Kotlin JUnit Rules

Question

In Kotlin M13, this was an acceptable way to create a JUnit rule:

@Rule @publicField val temp = TemporaryFolder()

Now that @publicField has been deprecated, how else can this be achieved? The IDE hint suggests replacing @publicField with lateinit, but lateinit val's are no longer allowed, and I'm not sure this would help even if they were.

Answer 1

The answer as of Kotlin 1.0 is as follows:

@Rule @JvmField val temp = TemporaryFolder()

@JvmField exposes the backing field with the same visibility as the property, ergo a public field for the JUnit rule to use.