BAEL-5801 - adding iterate list unit test (#12883)

* BAEL-5801 - adding iterate list unit test

* BAEL-5801 - replaced record to class

* BAEL-5801 - added spring data dependency

* moved source file in java17 module

* BAEL-5801 updated pom.xml configurations

* BAEL-5801 moved to correct java17 module

* updated example

* BAEL-5801 - making iterator instance strong typed

* BAEL-5801 - removed class example

core-java-modules/core-java-collections-list-4/pom.xml

@@ -62,6 +62,12 @@
             <version>${spring.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.data</groupId>
+            <artifactId>spring-data-commons</artifactId>
+            <version>2.7.5</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

core-java-modules/core-java-collections-list-4/src/test/java/com/baeldung/list/iteration/IterateListSimultaneouslyUnitTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.list.iteration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.data.util.StreamUtils;
+
+public class IterateListSimultaneouslyUnitTest {
+
+    final List<String> countryName = List.of("USA", "UK", "Germany", "India");
+    final List<String> countryCode = List.of("+1", "+44", "+49", "+91");
+
+    @Test
+    public void givenTwoLists_whenProcessedByZipping_thenGetJoinedDataFromBothCollections() {
+        List<String> processedList = StreamUtils.zip(countryName.stream(), countryCode.stream(),
+                                            (name, code) -> String.format("%s: %s", name, code))
+                                            .collect(Collectors.toList());
+        assertThat(processedList).containsExactly("USA: +1", "UK: +44", "Germany: +49", "India: +91");
+    }
+
+    @Test
+    public void givenTwoLists_whenIterateUsingIterator_thenGetJoinedDataFromBothCollections() {
+        Iterator<String> nameIterator = countryName.iterator();
+        Iterator<String> codeIterator = countryCode.iterator();
+        List<String> processedList = new ArrayList<>();
+        while (nameIterator.hasNext() && codeIterator.hasNext()) {
+            String processedData = String.format("%s: %s", nameIterator.next(), codeIterator.next());
+            processedList.add(processedData);
+        }
+        assertThat(processedList).containsExactly("USA: +1", "UK: +44", "Germany: +49", "India: +91");
+    }
+
+    @Test
+    public void givenTwoLists_whenIterateUsingLoop_thenGetJoinedDataFromBothCollections() {
+        List<String> processedList = new ArrayList<>();
+        for (int i = 0; i < countryName.size(); i++) {
+            String processedData = String.format("%s: %s", countryName.get(i), countryCode.get(i));
+            processedList.add(processedData);
+        }
+        assertThat(processedList).containsExactly("USA: +1", "UK: +44", "Germany: +49", "India: +91");
+    }
+
+}