bael-2022 initialize array in kotlin (#5529)

* bael-2022 initialize array in kotlin

* bael-2022 formatting with eclipse

* bael-2022 formatting fix

core-kotlin/src/test/kotlin/com/baeldung/kotlin/ArrayInitializationTest.kt

@@ -0,0 +1,49 @@
+package com.baeldung.kotlin
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class ArrayInitializationTest {
+
+    @Test
+    fun givenArrayOfStrings_thenValuesPopulated() {
+        val strings = arrayOf("January", "February", "March")
+
+        assertEquals(3, strings.size)
+        assertEquals("March", strings[2])
+    }
+
+    @Test
+    fun givenArrayOfIntegers_thenValuesPopulated() {
+        val integers = intArrayOf(1, 2, 3, 4)
+
+        assertEquals(4, integers.size)
+        assertEquals(1, integers[0])
+    }
+
+    @Test
+    fun givenArrayOfNulls_whenPopulated_thenValuesPresent() {
+        val array = arrayOfNulls<Number>(5)
+
+        for (i in array.indices) {
+            array[i] = i * i
+        }
+
+        assertEquals(16, array[4])
+    }
+
+    @Test
+    fun whenGeneratorUsed_thenValuesPresent() {
+        val generatedArray = IntArray(10) { i -> i * i }
+
+        assertEquals(81, generatedArray[9])
+    }
+
+    @Test
+    fun whenStringGenerated_thenValuesPresent() {
+        val generatedStringArray = Array(10) { i -> "Number of index: $i"  }
+
+        assertEquals("Number of index: 0", generatedStringArray[0])
+    }
+
+}