unit tests added

Author: nappy29

core-kotlin-modules/core-kotlin-advanced-3/src/test/kotlin/com/baeldung/guideToAnyUnitAndNothing/GuideToAnyUnitAndNothingUnitTest.kt

@@ -0,0 +1,41 @@
+package com.baeldung.guideToAnyUnitAndNothing
+
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFailsWith
+
+class GuideToAnyUnitAndNothingUnitTest {
+
+    @Test
+    fun `prints value for any type`() {
+        val intValue = 14
+        val stringValue = "Hello Kotlin"
+
+       assertEquals("Hello Kotlin", printAnyType(stringValue))
+       assertEquals(14, printAnyType(intValue))
+    }
+
+    @Test
+    fun `shows how to use unit type`() {
+        val result = performTask()
+        assertNotNull(result)
+    }
+
+    @Test
+    fun `shows how to use nothing type`() {
+        assertFailsWith<IllegalArgumentException> {
+            throwError("Invalid argument")
+        }
+    }
+}
+fun printAnyType(value: Any): Any {
+    return value
+}
+fun performTask(): Unit {
+    println()
+}
+fun throwError(message: String): Nothing {
+    throw IllegalArgumentException(message)
+}