How to enable assertions in Kotlin?

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Learn more about Teams All of the answers on this topic are uniform in the sentence like "run the JVM with the

-ea

option", however I cannot find how to actually do that in Android Studio. Googling "kotlin android studio set jvm option" or similar yields no solution. EDIT: After a while of question rephrasing I found the solution, if anyone will be wondering the same Where to add compiler options like -ea in IntelliJ IDEA? – Bojan P. Jun 21, 2019 at 9:30

In Kotlin , unlike Java , assertions can be enabled/disabled only on top-level, i.e. by specifying -ea option to JVM.

Behind the scenes, assert() in Kotlin is a function, defined in AssertionsJVM.kt file. ENABLED variable in the _Assertions object is used to determine if assertions are enabled.

@PublishedApi
internal object _Assertions {
    @JvmField @PublishedApi
    internal val ENABLED: Boolean = javaClass.desiredAssertionStatus()
The ENABLED variable is assign to true if assertions enabled for the _Assertions class.
As a consequence, to turn on asserts in Kotlin they have to be enabled in JVM for
all classes -ea
or one particular class -ea:kotlin._Assertions
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