all: assert internal objects implement interfaces

plugins/ipam/host-local/backend/disk/backend.go

@@ -20,6 +20,8 @@ import (
 	"net"
 	"os"
 	"path/filepath"
+
+	"github.com/containernetworking/cni/plugins/ipam/host-local/backend"
 )
 
 const lastIPFile = "last_reserved_ip"
@@ -31,6 +33,9 @@ type Store struct {
 	dataDir string
 }
 
+// Store implements the Store interface
+var _ backend.Store = &Store{}
+
 func New(network, dataDir string) (*Store, error) {
 	if dataDir == "" {
 		dataDir = defaultDataDir

plugins/ipam/host-local/backend/testing/fake_store.go

@@ -16,6 +16,8 @@ package testing
 
 import (
 	"net"
+
+	"github.com/containernetworking/cni/plugins/ipam/host-local/backend"
 )
 
 type FakeStore struct {
@@ -23,6 +25,9 @@ type FakeStore struct {
 	lastReservedIP net.IP
 }
 
+// FakeStore implements the Store interface
+var _ backend.Store = &FakeStore{}
+
 func NewFakeStore(ipmap map[string]string, lastIP net.IP) *FakeStore {
 	return &FakeStore{ipmap, lastIP}
 }