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/application_test.go

@@ -47,7 +47,7 @@ func TestMain(m *testing.M) {
 	integration_test_utils.ApplySDNConfig(conn, ctx, defaultSDNConfig)
 
 	topics := []event.Topic{event.ManagedNetworkElement, event.User}
-	application = NewApplication(ctx, localConn, ":55055", topics)
+	application = NewApplication(ctx, conn, ":55055", topics)
 
 	eventTypeCallbackTuples := []event.TypeToCallbackTuple{
 		{