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I’m working on examples and docs for this, would love to know more about your experience/examples!

My experience is very good so far. I think the two things that I wish they were already part of the default experience is

Deployment.TestAsync

to return all the resources without a need from me to do mocking so I ended up with having this little helper to return resources:

public static async Task<ImmutableArray<Resource>> TestAsync<TStack>(
            TestOptions options = null)
            where TStack : Stack, new()
        {
            var mock = new Mock<IMocks>();

            mock.Setup(m => m.NewResourceAsync(It.IsAny<string>(), It.IsAny<string>(),
                    It.IsAny<ImmutableDictionary<string, object>>(), It.IsAny<string>(), It.IsAny<string>()))
                .ReturnsAsync((string resource, string name, ImmutableDictionary<string, object> inputs, string provider,
                    string id) => (name + "-test", inputs));
            var resources = await Deployment.TestAsync<MyStack>(mock.Object);
            return resources;
        }

The other one is to extract the value of

Output

variables:

public static class OutputExtensions
    {
        public static T GetValue<T>(this Output<T> output)
        {
            T result=default;
            output.Apply(x => result = x);
            return result;
        }
    }

so to validate that a resource group has tags of product on it, my test looks like this

[Fact]
public async Task AllResourceGroups_Should_Have_ProductName_Tag()
{
    var resources = await TestAsync<MyStack>();
    var resourceGroups = resources.OfType<Pulumi.Azure.Core.ResourceGroup>();
    resourceGroups.ShouldAllBe(rg =>rg.Tags.GetValue().ContainsKey("productname"));
}

Right, I have two helper methods very similar to yours 🙂

My

TestStack

is inspired from the your

TestProperty

that was part of the unit tests pull request so credit to you 😉