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JUnit

Basic Setup​

Solution​

fun add(a: Int, b: Int) = a + b
fun add(a: Int, b: Int) = a + b

Tests (JUnit 5)​

import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.DisplayName
import org.junit.jupiter.api.Nested
import org.junit.jupiter.api.Test

@DisplayName("Testing Adder")
class AdderTests {
    @Test
    @DisplayName("add(1, 1) returns 2")
    fun addTwo() {
        assertEquals(2, add(1, 1), "1 + 1 should equal 2")
    }

    @Nested
    @DisplayName("Negative Integers")
    class Negatives {
        @Test
        @DisplayName("add(-1, -1) returns -2")
        fun addTwoNegative() {
            assertEquals(-2, add(-1, -1), "-1 + -1 should equal -2")
        }
    }
}
import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.DisplayName
import org.junit.jupiter.api.Nested
import org.junit.jupiter.api.Test

@DisplayName("Testing Adder")
class AdderTests {
    @Test
    @DisplayName("add(1, 1) returns 2")
    fun addTwo() {
        assertEquals(2, add(1, 1), "1 + 1 should equal 2")
    }

    @Nested
    @DisplayName("Negative Integers")
    class Negatives {
        @Test
        @DisplayName("add(-1, -1) returns -2")
        fun addTwoNegative() {
            assertEquals(-2, add(-1, -1), "-1 + -1 should equal -2")
        }
    }
}

Tests (JUnit 4)​

import kotlin.test.assertEquals
import org.junit.Test

class TestAdd {
    @Test
    fun addTest() {
        assertEquals(2, add(1, 1))
    }
}
import kotlin.test.assertEquals
import org.junit.Test

class TestAdd {
    @Test
    fun addTest() {
        assertEquals(2, add(1, 1))
    }
}