Hi everyone, does anyone have an example of writing tests for stacks that include calls to a Pulumi Function? Concrete example: I need to write a test for a method that creates an Azure Event Hub connection string by calling the

ListNamespaceKeys

Function, like so:

public Output<string> CreateConnectionString(string applicationName, params Union<string, AccessRights>[] accessRights)
{
    var authorisationRule = new NamespaceAuthorizationRule(applicationName, new NamespaceAuthorizationRuleArgs
    {
        AuthorizationRuleName = applicationName,
        Rights = accessRights,
        NamespaceName = _eventHubNamespace.Name,
        ResourceGroupName = ResourceGroupName
    }, CustomResourceOptions);

    return ListNamespaceKeys.Invoke(new ListNamespaceKeysInvokeArgs
    {
        AuthorizationRuleName = authorisationRule.Name,
        NamespaceName = _eventHubNamespace.Name,
        ResourceGroupName = ResourceGroupName
    }, _invokeOptions).Apply(o => Output.CreateSecret(o.PrimaryConnectionString));
}

The Functions pass through

IMocks.CallAsync()

, but the

ListNamespaceKeysResult

type is sealed and the constructor private, and neither anonymous types nor a copy of the

Result

type can be serialised by Pulumi. I feel like I'm missing something here, and the documentation isn't filling in the gap 😕 (For the purposes of the tests, I don't much care about the precise value of the

PrimaryConnectionString

property--i.e., whether or not it's a valid connection string--and certainly don't care about the values of any of the other properties.)