From 683215b2fe3d1dcc29f0ea782fde9d7bced39bbd Mon Sep 17 00:00:00 2001
From: Vishal Akkalkote <10594502+vishal1023@users.noreply.github.com>
Date: Fri, 20 Nov 2020 05:56:15 +0530
Subject: [PATCH] =?UTF-8?q?BAEL-4600=20|=20Add=20examples=20to=20demonstra?=
 =?UTF-8?q?te=20the=20difference=20between=20Array=20=E2=80=A6=20(#10211)?=
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* BAEL-4600 | Add examples to demonstrate the difference between Array Size vs ArrayList Capacity

* BAEL-4600 | Refactor | Remove ArrayCreator and ArrayListCreator
---
 .../ArrayCreatorUnitTest.java                 | 20 ++++++++++++++
 .../ArrayListCreatorUnitTest.java             | 27 +++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayCreatorUnitTest.java
 create mode 100644 core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayListCreatorUnitTest.java

diff --git a/core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayCreatorUnitTest.java b/core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayCreatorUnitTest.java
new file mode 100644
index 0000000000..74c8b93872
--- /dev/null
+++ b/core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayCreatorUnitTest.java
@@ -0,0 +1,20 @@
+package com.baeldung.listcapacityvsarraysize;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class ArrayCreatorUnitTest {
+
+    @Test
+    void whenSizeOfAnArrayIsNonZero_thenReturnNewArrayOfGivenSize() {
+        Integer[] array = new Integer[10];
+        assertEquals(10, array.length);
+    }
+
+    @Test
+    void whenSizeOfAnArrayIsLessThanZero_thenThrowException() {
+        assertThrows(NegativeArraySizeException.class, () -> { Integer[] array = new Integer[-1]; });
+    }
+}
\ No newline at end of file
diff --git a/core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayListCreatorUnitTest.java b/core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayListCreatorUnitTest.java
new file mode 100644
index 0000000000..62efe43af4
--- /dev/null
+++ b/core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/listcapacityvsarraysize/ArrayListCreatorUnitTest.java
@@ -0,0 +1,27 @@
+package com.baeldung.listcapacityvsarraysize;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ArrayListCreatorUnitTest {
+
+    @Test
+    void givenValidCapacityOfList_whenCreateListInvoked_thenCreateNewArrayListWithGivenCapacity() {
+        ArrayList<Integer> list = new ArrayList<>(100);
+
+        assertNotNull(list);
+    }
+
+    @Test
+    void givenInvalidCapacityOfList_whenCreateListInvoked_thenThrowException() {
+        assertThrows(IllegalArgumentException.class, () -> new ArrayList<>(-1));
+    }
+
+    @Test
+    void givenValidCapacityOfList_whenCreateListInvoked_thenCreateNewArrayListWithSizeZero() {
+        assertEquals(0, new ArrayList<Integer>(100).size());
+    }
+}
\ No newline at end of file