Cannot instantiate a valid LocalPlayerSubsystem during an unit test

Development Programming & Scripting C++
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1

Hello guys, I tried a lot of different approaches, however I am unable to create a new LocalPlayer and, therefore, get a LocalPlayerSubsystem for unit testing.
Here’s a sample of code:

constexpr auto InventoryModifierTestFlags = EAutomationTestFlags::EngineFilter | EAutomationTestFlags::EditorContext |
	EAutomationTestFlags::HighPriority;


IMPLEMENT_SIMPLE_AUTOMATION_TEST(FPolkerCore_Inventory_CollectionsShouldBeLoaded,
                                 "PolkerCore.Inventory.CollectionsShouldBeLoaded",
                                 InventoryModifierTestFlags)

bool FPolkerCore_Inventory_CollectionsShouldBeLoaded::RunTest(const FString& Parameters)
{
	UWorld* MyWorld = FAutomationEditorCommonUtils::CreateNewMap();
	if (MyWorld)
	{
		UGameInstance* MyGameInstance = NewObject<UGameInstance>(MyWorld, UGameInstance::StaticClass());

		UEngine* MyEngine = GEngine;
		if (MyEngine)
		{
			MyWorld->SetGameInstance(MyGameInstance);
			MyGameInstance->InitializeStandalone();

			FString Error;
			ULocalPlayer* MyLocalPlayer = MyGameInstance->CreateLocalPlayer(0, Error, true);
			UPlayerInventorySubsystem* PlayerInventorySubsystem = ULocalPlayer::GetSubsystem<UPlayerInventorySubsystem>(MyLocalPlayer);
			TestNotNull(TEXT("PlayerInventorySubsystem is valid"), PlayerInventorySubsystem);
			TestTrue(TEXT("Dealer Collection count should be greater than 0"), PlayerInventorySubsystem->DealersCollection.Num() > 0);
			TestTrue(TEXT("Accessories Collection count should be greater than 0"), PlayerInventorySubsystem->AccessoriesCollection.Num() > 0);
		}
		else
		{
			TestFalse(TEXT("Engine is invalid"), true);
		}
	}
	else
	{
		TestFalse(TEXT("World is invalid"), true);
	}

	return true;
}

Debug mode stucks at the following point:

bool UGameInstance::IsDedicatedServerInstance() const
{
	if (IsRunningDedicatedServer())
	{
		return true;
	}
	else
	{
		return WorldContext ? WorldContext->RunAsDedicated : false;  //<--
	}
}

Not sure how to proceed after that, tried a lot of different approaches and none worked.
Thank you beforehand for help and hopefully the answer may help other users!

Rafael