BAEL-4437 - System Rules (#10047)

Co-authored-by: Jonathan Cook <jcook@sciops.esa.int>

testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemInUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.systemrules;
+
+import static com.github.stefanbirkner.systemlambda.SystemLambda.withTextFromSystemIn;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Scanner;
+
+import org.junit.jupiter.api.Test;
+
+class SystemInUnitTest {
+
+    @Test
+    void givenTwoNames_whenSystemInMock_thenNamesJoinedTogether() throws Exception {
+        withTextFromSystemIn("Jonathan", "Cook").execute(() -> {
+            assertEquals("Names should be concatenated", "Jonathan Cook", getFullname());
+        });
+    }
+
+    private String getFullname() {
+        try (Scanner scanner = new Scanner(System.in)) {
+            String firstName = scanner.next();
+            String surname = scanner.next();
+            return String.join(" ", firstName, surname);
+        }
+    }
+
+}