client: Add tests for contextCall.err in session creation

Signed-off-by: Evgenii Baidakov <evgenii@nspcc.io>

client/session_test.go

@@ -0,0 +1,74 @@
+package client
+
+import (
+	"context"
+	"testing"
+
+	v2netmap "github.com/nspcc-dev/neofs-api-go/v2/netmap"
+	"github.com/nspcc-dev/neofs-api-go/v2/rpc/client"
+	"github.com/nspcc-dev/neofs-api-go/v2/session"
+	neofscrypto "github.com/nspcc-dev/neofs-sdk-go/crypto"
+	"github.com/nspcc-dev/neofs-sdk-go/crypto/test"
+	"github.com/stretchr/testify/require"
+)
+
+type sessionAPIServer struct {
+	signer  neofscrypto.Signer
+	setBody func(body *session.CreateResponseBody)
+}
+
+func (m sessionAPIServer) netMapSnapshot(context.Context, v2netmap.SnapshotRequest) (*v2netmap.SnapshotResponse, error) {
+	return nil, nil
+}
+
+func (m sessionAPIServer) createSession(*client.Client, *session.CreateRequest, ...client.CallOption) (*session.CreateResponse, error) {
+	var body session.CreateResponseBody
+	m.setBody(&body)
+
+	var resp session.CreateResponse
+	resp.SetBody(&body)
+
+	if err := signServiceMessage(m.signer, &resp); err != nil {
+		return nil, err
+	}
+
+	return &resp, nil
+}
+
+func TestClient_SessionCreate(t *testing.T) {
+	ctx := context.Background()
+	signer := test.RandomSignerRFC6979(t)
+
+	var prmInit PrmInit
+	prmInit.SetDefaultSigner(signer)
+	prmInit.ResolveNeoFSFailures()
+
+	var c Client
+	c.Init(prmInit)
+
+	var prmSessionCreate PrmSessionCreate
+	prmSessionCreate.UseSigner(signer)
+	prmSessionCreate.SetExp(1)
+
+	t.Run("missing session id", func(t *testing.T) {
+		c.setNeoFSAPIServer(&sessionAPIServer{signer: signer, setBody: func(body *session.CreateResponseBody) {
+			body.SetSessionKey([]byte{1})
+		}})
+
+		result, err := c.SessionCreate(ctx, prmSessionCreate)
+		require.Nil(t, result)
+		require.ErrorIs(t, err, errMissingResponseField)
+		require.Equal(t, "missing session id field in the response", err.Error())
+	})
+
+	t.Run("missing session key", func(t *testing.T) {
+		c.setNeoFSAPIServer(&sessionAPIServer{signer: signer, setBody: func(body *session.CreateResponseBody) {
+			body.SetID([]byte{1})
+		}})
+
+		result, err := c.SessionCreate(ctx, prmSessionCreate)
+		require.Nil(t, result)
+		require.ErrorIs(t, err, errMissingResponseField)
+		require.Equal(t, "missing session key field in the response", err.Error())
+	})
+}