Merge pull request eugenp#7926 from dcalap/master

BAEL-3323 Finding an element in a list using Kotlin - Initial commit

core-kotlin-2/src/test/kotlin/com/baeldung/lists/ListsUnitTest.kt

@@ -0,0 +1,34 @@
+package com.baeldung.lists
+
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class ListsUnitTest {
+
+    var batmans: List<String> = listOf("Christian Bale", "Michael Keaton", "Ben Affleck", "George Clooney")
+
+    @Test
+    fun whenFindASpecificItem_thenItemIsReturned() {
+        //Returns the first element matching the given predicate, or null if no such element was found.
+        val theFirstBatman = batmans.find { actor -> "Michael Keaton".equals(actor) }
+        assertEquals(theFirstBatman, "Michael Keaton")
+    }
+
+    @Test
+    fun whenFilterWithPredicate_thenMatchingItemsAreReturned() {
+        //Returns a list containing only elements matching the given predicate.
+        val theCoolestBatmans = batmans.filter { actor -> actor.contains("a") }
+        assertTrue(theCoolestBatmans.contains("Christian Bale") && theCoolestBatmans.contains("Michael Keaton"))
+    }
+
+    @Test
+    fun whenFilterNotWithPredicate_thenMatchingItemsAreReturned() {
+        //Returns a list containing only elements not matching the given predicate.
+        val theMehBatmans = batmans.filterNot { actor -> actor.contains("a") }
+        assertFalse(theMehBatmans.contains("Christian Bale") && theMehBatmans.contains("Michael Keaton"))
+        assertTrue(theMehBatmans.contains("Ben Affleck") && theMehBatmans.contains("George Clooney"))
+    }
+
+}