Resolve "Implement integration tests for applications"

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Related to #347

integration-tests/application_tests/appUtility_test.go

@@ -6,6 +6,7 @@ import (
 	"os/signal"
 	"strings"
 	"syscall"
+	"time"
 
 	"code.fbi.h-da.de/danet/gosdn/application-framework/event"
 	"code.fbi.h-da.de/danet/gosdn/application-framework/registration"
@@ -47,7 +48,7 @@ func NewApplication(ctx context.Context, grpcClientConn *grpc.ClientConn, contro
 		eventService:   eventService,
 		stopChannel:    make(chan os.Signal, 1),
 		grpcClientConn: grpcClientConn,
-		eventChannel:   make(chan event.Event, 100),
+		eventChannel:   make(chan event.Event, 1),
 	}
 }
 
@@ -55,6 +56,7 @@ func NewApplication(ctx context.Context, grpcClientConn *grpc.ClientConn, contro
 func (a *Application) Run(eventTypeCallbackTuples []event.TypeToCallbackTuple) {
 	signal.Notify(a.stopChannel, os.Interrupt, syscall.SIGTERM)
 
+	time.Sleep(5 * time.Second)
 	a.eventService.SubscribeToEventType(eventTypeCallbackTuples)
 	a.eventService.SetupEventReciever(a.stopChannel)