[KTLN-628] Add samples (Baeldung#575)

kotest/src/test/kotlin/com/baeldung/kotest/junitvskotest/JUnit5SampleTest.kt

@@ -0,0 +1,48 @@
+package com.baeldung.kotest.junitvskotest
+
+import org.junit.jupiter.api.AfterAll
+import org.junit.jupiter.api.AfterEach
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import org.junit.jupiter.api.TestInstance.Lifecycle
+
+@TestInstance(Lifecycle.PER_CLASS)
+class JUnit5SampleTest {
+    @BeforeAll
+    fun setUpClass() {
+        println("Setting up test class")
+    }
+
+    @BeforeEach
+    fun setUp() {
+        println("Setting up test")
+    }
+
+    @AfterEach
+    fun tearDown() {
+        println("Tearing down test")
+    }
+
+    @AfterAll
+    fun tearDownClass() {
+        println("Tearing down test class")
+    }
+
+    @Test
+    fun testExample() {
+        val result = 2 + 2
+
+        assertEquals (4, result, "2 + 2 should be equal to 4")
+        assertTrue(result > 0, "Result should be positive")
+        assertFalse(result < 0, "Result should not be negative")
+        assertNotNull(result, "Result should not be null")
+
+        println("Executing testExample()")
+    }
+}

kotest/src/test/kotlin/com/baeldung/kotest/junitvskotest/KotestSampleTest.kt

@@ -0,0 +1,37 @@
+package com.baeldung.kotest.junitvskotest
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.ints.shouldBeGreaterThan
+import io.kotest.matchers.ints.shouldNotBeLessThan
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
+
+class KotestSampleTest : FunSpec({
+    beforeSpec {
+        println("Setting up test class")
+    }
+
+    afterSpec {
+        println("Tearing down test class")
+    }
+
+    beforeEach {
+        println("Setting up test")
+    }
+
+    afterEach {
+        println("Tearing down test")
+    }
+
+    // This is a test
+    test("Test Example") {
+        val result = 2 + 2
+
+        result shouldBe 4
+        result shouldBeGreaterThan 0
+        result shouldNotBeLessThan 0
+        result shouldNotBe null
+
+        println("Executing Test Example")
+    }
+})