[#480] Add fuzzing tests

Signed-off-by: Roman Ognev <r.ognev@yadro.com>

api/handler/handlers_test.go

@@ -33,13 +33,16 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
-	"go.uber.org/zap/zaptest"
 	"golang.org/x/exp/slices"
 )
 
 type handlerContext struct {
+	*handlerContextBase
+	t *testing.T
+}
+
+type handlerContextBase struct {
 	owner   user.ID
-	t       *testing.T
 	h       *handler
 	tp      *layer.TestFrostFS
 	tree    *tree.Tree
@@ -51,19 +54,19 @@ type handlerContext struct {
 	cache         *layer.Cache
 }
 
-func (hc *handlerContext) Handler() *handler {
+func (hc *handlerContextBase) Handler() *handler {
 	return hc.h
 }
 
-func (hc *handlerContext) MockedPool() *layer.TestFrostFS {
+func (hc *handlerContextBase) MockedPool() *layer.TestFrostFS {
 	return hc.tp
 }
 
-func (hc *handlerContext) Layer() *layer.Layer {
+func (hc *handlerContextBase) Layer() *layer.Layer {
 	return hc.h.obj
 }
 
-func (hc *handlerContext) Context() context.Context {
+func (hc *handlerContextBase) Context() context.Context {
 	return hc.context
 }
 
@@ -137,19 +140,30 @@ func (c *configMock) RetryStrategy() RetryStrategy {
 }
 
 func prepareHandlerContext(t *testing.T) *handlerContext {
-	log := zaptest.NewLogger(t)
-	return prepareHandlerContextBase(t, layer.DefaultCachesConfigs(log), log)
+	hc, err := prepareHandlerContextBase(layer.DefaultCachesConfigs(zap.NewExample()))
+	require.NoError(t, err)
+	return &handlerContext{
+		handlerContextBase: hc,
+		t:                  t,
+	}
 }
 
 func prepareHandlerContextWithMinCache(t *testing.T) *handlerContext {
-	log := zaptest.NewLogger(t)
-	return prepareHandlerContextBase(t, getMinCacheConfig(log), log)
+	hc, err := prepareHandlerContextBase(getMinCacheConfig(zap.NewExample()))
+	require.NoError(t, err)
+	return &handlerContext{
+		handlerContextBase: hc,
+		t:                  t,
+	}
 }
 
-func prepareHandlerContextBase(t *testing.T, cacheCfg *layer.CachesConfig, log *zap.Logger) *handlerContext {
+func prepareHandlerContextBase(cacheCfg *layer.CachesConfig) (*handlerContextBase, error) {
 	key, err := keys.NewPrivateKey()
-	require.NoError(t, err)
+	if err != nil {
+		return nil, err
+	}
 
+	log := zap.NewExample()
 	tp := layer.NewTestFrostFS(key)
 
 	testResolver := &resolver.Resolver{Name: "test_resolver"}
@@ -161,9 +175,11 @@ func prepareHandlerContextBase(t *testing.T, cacheCfg *layer.CachesConfig, log *
 	user.IDFromKey(&owner, key.PrivateKey.PublicKey)
 
 	memCli, err := tree.NewTreeServiceClientMemory()
-	require.NoError(t, err)
+	if err != nil {
+		return nil, err
+	}
 
-	treeMock := tree.NewTree(memCli, log)
+	treeMock := tree.NewTree(memCli, zap.NewExample())
 
 	features := &layer.FeatureSettingsMock{}
 
@@ -178,7 +194,9 @@ func prepareHandlerContextBase(t *testing.T, cacheCfg *layer.CachesConfig, log *
 
 	var pp netmap.PlacementPolicy
 	err = pp.DecodeString("REP 1")
-	require.NoError(t, err)
+	if err != nil {
+		return nil, err
+	}
 
 	cfg := &configMock{
 		defaultPolicy: pp,
@@ -191,19 +209,23 @@ func prepareHandlerContextBase(t *testing.T, cacheCfg *layer.CachesConfig, log *
 		frostfsid: newFrostfsIDMock(),
 	}
 
-	return &handlerContext{
+	accessBox, err := newTestAccessBox(key)
+	if err != nil {
+		return nil, err
+	}
+
+	return &handlerContextBase{
 		owner:   owner,
-		t:       t,
 		h:       h,
 		tp:      tp,
 		tree:    treeMock,
-		context: middleware.SetBox(context.Background(), &middleware.Box{AccessBox: newTestAccessBox(t, key)}),
+		context: middleware.SetBox(context.Background(), &middleware.Box{AccessBox: accessBox}),
 		config:  cfg,
 
 		layerFeatures: features,
 		treeMock:      memCli,
 		cache:         layerCfg.Cache,
-	}
+	}, nil
 }
 
 func getMinCacheConfig(logger *zap.Logger) *layer.CachesConfig {