[#16] Add pool tests with mock node

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

go.mod

@@ -4,8 +4,15 @@ go 1.16
 
 require (
 	github.com/antlr/antlr4/runtime/Go/antlr v0.0.0-20210521073959-f0d4d129b7f1
+	github.com/golang/mock v1.6.0
+	github.com/google/go-cmp v0.5.4 // indirect
+	github.com/google/uuid v1.2.0
+	github.com/nspcc-dev/neo-go v0.95.3
 	github.com/nspcc-dev/neofs-api-go v1.28.3
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.10.0
-	google.golang.org/grpc v1.29.1
+	golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0 // indirect
+	golang.org/x/text v0.3.4 // indirect
+	google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a // indirect
+	google.golang.org/grpc v1.33.2
 )

go.sum

@@ -52,6 +52,7 @@ github.com/dgraph-io/ristretto v0.0.2-0.20200115201040-8f368f2f2ab3/go.mod h1:KP
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/etcd-io/bbolt v1.3.3/go.mod h1:ZF2nL25h33cCyBtcyWeZ2/I3HQOfTP+0PIEvHjkjCrw=
@@ -69,6 +70,8 @@ github.com/go-yaml/yaml v2.1.0+incompatible/go.mod h1:w2MrLa16VYP0jy6N7M5kHaCkaL
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=
+github.com/golang/mock v1.6.0/go.mod h1:p6yTPP+5HYm5mzsMV8JkE6ZKdX+/wYM6Hr+LicevLPs=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -78,6 +81,7 @@ github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:x
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
 github.com/golang/protobuf v1.4.3 h1:JjCZWpVbqXDqFVmTfYWEVTMIYrL/NPdPSCHPJ0T/raM=
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/snappy v0.0.0-20170215233205-553a64147049/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
@@ -86,11 +90,15 @@ github.com/gomodule/redigo v2.0.0+incompatible/go.mod h1:B4C85qUVwatsJoIUNIfCRsp
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
+github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
-github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.2.0 h1:qJYtXnJRWmpe7m/3XlyhrsLrEURqHRM2kxzoxXqyUDs=
+github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
 github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
@@ -193,13 +201,15 @@ github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/syndtr/goleveldb v0.0.0-20180307113352-169b1b37be73/go.mod h1:Z4AUp2Km+PwemOoO/VB5AOx9XSsIItzFjoJlOSiYmn0=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/virtuald/go-ordered-json v0.0.0-20170621173500-b18e6e673d74/go.mod h1:RmMWU37GKR2s6pgrIEB4ixgpVCt/cf7dnJv3fuH1J1c=
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
+github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 github.com/yuin/gopher-lua v0.0.0-20190514113301-1cd887cd7036/go.mod h1:gqRgreBUhTSL0GeU64rtZ3Uq3wtjOa/TB2YfrtkCbVQ=
 github.com/yuin/gopher-lua v0.0.0-20191128022950-c6266f4fe8d7/go.mod h1:gqRgreBUhTSL0GeU64rtZ3Uq3wtjOa/TB2YfrtkCbVQ=
 go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
@@ -214,12 +224,15 @@ golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0 h1:hb9wdF1z5waM+dSIICn1l0DkLVDT3hqhhQsDNUmHPRE=
+golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -228,13 +241,15 @@ golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 h1:4nGaVu0QrbjT/AK2PRLuQfQuh6DJve+pELhqTdAj3x0=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -251,35 +266,54 @@ golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210510120138-977fb7262007 h1:gG67DSER+11cZvqIMb8S8bt0vZtiN6xWYARwirrOSfE=
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 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
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 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
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+google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
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 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
-google.golang.org/grpc v1.29.1 h1:EC2SB8S04d2r73uptxphDSUG+kTKVgjRPF+N3xpxRB4=
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 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
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+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/abiosoft/ishell.v2 v2.0.0/go.mod h1:sFp+cGtH6o4s1FtpVPTMcHq2yue+c4DGOVohJCPUzwY=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

pkg/pool/pool.go

@@ -19,6 +19,11 @@ import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/session"
 )
 
+// Client is a wrapper for client.Client to generate mock.
+type Client interface {
+	client.Client
+}
+
 // BuilderOptions contains options used to build connection pool.
 type BuilderOptions struct {
 	Key                     *ecdsa.PrivateKey
@@ -28,6 +33,7 @@ type BuilderOptions struct {
 	SessionExpirationEpoch  uint64
 	weights                 []float64
 	addresses               []string
+	clientBuilder           func(opts ...client.Option) (client.Client, error)
 }
 
 // Builder is an interim structure used to collect node addresses/weights and
@@ -66,6 +72,11 @@ func (pb *Builder) Build(ctx context.Context, options *BuilderOptions) (Pool, er
 
 	options.weights = adjustWeights(pb.weights)
 	options.addresses = pb.addresses
+
+	if options.clientBuilder == nil {
+		options.clientBuilder = client.New
+	}
+
 	return newPool(ctx, options)
 }
 
@@ -96,7 +107,7 @@ type pool struct {
 func newPool(ctx context.Context, options *BuilderOptions) (Pool, error) {
 	clientPacks := make([]*clientPack, len(options.weights))
 	for i, address := range options.addresses {
-		c, err := client.New(client.WithDefaultPrivateKey(options.Key),
+		c, err := options.clientBuilder(client.WithDefaultPrivateKey(options.Key),
 			client.WithURIAddress(address, nil),
 			client.WithDialTimeout(options.NodeConnectionTimeout))
 		if err != nil {
@@ -139,10 +150,15 @@ func startRebalance(ctx context.Context, p *pool, options *BuilderOptions) {
 	ticker := time.NewTimer(options.ClientRebalanceInterval)
 	buffer := make([]float64, len(options.weights))
 
-	for range ticker.C {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
 			updateNodesHealth(ctx, p, options, buffer)
 			ticker.Reset(options.ClientRebalanceInterval)
 		}
+	}
 }
 
 func updateNodesHealth(ctx context.Context, p *pool, options *BuilderOptions, bufferWeights []float64) {

pkg/pool/pool_test.go

@@ -0,0 +1,314 @@
+package pool
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/golang/mock/gomock"
+	"github.com/google/uuid"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neofs-api-go/pkg/client"
+	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
+	"github.com/nspcc-dev/neofs-api-go/pkg/session"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBuildPoolClientFailed(t *testing.T) {
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	clientBuilder := func(opts ...client.Option) (client.Client, error) {
+		return nil, fmt.Errorf("error")
+	}
+
+	pb := new(Builder)
+	pb.AddNode("peer0", 1)
+
+	opts := &BuilderOptions{
+		Key:           &key.PrivateKey,
+		clientBuilder: clientBuilder,
+	}
+
+	_, err = pb.Build(context.TODO(), opts)
+	require.Error(t, err)
+}
+
+func TestBuildPoolCreateSessionFailed(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	ni := &netmap.NodeInfo{}
+	ni.SetAddresses("addr1", "addr2")
+
+	clientBuilder := func(opts ...client.Option) (client.Client, error) {
+		mockClient := NewMockClient(ctrl)
+		mockClient.EXPECT().CreateSession(gomock.Any(), gomock.Any()).Return(nil, fmt.Errorf("error session"))
+		mockClient.EXPECT().EndpointInfo(gomock.Any(), gomock.Any()).Return(&client.EndpointInfo{}, nil)
+		return mockClient, nil
+	}
+
+	pb := new(Builder)
+	pb.AddNode("peer0", 1)
+
+	opts := &BuilderOptions{
+		Key:           &key.PrivateKey,
+		clientBuilder: clientBuilder,
+	}
+
+	_, err = pb.Build(context.TODO(), opts)
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "client []: error session")
+}
+
+func TestBuildPoolZeroNodes(t *testing.T) {
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	pb := new(Builder)
+	opts := &BuilderOptions{
+		Key: &key.PrivateKey,
+	}
+	_, err = pb.Build(context.TODO(), opts)
+	require.Error(t, err)
+}
+
+func TestOneNode(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	tok := session.NewToken()
+	uid, err := uuid.New().MarshalBinary()
+	require.NoError(t, err)
+	tok.SetID(uid)
+
+	clientBuilder := func(opts ...client.Option) (client.Client, error) {
+		mockClient := NewMockClient(ctrl)
+		mockClient.EXPECT().CreateSession(gomock.Any(), gomock.Any()).Return(tok, nil)
+		return mockClient, nil
+	}
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	pb := new(Builder)
+	pb.AddNode("peer0", 1)
+
+	opts := &BuilderOptions{
+		Key:           &key.PrivateKey,
+		clientBuilder: clientBuilder,
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	pool, err := pb.Build(ctx, opts)
+	require.NoError(t, err)
+
+	_, st, err := pool.Connection()
+	require.NoError(t, err)
+	require.Equal(t, tok, st)
+}
+
+func TestTwoNodes(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	var tokens []*session.Token
+	clientBuilder := func(opts ...client.Option) (client.Client, error) {
+		mockClient := NewMockClient(ctrl)
+		mockClient.EXPECT().CreateSession(gomock.Any(), gomock.Any()).DoAndReturn(func(_, _ interface{}, _ ...interface{}) (*session.Token, error) {
+			tok := session.NewToken()
+			uid, err := uuid.New().MarshalBinary()
+			require.NoError(t, err)
+			tok.SetID(uid)
+			tokens = append(tokens, tok)
+			return tok, err
+		})
+		return mockClient, nil
+	}
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	pb := new(Builder)
+	pb.AddNode("peer0", 1)
+	pb.AddNode("peer1", 1)
+
+	opts := &BuilderOptions{
+		Key:           &key.PrivateKey,
+		clientBuilder: clientBuilder,
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	pool, err := pb.Build(ctx, opts)
+	require.NoError(t, err)
+
+	_, st, err := pool.Connection()
+	require.NoError(t, err)
+	require.Contains(t, tokens, st)
+}
+
+func TestOneOfTwoFailed(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	ctrl2 := gomock.NewController(t)
+	defer ctrl2.Finish()
+
+	var tokens []*session.Token
+	clientCount := -1
+	clientBuilder := func(opts ...client.Option) (client.Client, error) {
+		clientCount++
+		mockClient := NewMockClient(ctrl)
+		mockClient.EXPECT().CreateSession(gomock.Any(), gomock.Any(), gomock.Any()).DoAndReturn(func(_, _ interface{}, _ ...interface{}) (*session.Token, error) {
+			tok := newToken(t)
+			tokens = append(tokens, tok)
+			return tok, nil
+		}).AnyTimes()
+		mockClient.EXPECT().EndpointInfo(gomock.Any(), gomock.Any()).Return(nil, nil).AnyTimes()
+
+		mockClient2 := NewMockClient(ctrl2)
+		mockClient2.EXPECT().CreateSession(gomock.Any(), gomock.Any()).DoAndReturn(func(_, _ interface{}, _ ...interface{}) (*session.Token, error) {
+			tok := newToken(t)
+			tokens = append(tokens, tok)
+			return tok, nil
+		}).AnyTimes()
+		mockClient2.EXPECT().EndpointInfo(gomock.Any(), gomock.Any()).DoAndReturn(func(_ interface{}, _ ...interface{}) (*client.EndpointInfo, error) {
+			return nil, fmt.Errorf("error")
+		}).AnyTimes()
+
+		if clientCount == 0 {
+			return mockClient, nil
+		}
+		return mockClient2, nil
+	}
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	pb := new(Builder)
+	pb.AddNode("peer0", 1)
+	pb.AddNode("peer1", 9)
+
+	opts := &BuilderOptions{
+		Key:                     &key.PrivateKey,
+		clientBuilder:           clientBuilder,
+		ClientRebalanceInterval: 200 * time.Millisecond,
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	pool, err := pb.Build(ctx, opts)
+	require.NoError(t, err)
+
+	time.Sleep(2 * time.Second)
+
+	for i := 0; i < 5; i++ {
+		_, st, err := pool.Connection()
+		require.NoError(t, err)
+		require.Equal(t, tokens[0], st)
+	}
+}
+
+func TestTwoFailed(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	clientBuilder := func(opts ...client.Option) (client.Client, error) {
+		mockClient := NewMockClient(ctrl)
+		mockClient.EXPECT().CreateSession(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil, nil).AnyTimes()
+		mockClient.EXPECT().EndpointInfo(gomock.Any(), gomock.Any()).Return(nil, fmt.Errorf("error")).AnyTimes()
+		return mockClient, nil
+	}
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	pb := new(Builder)
+	pb.AddNode("peer0", 1)
+	pb.AddNode("peer1", 1)
+
+	opts := &BuilderOptions{
+		Key:                     &key.PrivateKey,
+		clientBuilder:           clientBuilder,
+		ClientRebalanceInterval: 200 * time.Millisecond,
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	pool, err := pb.Build(ctx, opts)
+	require.NoError(t, err)
+
+	time.Sleep(2 * time.Second)
+
+	_, _, err = pool.Connection()
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "no healthy")
+}
+
+func newToken(t *testing.T) *session.Token {
+	tok := session.NewToken()
+	uid, err := uuid.New().MarshalBinary()
+	require.NoError(t, err)
+	tok.SetID(uid)
+
+	return tok
+}
+
+func TestWaitPresence(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	mockClient := NewMockClient(ctrl)
+	mockClient.EXPECT().CreateSession(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil, nil).AnyTimes()
+	mockClient.EXPECT().EndpointInfo(gomock.Any(), gomock.Any()).Return(nil, nil).AnyTimes()
+	mockClient.EXPECT().GetContainer(gomock.Any(), gomock.Any(), gomock.Any()).Return(nil, nil).AnyTimes()
+
+	p := &pool{
+		sampler: NewSampler([]float64{1}, rand.NewSource(0)),
+		clientPacks: []*clientPack{{
+			client:  mockClient,
+			healthy: true,
+		}},
+	}
+
+	t.Run("context canceled", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.Background())
+		go func() {
+			time.Sleep(500 * time.Millisecond)
+			cancel()
+		}()
+
+		err := p.WaitForContainerPresence(ctx, nil, DefaultPollingParams())
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "context canceled")
+	})
+
+	t.Run("context deadline exceeded", func(t *testing.T) {
+		ctx := context.Background()
+		err := p.WaitForContainerPresence(ctx, nil, &ContainerPollingParams{
+			CreationTimeout: 500 * time.Millisecond,
+			PollInterval:    5 * time.Second,
+		})
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "context deadline exceeded")
+	})
+
+	t.Run("ok", func(t *testing.T) {
+		ctx := context.Background()
+		err := p.WaitForContainerPresence(ctx, nil, &ContainerPollingParams{
+			CreationTimeout: 10 * time.Second,
+			PollInterval:    500 * time.Millisecond,
+		})
+		require.NoError(t, err)
+	})
+}