Hello folks! I have a question with regards to clues - certain other frameworks, most notably Spock...

# kotest

[Ioannis Mavroukakis]

Hello folks! I have a question with regards to clues - certain other frameworks, most notably Spock and Hamcrest, when an assertion fails they show the data under test that failed, by default. Is there any way to do this in Kotest without having to wrap everything in clues?

[CLOVIS]

Isn't this already the case by default? Do you have an example of a test that doesn't behave like this?

[Ioannis Mavroukakis]

test("test list contains all elements"){
            val strings = listOf("One", "two", "three")
            strings.shouldContainAll("One", "two", "three","four")
        }

gives me

Collection should contain all of ["One", "two", "three", "four"] but was missing ["four"]

[Ioannis Mavroukakis]

to make it into a better example,

test("test list contains all elements"){
            val strings = listOf("One", "two", "three","five")
            strings.shouldContainAll("One", "two", "three","four")
        }

kotest tells me that four is missing, but I have no clue that a five has snuck in

[Ioannis Mavroukakis]

on the other hand `

shouldContainExactly

behaves in the expected way

[Ioannis Mavroukakis]

am I the fool here?

[CLOVIS]

Well, you're asking Kotest to check that these elements are in the list, you did not say you don't want any other elements

[CLOVIS]

In this case I think what you want to test is shouldContainExactly , or even just shouldBe

[Ioannis Mavroukakis]

that's not quite what I want though 🙂 I want feedback on what is there, irrespective of the matcher.

[Ioannis Mavroukakis]

(without having to write clues boilerplate)

[CLOVIS]

If you use assertSoftly it creates the clue automatically IIRC

[Ioannis Mavroukakis]

you mean like so?

assertSoftly(strings){
                shouldContainAll("One", "two", "three","four")
            }

[CLOVIS]

Yes, I think this prints the entire list? I'm not 100% sure

[Ioannis Mavroukakis]

trying it out..

[Ioannis Mavroukakis]

no 😞

[CLOVIS]

Ah, it could probably be a feature request to have assertSoftly imply withClue

[Ioannis Mavroukakis]

yeah probably.even with asClue the output is nowhere near as nice by default as with the shouldContainExactly

[One, two, three, five]
java.lang.AssertionError: [One, two, three, five]

[Ioannis Mavroukakis]

just trying to save keystrokes and frustration 😆

[Ioannis Mavroukakis]

thanks Ivan, appreciate the insight

[CLOVIS]

I created an issue for it, please upvote 🙂 https://github.com/kotest/kotest/issues/3418