BAEL-382 null-safety example

kotlin/src/main/kotlin/com/baeldung/Item.kt

@@ -0,0 +1,4 @@
+package com.baeldung
+
+
+data class Item(val id: String, val name: String)

kotlin/src/main/kotlin/com/baeldung/ItemService.kt

@@ -0,0 +1,10 @@
+package com.baeldung
+
+import java.util.*
+
+class ItemService {
+    fun findItemNameForId(id: String): Item? {
+        val itemId = UUID.randomUUID().toString()
+        return Item(itemId, "name-$itemId");
+    }
+}

kotlin/src/test/kotlin/com/baeldung/ItemServiceTest.kt

@@ -0,0 +1,20 @@
+package com.baeldung
+
+import org.junit.Test
+import kotlin.test.assertNotNull
+
+class ItemServiceTest {
+    @Test
+    fun givenItemId_whenGetForOptionalName_shouldMakeActionOnNonNullValue() {
+        //given
+        val id = "item_id"
+        val itemService = ItemService()
+
+        //when
+        val result = itemService.findItemNameForId(id)
+
+        //then
+        assertNotNull(result?.let { it -> it.id })
+        assertNotNull(result!!.id)
+    }
+}