Fix typo

testing-modules/junit-4/src/main/java/com/baeldung/junit/Calculator.java

@@ -0,0 +1,11 @@
+package com.baeldung.junit;
+
+public class Calculator {
+    public int add(int a, int b) {
+        return a + b;
+    }
+
+    public int sub(int a, int b) {
+        return a - b;
+    }
+}

testing-modules/junit-4/src/main/java/com/baeldung/junitparams/SafeAdditionUtil.java

@@ -0,0 +1,15 @@
+package com.baeldung.junitparams;
+
+public class SafeAdditionUtil {
+
+    public int safeAdd(int a, int b) {
+        long result = ((long) a) + b;
+        if (result > Integer.MAX_VALUE) {
+            return Integer.MAX_VALUE;
+        } else if (result < Integer.MIN_VALUE) {
+            return Integer.MIN_VALUE;
+        }
+        return (int) result;
+    }
+
+}

testing-modules/junit-4/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>