From b07bcce7efcdf939dd336b2dceabbb88449b89b9 Mon Sep 17 00:00:00 2001
From: Ali Dehghani <ali.dehghani.g@gmail.com>
Date: Tue, 2 Jun 2020 22:03:54 +0430
Subject: [PATCH] Introducing Integer Cache

---
 .../stringtoint/StringToIntOrIntegerUnitTest.java     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntOrIntegerUnitTest.java b/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntOrIntegerUnitTest.java
index 106f1fc974..336b2ac324 100644
--- a/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntOrIntegerUnitTest.java
+++ b/core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntOrIntegerUnitTest.java
@@ -26,6 +26,17 @@ public class StringToIntOrIntegerUnitTest {
         assertThat(result).isEqualTo(new Integer(42));
     }
 
+    @Test
+    public void givenString_whenCallingValueOf_shouldCacheSomeValues() {
+        for (int i = -128; i <= 127; i++) {
+            String value = i + "";
+            Integer first = Integer.valueOf(value);
+            Integer second = Integer.valueOf(value);
+
+            assertThat(first).isSameAs(second);
+        }
+    }
+
     @Test
     public void givenString_whenCallingIntegerConstructor_shouldConvertToInt() {
         String givenString = "42";