diff --git a/internal/rand.go b/internal/rand.go
new file mode 100644
index 00000000..23ab1a79
--- /dev/null
+++ b/internal/rand.go
@@ -0,0 +1,12 @@
+package internal
+
+import (
+	"math/rand"
+	"time"
+)
+
+// RandUint32 returns random uint32 value [0, max).
+func RandUint32(max uint32) uint32 {
+	rand.Seed(time.Now().UnixNano())
+	return rand.Uint32() % max
+}
diff --git a/object/test/generate.go b/object/test/generate.go
index 215ff78e..22646f75 100644
--- a/object/test/generate.go
+++ b/object/test/generate.go
@@ -1,6 +1,7 @@
 package objecttest
 
 import (
+	"github.com/nspcc-dev/neofs-api-go/v2/internal"
 	"github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	refstest "github.com/nspcc-dev/neofs-api-go/v2/refs/test"
@@ -185,7 +186,14 @@ func GenerateGetResponseBody(empty bool) *object.GetResponseBody {
 	m := new(object.GetResponseBody)
 
 	if !empty {
-		m.SetObjectPart(GenerateGetObjectPartInit(false))
+		switch internal.RandUint32(3) {
+		case 0:
+			m.SetObjectPart(GenerateGetObjectPartInit(false))
+		case 1:
+			m.SetObjectPart(GenerateGetObjectPartChunk(false))
+		case 2:
+			m.SetObjectPart(GenerateSplitInfo(false))
+		}
 	}
 
 	return m
@@ -232,7 +240,12 @@ func GeneratePutRequestBody(empty bool) *object.PutRequestBody {
 	m := new(object.PutRequestBody)
 
 	if !empty {
-		m.SetObjectPart(GeneratePutObjectPartInit(false))
+		switch internal.RandUint32(2) {
+		case 0:
+			m.SetObjectPart(GeneratePutObjectPartInit(false))
+		case 1:
+			m.SetObjectPart(GeneratePutObjectPartChunk(false))
+		}
 	}
 
 	return m
@@ -349,7 +362,14 @@ func GenerateHeadResponseBody(empty bool) *object.HeadResponseBody {
 	m := new(object.HeadResponseBody)
 
 	if !empty {
-		m.SetHeaderPart(GenerateHeaderWithSignature(false))
+		switch internal.RandUint32(3) {
+		case 0:
+			m.SetHeaderPart(GenerateHeaderWithSignature(false))
+		case 1:
+			m.SetHeaderPart(GenerateShortHeader(false))
+		case 2:
+			m.SetHeaderPart(GenerateSplitInfo(false))
+		}
 	}
 
 	return m
@@ -504,7 +524,12 @@ func GenerateGetRangeResponseBody(empty bool) *object.GetRangeResponseBody {
 	m := new(object.GetRangeResponseBody)
 
 	if !empty {
-		m.SetRangePart(GenerateGetRangePartChunk(false))
+		switch internal.RandUint32(2) {
+		case 0:
+			m.SetRangePart(GenerateGetRangePartChunk(false))
+		case 1:
+			m.SetRangePart(GenerateSplitInfo(false))
+		}
 	}
 
 	return m
diff --git a/session/test/generate.go b/session/test/generate.go
index be7cd5fc..e040b817 100644
--- a/session/test/generate.go
+++ b/session/test/generate.go
@@ -2,6 +2,7 @@ package sessiontest
 
 import (
 	acltest "github.com/nspcc-dev/neofs-api-go/v2/acl/test"
+	"github.com/nspcc-dev/neofs-api-go/v2/internal"
 	refstest "github.com/nspcc-dev/neofs-api-go/v2/refs/test"
 	"github.com/nspcc-dev/neofs-api-go/v2/session"
 	statustest "github.com/nspcc-dev/neofs-api-go/v2/status/test"
@@ -165,7 +166,13 @@ func GenerateSessionTokenBody(empty bool) *session.TokenBody {
 		m.SetSessionKey([]byte{2})
 		m.SetOwnerID(refstest.GenerateOwnerID(false))
 		m.SetLifetime(GenerateTokenLifetime(false))
-		m.SetContext(GenerateObjectSessionContext(false))
+
+		switch internal.RandUint32(2) {
+		case 0:
+			m.SetContext(GenerateObjectSessionContext(false))
+		case 1:
+			m.SetContext(GenerateContainerSessionContext(false))
+		}
 	}
 
 	return m