From a87d4fbdb3544eea261b3c3df2ec0449bcf7b6ab Mon Sep 17 00:00:00 2001
From: MohamedHelmyKassab
 <137485958+MohamedHelmyKassab@users.noreply.github.com>
Date: Thu, 21 Dec 2023 06:58:07 +0200
Subject: [PATCH] This commit is related to BAEL-7342 (#15460)

This commit aims to add a test class "CheckIfStringBuilderContainsCharUnitTest" that suggests several ways to check if a StringBuilder has a char or not.
---
 ...ckIfStringBuilderContainsCharUnitTest.java | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 core-java-modules/core-java-string-operations-7/src/test/java/com/baeldung/stringbuilderhaschar/CheckIfStringBuilderContainsCharUnitTest.java

diff --git a/core-java-modules/core-java-string-operations-7/src/test/java/com/baeldung/stringbuilderhaschar/CheckIfStringBuilderContainsCharUnitTest.java b/core-java-modules/core-java-string-operations-7/src/test/java/com/baeldung/stringbuilderhaschar/CheckIfStringBuilderContainsCharUnitTest.java
new file mode 100644
index 0000000000..8d95b5533a
--- /dev/null
+++ b/core-java-modules/core-java-string-operations-7/src/test/java/com/baeldung/stringbuilderhaschar/CheckIfStringBuilderContainsCharUnitTest.java
@@ -0,0 +1,44 @@
+package com.baeldung.stringbuilderhaschar;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class CheckIfStringBuilderContainsCharUnitTest {
+
+    StringBuilder stringBuilder = new StringBuilder("Welcome to Baeldung Java Tutorial!");
+    char targetChar = 'o';
+
+    @Test
+    public void givenStringBuilder_whenUsingIndexOfMethod_thenCheckIfSCharExists() {
+        int index = stringBuilder.indexOf(String.valueOf(targetChar));
+        assertTrue(index != -1);
+    }
+
+    @Test
+    public void givenStringBuilder_whenUsingContainsMethod_thenCheckIfSCharExists() {
+        boolean containsChar = stringBuilder.toString().contains(String.valueOf(targetChar));
+        assertTrue(containsChar);
+    }
+
+    @Test
+    public void givenStringBuilder_whenUsingJavaStream_thenCheckIfSCharExists() {
+        boolean charFound = stringBuilder.chars().anyMatch(c -> c == targetChar);
+
+        assertTrue(charFound);
+    }
+
+    @Test
+    public void givenStringBuilder_whenUsingIterations_thenCheckIfSCharExists() {
+        boolean charFound = false;
+
+        for (int i = 0; i < stringBuilder.length(); i++) {
+            if (stringBuilder.charAt(i) == targetChar) {
+                charFound = true;
+                break;
+            }
+        }
+
+        assertTrue(charFound);
+    }
+}