Deep dive in Kotlin extensions 1

Extensions.kt

import org.junit.Assert.assertEquals
import org.junit.Test

fun String.removeWhitespaces() = replace(" ", "")

class StringKtTest {
    @Test fun removesWhitespacesFromString() {
        val tested = "Piotr Slesarew"

        val actual = tested.removeWhitespaces()

        val expected = "PiotrSlesarew"
        assertEquals(expected, actual)
    }
}