[BAEL-3934]shedlock update

spring-boot-modules/spring-boot-libraries/src/test/java/com/baeldung/scheduling/shedlock/BaeldungTaskSchedulerIntegrationTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.scheduling.shedlock;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class BaeldungTaskSchedulerIntegrationTest {
+    @Autowired
+    private BaeldungTaskScheduler taskScheduler;
+
+    @Test
+    public void whenShedLockConfigCorrect_thenSpringCtxtStartsWithoutError() {
+        // save the old out
+        PrintStream old = System.out;
+
+        // Create a stream to hold the output for test
+        ByteArrayOutputStream consoleOutput = new ByteArrayOutputStream();
+        PrintStream ps = new PrintStream(consoleOutput);
+        System.setOut(ps);
+        //test
+        taskScheduler.scheduledTask();
+        System.out.flush();
+        String expected = "Running ShedLock task\n";
+        assertThat(consoleOutput.toString()).isEqualTo(expected);
+
+        //restore the old out
+        System.setOut(old);
+    }
+
+}