For most web applications, you can test locally, as you normally would before you deploy. I generally tend to use Docker containers to run things locally, like testing or add a .NET Core App to Docker. There are also some emulators to help with local development. Let's start by installing Docker locally; I would make sure you are running Hyper-V locally or Docker will install VirtualBox as the management resource. Before you install, review the documentation at https://docs.docker.com/docker-for-windows/install/. I use Docker to install things like MongoDB, CosmosDB, and so on.

The other things I install (optional) are as follows:

1. CosmosDB: https://docs.microsoft.com/en-us/azure/cosmos-db/local-emulator
2. Azure Functions Run-time: https://docs.microsoft.com/en-us/azure/azure-functions/functions-runtime-overview
3. Azure Logic Apps: https://marketplace.visualstudio.com/items?itemName=VinaySinghMSFT.AzureLogicAppsToolsforVisualStudio-18551

This is my short list of extras, and as we begin to go through development, I will point out other things that I like to use to make things easier.