07 Test Deployed Azure Function.md

Testing the Deployed Function

Again, testing the deployed function by copying URLs from the command prompt and pasting into a web client is a bit too manual. It's time-consuming and easy to forget to do. So it's time to automate again.

Pulumi.Automation

The Pulumi Automation sdk allows us to grab values from the stack output instead of having to copy-paste, and feed them into automated test.

mkdir Deployment.Tests
cd Deployment.Tests
dotnet new library --language F#

Add a paket.references file for the same test assemblies used in the other test project (so they're all already in the paket.dependencies)

Microsoft.NET.Test.Sdk
SchlenkR.FsHttp
xunit
xunit.runner.visualstudio
coverlet.collector
FSharp.Core

And then add the Pulumi Automation Api to interact with our Pulumi stack

dotnet paket add Pulumi.Automation --project Deployment.Tests
dotnet restore

Again using xUnit's class fixtures we can get the outputs from the Pulumi stack

type PulumiStack (stackName, folder, envVars) =
    let outputs =
        task {
            let  args    = LocalProgramArgs(stackName, folder, EnvironmentVariables = envVars)
            let! stack   = LocalWorkspace.SelectStackAsync(args)
            let! outputs = stack.GetOutputsAsync()
            return outputs
        }

    member _.GetOutputs() =
        outputs.Result

Then in the test, we can grab the "endpoint" output from the stack fixture

        let outputs = stack.GetOutputs()
        let testUri = Uri(outputs.["endpoint"].Value :?> string, UriKind.Absolute)

And use FsHttp to test the deployed function.