The art of Azure Functions (unit) testing and monitoring
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The document discusses testing and monitoring Azure Functions. It explains that Azure Functions should be written to allow dependencies to be mocked or stubbed for testing. The document demonstrates how to make Azure Functions testable using constructor injection to substitute mock services. It also discusses using logging and custom metrics to monitor Azure Functions performance and errors when deployed, including built-in integration with Application Insights. Code samples and a live demo are provided.
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The art of Azure Functions (unit) testing and monitoring
- 1. The art of Azure Functions (unit) testing and monitoring Massimo Bonanni Paranormal Trainer, with the head in the Cloud and all the REST in microservices! [email protected] @massimobonanni
- 2. The issue…. If you want to use Azure Functions as a components of your Enterprise solutions, you must to test and monitor them!!!
- 3. What are Azure Functions Author functions in C#, F#, Node.JS, Java, Powershell, and more CodeEvents React to timers, HTTP, or events from your favorite Azure services, with more on the way Outputs Send results to an ever-growing collection of services
- 4. What is a Unit Test In a unit test you invoke a piece of your code with a set of parameters and you checks the correctness its behavior. In a unit test you must substitute all your external reference with a mock or stub. Mock is for the software what a dummy is for a car crash test (you don’t test a car with a human being inside…I Hope!!)
- 5. Azure Functions Dependencies You should implement your Azure Functions to allow you to use mock/stub for all external reference! Your Function Trigger Binding Binding Binding Binding Logger (infrastructure) Your Service Your Service Your Service Your Service
- 6. Azure Function … untestable!!
- 7. Azure Function … trigger!! Trigger You can mock it because the trigger payload is a POCO class
- 8. Azure Function … bindings!! Binding You can mock it because the binding payload is an interface
- 9. Azure Function … logger!! Logger (infrastructural stuffs) You can mock it because the logger is an interface
- 10. Azure Function … your service!! External service You cannot substitute it with your mock because it is created inside the Azure Function and you haven’t a way to substitute it
- 11. Make your Azure Function testable!!!
- 12. Azure Function … testable!! Constructor Injection You can choose what kind of actual service you want to use when you instantiate the function. In a test you can substitute it with a mock!!
- 13. Azure Function … how to use mock!! Mock Create a mock to use in the test!!
- 15. Monitoring Azure Functions Once you deploy your Azure Functions on Azure, you need to monitor them to check when something goes wrong. The signature of an Azure Function method provides the instance of ILogger that you can use to log information about your code. Using ILogger, you can collect information from your code execution to monitor and triage errors and exceptions.
- 16. Azure Functions Monitor Azure Functions provide out-of-the-box monitor feature. For each Function, you have info about every function execution.
- 17. Azure Functions and Application Insight The Azure Functions platform offers built-in integration with Azure Application Insights. Put the Application Insights instrumentation key in the function app settings.
- 18. Custom Metric Azure Function SDK provides you extension methods to log custom metrics.
- 20. Take away Writing an Azure Functions is simple! Testing Azure Functions is simple! Monitoring Azure Functions is simple! …. then ….
- 22. Q&A Thanks for your attention!!!!! Massimo Bonanni Azure Technical Trainer @ Microsoft [email protected] @massimobonanni Connect with me on LinkedIn linkedin.com/in/massimobonanni/ http://bit.ly/MasteringServerless Q&A
- 23. References Azure Functions Documentation https://docs.microsoft.com/en-US/azure/azure-functions/ Azure Functions Code Samples https://azure.microsoft.com/en-us/resources/samples/?service=functions&sort=0 Azure Updates https://azure.microsoft.com/en-us/roadmap/?category=compute Demo MortgageCalculator – GitHub http://bit.ly/TestAZFunc Demo Monitor Azure Functions – GitHub http://bit.ly/MonitorAZFunc