Subnet  *int
+	}{
+		{
+			desc: "Nil subnet",
+		},
+		{
+			desc:        "Zero subnet",
+			expectError: true,
+			ipv6Subnet:  intPtr(0),
+		},
+		{
+			desc:        "Subnet greater that 128",
+			expectError: true,
+			ipv6Subnet:  intPtr(129),
+		},
+		{
+			desc:       "Valid subnet",
+			ipv6Subnet: intPtr(128),
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			strategy := IPStrategy{
+				IPv6Subnet: test.ipv6Subnet,
+			}
+
+			get, err := strategy.Get()
+			if test.expectError {
+				require.Error(t, err)
+				assert.Nil(t, get)
+			} else {
+				require.NoError(t, err)
+				assert.NotNil(t, get)
+			}
+		})
+	}
+}
+
+func intPtr(value int) *int {
+	return &value
+}