Is there a "Without" pendant to Kotlin.Tests AssertFailsWith?-CodePudding

Using Kotlin.Test to check that a function fails and throws an exception of type IOException is easy:

assertFailsWith<IOException> { myFun() }

However, i want to also check this call does NOT throw an exception of type E : IOException, where E is a subtype of IOException. Something like

assertFailsButWithout<E> { myFun() }

How do i do this? Searching for assertFailsWith here on SO only yields 5 unrelated results.

But why? I'm testing my network stack implemented in retrofit okhttp. The stack throws custom errors of type E - which have to subtype IOException, due to some weird restriction of retrofit. I now want to test a case like "A disconnect should fail with an IOException, NOT with one of my custom exceptions (e.g. a "MyEmptyResponseError")

CodePudding user response：

Test that it fails with IOException, and then assert that the exception is not your custom exception:

val thrown = assertFailsWith<IOException> { myFun() }
assertIsNot<MyEmptyResponseError>(thrown)

CodePudding user response：

Something like this :

assertFailsButWithout<E> { 
    try{
        myFun()
        assertTrue(true)
    }
    catch(ex :E){
        assertTrue(false)
    }
    catch(ex :Exception){
        assertTrue(true)
    }
}