diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d73e36..723ce9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ REFACTOR:
 * resolve issue #38: simplify DiscoveryAllBuckets and remove suspicious if
 * resolve issue #46: drastically simplify RouterMapCallRWImpl and added tests with real tnt
 * Use typed nil pointers instead of memory allocation for EmptyMetrics and emptyLogger structs
+* New test for RouterCallImpl (and fix the old one)
 
 EXAMPLES:
 * customer go mod fixed 
diff --git a/tests/tnt/Makefile b/tests/tnt/Makefile
index 8e82e1b..b6b32d1 100644
--- a/tests/tnt/Makefile
+++ b/tests/tnt/Makefile
@@ -1,5 +1,6 @@
-NREPLICASETS?=5
-START_PORT?=33000
+export NREPLICASETS:=5
+export START_PORT:=33000
+export OBJC_DISABLE_INITIALIZE_FORK_SAFETY:=YES # See review comments for PR #56 why
 
 RED=\033[0;31m
 GREEN=\033[0;32m
@@ -19,7 +20,7 @@ clean:
 
 # prepare vshard-storages, that contains ${NREPLICASETS} replicasets.
 # every replicaset has one master and one follower instance.
-# every replicaset runs in background mode, no logs are stored (/dev/null)
+# every replicaset runs in background mode
 cluster-up:
 	@echo "${GREEN}STAGE: CLUSTER UP${NC}"
 	mkdir -p tmp
@@ -30,16 +31,16 @@ cluster-up:
 		ln -sf `(pwd)`/cfgmaker.lua tmp/$${rsid}/master/cfgmaker.lua;					\
 		ln -sf `(pwd)`/storage.lua tmp/$${rsid}/follower/storage_$${rsid}_follower.lua;	\
 		ln -sf `(pwd)`/cfgmaker.lua tmp/$${rsid}/follower/cfgmaker.lua;					\
-		TT_WORK_DIR=tmp/$${rsid}/master/ TT_PID_FILE="tarantool.pid" TT_BACKGROUND=true START_PORT=${START_PORT} TT_LOG=/dev/null NREPLICASETS=${NREPLICASETS} tarantool tmp/$${rsid}/master/storage_$${rsid}_master.lua;		\
-		TT_WORK_DIR=tmp/$${rsid}/follower/ TT_PID_FILE="tarantool.pid" TT_BACKGROUND=true START_PORT=${START_PORT} TT_LOG=/dev/null NREPLICASETS=${NREPLICASETS} tarantool tmp/$${rsid}/follower/storage_$${rsid}_follower.lua;	\
+		TT_WORK_DIR=tmp/$${rsid}/master/ TT_PID_FILE=tarantool.pid TT_BACKGROUND=true TT_LOG=tarantool.log tarantool tmp/$${rsid}/master/storage_$${rsid}_master.lua;		\
+		TT_WORK_DIR=tmp/$${rsid}/follower/ TT_PID_FILE=tarantool.pid TT_BACKGROUND=true TT_LOG=tarantool.log tarantool tmp/$${rsid}/follower/storage_$${rsid}_follower.lua; \
 		((rsid = rsid + 1)) ; \
-    done
+	done
 
 # bootstrap vshard cluster using lua vshard.router
 bootstrap:
 	@echo "${GREEN}STAGE: BOOTSTRAP CLUSTER${NC}"
 	mkdir -p tmp/router_work_dir
-	TT_WORK_DIR=tmp/router_work_dir/ NREPLICASETS=${NREPLICASETS} START_PORT=${START_PORT} tarantool router.lua
+	TT_WORK_DIR=tmp/router_work_dir/ tarantool router.lua
 
 # stop vshard storage tarantool
 cluster-down:
@@ -53,5 +54,5 @@ cluster-down:
 # run go tests, minus "-" signs before command allows failures, otherwise cluster-down stage won't run.
 gotest:
 	@echo "${GREEN}STAGE: RUN GOTESTS${NC}"
-	-NREPLICASETS=${NREPLICASETS} START_PORT=${START_PORT} go test -race -parallel=20 -coverpkg="../../" -coverprofile cover.out -timeout=90s
+	-go test -race -parallel=20 -coverpkg="../../" -coverprofile cover.out -timeout=90s
 #	go tool cover -html=cover.out
diff --git a/tests/tnt/cfgmaker.lua b/tests/tnt/cfgmaker.lua
index ec0f434..437bf27 100644
--- a/tests/tnt/cfgmaker.lua
+++ b/tests/tnt/cfgmaker.lua
@@ -89,7 +89,6 @@ end
 local function clustercfg(start_port, nreplicasets)
     local cfg = {
         sharding = {},
-        replication_connect_quorum = 0,
     }
 
     for rs_id = 1, nreplicasets do
diff --git a/tests/tnt/concurrent_topology_test.go b/tests/tnt/concurrent_topology_test.go
index 3811ea3..972f03f 100644
--- a/tests/tnt/concurrent_topology_test.go
+++ b/tests/tnt/concurrent_topology_test.go
@@ -10,6 +10,7 @@ import (
 	"time"
 
 	vshardrouter "github.com/KaymeKaydex/go-vshard-router"
+	"github.com/stretchr/testify/require"
 )
 
 type concurrentTopologyProvider struct {
@@ -115,7 +116,9 @@ func TestConncurrentTopologyChange(t *testing.T) {
 		return
 	}
 
-	t.Parallel()
+	// Don't run this parallel with other tests, because this test is heavy and used to detect data races.
+	// Therefore this test may impact other ones.
+	// t.Parallel()
 
 	tc := &concurrentTopologyProvider{}
 
@@ -127,9 +130,8 @@ func TestConncurrentTopologyChange(t *testing.T) {
 		User:             defaultTntUser,
 		Password:         defaultTntPassword,
 	})
-	if err != nil {
-		panic(err)
-	}
+
+	require.Nil(t, err, "NewRouter finished successfully")
 
 	wg := sync.WaitGroup{}
 
@@ -151,7 +153,11 @@ func TestConncurrentTopologyChange(t *testing.T) {
 			bucketID := uint64((rand.Int() % totalBucketCount) + 1)
 			args := []interface{}{"arg1"}
 
-			_, _, _ = router.RouterCallImpl(ctx, bucketID, vshardrouter.CallOpts{}, "echo", args)
+			callOpts := vshardrouter.CallOpts{
+				VshardMode: vshardrouter.ReadMode,
+			}
+
+			_, _, _ = router.RouterCallImpl(ctx, bucketID, callOpts, "echo", args)
 		}
 	}()
 
diff --git a/tests/tnt/router_call_test.go b/tests/tnt/router_call_test.go
new file mode 100644
index 0000000..5eccd2d
--- /dev/null
+++ b/tests/tnt/router_call_test.go
@@ -0,0 +1,50 @@
+package tnt_test
+
+import (
+	"context"
+	"log"
+	"math/rand"
+	"testing"
+	"time"
+
+	vshardrouter "github.com/KaymeKaydex/go-vshard-router"
+	"github.com/KaymeKaydex/go-vshard-router/providers/static"
+	"github.com/stretchr/testify/require"
+	"github.com/tarantool/go-tarantool/v2/pool"
+)
+
+func TestRouterCall(t *testing.T) {
+	if !isCorrectRun() {
+		log.Printf("Incorrect run of tnt-test framework")
+		return
+	}
+
+	t.Parallel()
+
+	ctx := context.Background()
+
+	cfg := getCfg()
+
+	router, err := vshardrouter.NewRouter(ctx, vshardrouter.Config{
+		TopologyProvider: static.NewProvider(cfg),
+		DiscoveryTimeout: 5 * time.Second,
+		DiscoveryMode:    vshardrouter.DiscoveryModeOn,
+		TotalBucketCount: totalBucketCount,
+		User:             defaultTntUser,
+		Password:         defaultTntPassword,
+	})
+
+	require.Nil(t, err, "NewRouter finished successfully")
+
+	//nolint:gosec
+	bucketID := uint64((rand.Int() % totalBucketCount) + 1)
+	args := []interface{}{"arg1"}
+
+	resp, _, err := router.RouterCallImpl(ctx, bucketID, vshardrouter.CallOpts{
+		VshardMode: vshardrouter.ReadMode,
+		PoolMode:   pool.PreferRO,
+	}, "echo", args)
+
+	require.Nil(t, err, "RouterCallImpl echo finished with no err")
+	require.EqualValues(t, args, resp, "RouterCallImpl echo resp correct")
+}
diff --git a/tests/tnt/routermap_call_test.go b/tests/tnt/routermap_call_test.go
index fb06d22..d0bdf3e 100644
--- a/tests/tnt/routermap_call_test.go
+++ b/tests/tnt/routermap_call_test.go
@@ -17,6 +17,8 @@ func TestRouterMapCall(t *testing.T) {
 		return
 	}
 
+	t.Parallel()
+
 	ctx := context.Background()
 
 	cfg := getCfg()
@@ -30,9 +32,7 @@ func TestRouterMapCall(t *testing.T) {
 		Password:         defaultTntPassword,
 	})
 
-	if err != nil {
-		panic(err)
-	}
+	require.Nil(t, err, "NewRouter finished successfully")
 
 	const arg = "arg1"
 
diff --git a/tests/tnt/storage.lua b/tests/tnt/storage.lua
index 930f735..3587123 100644
--- a/tests/tnt/storage.lua
+++ b/tests/tnt/storage.lua
@@ -85,6 +85,8 @@ box.once("testapp:schema:1", function()
     box.schema.role.grant('public', 'execute', 'function', 'raise_luajit_error')
     box.schema.func.create('raise_client_error')
     box.schema.role.grant('public', 'execute', 'function', 'raise_client_error')
+
+    box.schema.user.grant('guest', 'super')
 end)