'Kotlin JUnit Rules
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.
Solution 1:[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.
Solution 2:[2]
If anyone stumble's on this. I believe the approach with JJunit5 would be using @TempDir. https://junit.org/junit5/docs/5.4.2/api/org/junit/jupiter/api/io/TempDir.html
If you would need share the TempDir with tests, it must be a static property of the class. Static for java or within a companion Object for Kotlin
Sources
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Source: Stack Overflow
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