INT-3827: Fix Test Case

Clean up file before/after.

spring-integration-sftp/src/test/java/org/springframework/integration/sftp/inbound/RollbackLocalFilterTests.java

@@ -23,6 +23,8 @@ import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -39,6 +41,12 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 @RunWith(SpringJUnit4ClassRunner.class)
 public class RollbackLocalFilterTests {
 
+	@BeforeClass
+	@AfterClass
+	public static void clean() {
+		new File("local-test-dir/rollback/sftpSource1.txt").delete();
+	}
+
 	@Autowired
 	private Crash crash;