diff --git a/core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/replace/ReplaceStringUnitTest.java b/core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/replace/ReplaceStringUnitTest.java
new file mode 100644
index 0000000000..081ffabab1
--- /dev/null
+++ b/core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/replace/ReplaceStringUnitTest.java
@@ -0,0 +1,22 @@
+package com.baeldung.replace;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class ReplaceStringUnitTest {
+    private final String ORIGINAL_STRING = "This is 'Baeldung' tutorial.";
+    private final String EXPECTED_STRING = "This is \\'Baeldung\\' tutorial.";
+
+    @Test
+    public void givenString_thenReplaceUsinReplaceAllMethod() {
+        String modifiedString = ORIGINAL_STRING.replaceAll("'", "\\\\'");
+        assertEquals(EXPECTED_STRING, modifiedString);
+    }
+
+    @Test
+    public void givenString_thenReplaceUsinReplaceMethod() {
+        String modifiedString = ORIGINAL_STRING.replace("'", "\\'");
+        assertEquals(EXPECTED_STRING, modifiedString);
+    }
+}
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