diff --git a/tests/check/check_test.go b/tests/check/check_test.go
index 743e8cd..8e5502e 100644
--- a/tests/check/check_test.go
+++ b/tests/check/check_test.go
@@ -15,3 +15,5 @@ func TestNonInterfaceNotAllowed(t *testing.T) {
 	_ = Mock[St]()
 	r.AssertError()
 }
+
+
diff --git a/tests/handler/handler_test.go b/tests/handler/handler_test.go
new file mode 100644
index 0000000..821e7de
--- /dev/null
+++ b/tests/handler/handler_test.go
@@ -0,0 +1,60 @@
+package handler
+
+import (
+	. "github.com/ovechkin-dm/mockio/mock"
+	"github.com/ovechkin-dm/mockio/tests/common"
+	"testing"
+)
+
+type APIServiceA interface {
+	GetAll() ([]string, error)
+	Delete(ID string) error
+	Add(ID string) error
+}
+
+type APIServiceX interface {
+	SendMessage(message string) error
+	IncrementCounterBy(incr int) error
+}
+
+type OtherService struct {
+	serviceA APIServiceA
+	serviceX APIServiceX
+}
+
+func (s OtherService) AddAllFromServiceA(strings []string) error {
+	for _, str := range strings {
+		err := s.serviceA.Add(str)
+		if err != nil {
+			return err
+		}
+	}
+	s.serviceX.IncrementCounterBy(1)
+	return nil
+}
+
+func TestGetAllFromServiceAUsingMockio(t *testing.T) {
+	r := common.NewMockReporter(t)
+	SetUp(r)
+	mockServiceA := Mock[APIServiceA]()
+
+	When(mockServiceA.Add(AnyString()))
+
+	mockServiceX := Mock[APIServiceX]()
+	mockServiceX.SendMessage("TEST2")
+
+	s := OtherService{
+		serviceA: mockServiceA,
+		serviceX: mockServiceX,
+	}
+
+	_ = s.AddAllFromServiceA([]string{"TEST", "OTHER"})
+
+	_ = Verify(mockServiceA, Once()).Add("TEST")
+	_ = Verify(mockServiceA, Once()).Add("OTHER")
+	_ = Verify(mockServiceX, Once()).SendMessage("TEST2")
+	Verify(mockServiceX, Once()).IncrementCounterBy(1)
+	VerifyNoMoreInteractions(mockServiceA)
+	VerifyNoMoreInteractions(mockServiceX)
+	r.AssertNoError()
+}