Platform (all, jvm, js): all
Extension (none, kotlin 1.3): none

Code related feature

We want to move away from spek as it's future regarding maintenance and development is quite unsure.
As I don't want to loose hierarchical test setup I decided that we go with kotest

Following the things you need to do:

• add dependency to kotest to the common platform in misc/atrium-specs/build.gradle.kts (if not already there)
• figure out if kotest has an include mechanism as well
• copy SubjectLessSpec, rename to SubjectLessKotestBasedSpec and migrate to kotest
• rewrite atrium-core/src/commonTest/kotlin/ch/tutteli/atrium/assertions/builders/DescriptiveWithBasedOnSubjectSpec.kt to kotest extending a FunSpec

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