BAEL-382 null-safety example

kotlin/pom.xml

@@ -14,6 +14,18 @@
             <artifactId>kotlin-stdlib</artifactId>
             <version>1.0.4</version>
         </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test-junit</artifactId>
+            <version>1.0.4</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -24,7 +36,6 @@
                 <artifactId>kotlin-maven-plugin</artifactId>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <version>1.0.4</version>
-
                 <executions>
                     <execution>
                         <id>compile</id>

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)
+    }
+}