For unit tests in Kotlin, what would be the best way to specify my properties file I want to use with the test. Say if I am running my tests against a different environment?

/**
 * API tests for User service
 */
class UserApiTests : RestAssuredSupport {


    val config = systemProperties() overriding
            EnvironmentVariables() overriding
            ConfigurationProperties.fromResource("office.properties")

Can I just have a command line argument for the properties file, or is there a smarter way?

From Java To Kotlin - Your Cheat Sheet For Java To Kotlin https://github.com/MindorksOpenSource/from-java-to-kotlin

What would be a work around to initialize an

object

, something like this:

object RemoteService (val context: Context) {

    init {
         // use the `context` here
    }
}

a setter method?

You should not store context in static filed because object stores it properties in static fields. I had the same question the other day https://stackoverflow.com/q/44134811/7314061

Can anyone suggest stdlib function that allows to iterate over list and terminate after certain criteria? I know it has to be smt but I can't find it(

@arnis71

list.takeWhile { it > 3 }

and then a for loop or forEach

Yeah that should do. Thanks!

Wait, but what if I need only one value to be emitted? E.g. it == 3 ?

are you looking for

list.find { it == 3 }

?

find

and

firstOrNull

are identical.

first

is also similar but will throw if nothing is found matching the lambda

@kevinmost exactly what I was looking for. Thanks!

Can somebody suggest what is the best way to convert following class to Kotlin. It is currently using from different .java classes across the app (which will not become kotlin any time soon). Should I just convert it to

object Geometry

, to

internal object

, or define as companion class? So many ways to choose from 🙂

public class Geometry {
    private Geometry() {}

    public static boolean segmentsIntersect(long start1, long end1, long start2, long end2) {
        return end1 > start2 && end2 > start1;
    }

    public static boolean pointWithinSegment(long point, long boundStart, long boundEnd) {
        return boundStart <= point && point < boundEnd;
    }
}

As a general rule of thumb, if you don't want something to be instantiable (Is that even a word, if you don't want to be able to instantiate it at all), object is what you're looking for

If you want a few "static" things, but you still want to be able to instantiate it, a class with a companion object is what you want

I see. That's what Kotlin converted it into - an object. So from java code I call it like

boolean result =  Geometry.INSTANCE.segmentsIntersect(....)

I believe so

(Also if you want anything to happen when the object is first instantiated into that INSTANCE variable, you can still run code in

init { }

blocks)

Cool, thank you!

You could annotate the methods with

@JvmStatic

to have

Geometry.segmentsIntersect(...)

Hi all, I've written several test classes in kotlin, whats the best way to run these from command line or maven?

@cuttiesark https://kotlinlang.org/docs/tutorials/command-line.html

Hey let’s say I have a data class

data class Foo(val id: Long)

and I want to have an annotation of

id

it seems that if I do

data class Foo(@Bar val id: Long)

the annotation goes on the constructor parameter, but not the field

what’s the way to do that?

@bod Check out annotation use-site targets: https://kotlinlang.org/docs/reference/annotations.html#annotation-use-site-targets

thanks a lot @diesieben07 🙂 that worked

@diesieben07 would that allow me to give custom annotation to file ? Like for example FB’s Litho’s LayoutSpec annotation ?

@lupajz Yes, you can apply annotations to a "file-class" (the class generated for a file with top-level functions)