Added list creation and unit tests

core-kotlin-modules/core-kotlin-collections/src/main/kotlin/com/baeldung/collections/ListExample.kt

@@ -0,0 +1,13 @@
+package com.baeldung.collections
+
+import kotlin.collections.List
+
+class ListExample {
+    fun createList(): List<String> {
+        return listOf("one", "two", "three")
+    }
+
+    fun createMutableList(): MutableList<String> {
+        return mutableListOf("Berlin", "Kolkata", "London")
+    }
+}

core-kotlin-modules/core-kotlin-collections/src/test/kotlin/com/baeldung/collections/ListExampleUnitTest.kt

@@ -0,0 +1,18 @@
+package com.baeldung.collections
+
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotEquals
+import kotlin.test.assertTrue
+
+class ListExampleUnitTest {
+
+    private val classUnderTest: ListExample = ListExample()
+
+    @Test
+    fun whenListIsCreated_thenContainsElements() {
+        assertTrue(classUnderTest.createList().contains("two"))
+        assertTrue(classUnderTest.createMutableList().contains("Berlin"))
+    }
+
+}