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07 September, 2024

Kotlin spread operator for an array of functions does not satisfy Java Function... function argument definition

 Programing Coderfunda     September 07, 2024     No comments   

I need an overlay function around AssertJ extracting assertion.
Its current implementation:
import org.assertj.core.api.Assertions.assertThat
import org.assertj.core.groups.Tuple

fun checkObjectsHaveExactPropertyValue(
objectsList: List,
properties: Array,
expectedPropertyValue: R
) {
assertThat(objectsList)
.extracting(*properties)
.containsOnly(Tuple.tuple(expectedPropertyValue))
}



I want to be able to pass multiple property extractors as properties argument of my function. Then they are supplied to .extracting method.


And this is there code check and compilation error is:
Kotlin: None of the following functions can be called with the arguments supplied:
public open fun \ extracting(p0: Function\!): AbstractListAssert\! defined in org.assertj.core.api.ListAssert
public final fun extracting(vararg p0: Function\!): AbstractListAssert\! defined in org.assertj.core.api.ListAssert
public open fun extracting(vararg p0: String!): AbstractListAssert\! defined in org.assertj.core.api.ListAssert
public open fun extracting(p0: String!): AbstractListAssert\! defined in org.assertj.core.api.ListAssert
public open fun \ extracting(p0: ThrowingExtractor\!): AbstractListAssert\! defined in org.assertj.core.api.ListAssert



I don't see where I messed up.


I also tried following to debug typing:



* .extracting(properties[0], properties[1]) - compiles, function typing is correct, but not what I need

* different Iterable types (List, ArrayList, ...) - same error

* vararg properties: Function1 - same error

* properties: Array R> - same error






I expect there is correct typing for the argument of my function, so I can use overloaded method extracting(vararg Function!) defined in org.assertj.core.api.ListAssert.
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