Update ShellCommandExecutorTest.java

update unit test

dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/worker/shell/ShellCommandExecutorTest.java

@@ -20,11 +20,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.lang.reflect.Method;
-
-
 import org.apache.dolphinscheduler.common.Constants;
 import org.apache.dolphinscheduler.common.enums.ExecutionStatus;
-
 import org.apache.dolphinscheduler.common.utils.OSUtils;
 import org.apache.dolphinscheduler.dao.entity.TaskInstance;
 import org.apache.dolphinscheduler.server.worker.task.AbstractCommandExecutor;
@@ -42,7 +39,6 @@ import org.powermock.modules.junit4.PowerMockRunner;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.context.ApplicationContext;
-
 import java.util.Date;
 
 /**