really strange issue with datatest and the intellij plugin. If I use `Int` as the type here, the tes...

# kotest

[snowe]

really strange issue with datatest and the intellij plugin. If I use Int as the type here, the tests render in the run panel correctly. But if I switch to Number, the tests render indexed, without parameters displayed, also it shows the FQDN rather than just the Adder name.

[snowe]

oh, and it also throws warnings due to the same test name

WARN: Duplicated test name com.sunrun.pricing.flex.BaseAdder. To disable this message, set DuplicateTestNameMode to None.

[Emil Kantis]

Seems to be due to Number not being considered a primitive when checking if it’s stable to use for generating names. Maybe it should be - any implementation of Number must be a platform primitive, right? 🤔 nvm, anything can implement it so I suppose it makes sense

https://github.com/kotest/kotest/blob/master/kotest-framework/kotest-framework-api/src/commonMain/kotlin/io/kotest/core/test/Identifiers.kt

https://github.com/kotest/kotest/blob/master/kotest-common/src/commonMain/kotlin/io/kotest/mpp/stable.kt

[Emil Kantis]

You could perhaps provide the nameFn explicitly, like

withData {
  nameFn = BaseAdder::toString,
  BaseAdder(..),
  ..

[snowe]

@Emil Kantis that worked! interesting. not sure I understand why that worked though.

[Emil Kantis]

I think this page explains it better than I could 🙂

[Emil Kantis]

https://kotest.io/docs/framework/datatesting/custom-test-names.html

[snowe]

Kotest will only use the toString() of the input class if it thinks the input class has a stable toString() value otherwise it will use the class name.

ah. that does explain it.