Unit testing against properties in an Apply with C How do yo

Question

Unit testing against properties in an Apply with C How do you do that Assert s throw and exception which is how the frameworks pick it up but Exceptions in an Apply are swallowed How do you get access to the value outside of the apply or should I look at some kind of extension to extract the value outside the method and assert there

worried-knife-31967 · Answer

< bored oyster 3147> < tall librarian 49374> any thoughts on this As an example I want to assert that there are 2 backendpools in a frontdoor instance ``` var frontdoor = resources OfType lt Frontdoor gt FirstOrDefault var pools = frontdoor BackendPools ``` Therefore I m not sure how to access the ImmutableArray on that to check the size

worried-knife-31967 · Answer

Right now I m having to do ``` var frontdoor = resources OfType lt Frontdoor gt FirstOrDefault var backendPoolCount = 0 frontdoor BackendPools Apply bp = gt backendPoolCount = bp Count return false backendPoolCount ShouldBe 1 ``` which just feels dirty

tall-librarian-49374 · Answer

You can await outputs <https github com pulumi examples blob master testing unit cs WebserverStackTests cs L47>

worried-knife-31967 · Answer

glad you sent that that was what I was about to build would be better if it was supplied but I can see that it would be abused in a real scenario

little-cartoon-10569 · Answer

In NET does that code work < worried knife 31967> In TS it wouldn t the code in the `Apply ` would happen asynchronously and almost certainly after the `ShouldBe `

bored-oyster-3147 · Answer

Well it is a race condition but he is mocking all of the other resources so I don t think he actually had any asynchronous dependents so he might ve just got lucky that his code was executing synchronously causing that use of ` Apply` to work for him

little-cartoon-10569 · Answer

There are libraries for async testing in Node Hopefully there s similar support in NET The general pattern is to declare the test function async and await the async code Does that work in NET

bored-oyster-3147 · Answer

yea that is what Mikhail suggested

little-cartoon-10569 · Answer

Something like ``` TestMethod public async Task CorrectlyFailingTest var frontdoor = resources OfType lt Frontdoor gt FirstOrDefault await frontdoor BackendPools Apply bp = gt return bp Count GetValueAsync ShouldBe 1 ```

little-cartoon-10569 · Answer

Ah yes I see in that link `GetValueAsync ` Good stuff Updated previous comment

bored-oyster-3147 · Answer

actually you don t use apply anymore you just await the output directly so ```var backendPools = await frontdoor BackendPools GetValueAsync var backendPoolCount = backendPools Count ```

little-cartoon-10569 · Answer

Nice I want one of those for Node slightly smiling face

tall-librarian-49374 · Answer

Here you go ```const promise = lt T gt output pulumi Output lt T gt Promise lt T | undefined gt = gt output as any promise as Promise lt T gt it should have a tag key Name async = gt const tags = await promise vpc tags expect tags to include keys Name expect tags Name to equal my app ```

little-cartoon-10569 · Answer

I use Chai As Promised ```const promise = lt T gt output pulumi Output lt T gt Promise lt T | undefined gt = gt output as any promise as Promise lt T gt it should have a tag key Name async = gt expect vpc tags to eventually include keys Name expect vpc tags Name to eventually equal my app ```

little-cartoon-10569 · Answer

But it s not as nice as the NET version Something like ```const promise = lt T gt output pulumi Output lt T gt Promise lt T | undefined gt = gt it should have a tag key Name async = gt expect vpc tags getAsyncValue to include keys Name expect vpc tags Name getAsyncValue to equal my app ``` Or even `expectAsync vpc tags to include keys Name ` tidier still