Update FileUtilsTest.java

Author: mercyblitz

microsphere-java-core/src/test/java/io/microsphere/io/FileUtilsTest.java

@@ -11,7 +11,6 @@
 import java.io.IOException;
 import java.net.URL;
 import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -30,7 +29,6 @@
 import static io.microsphere.util.SystemUtils.IS_OS_WINDOWS;
 import static io.microsphere.util.SystemUtils.JAVA_IO_TMPDIR;
 import static java.lang.Thread.sleep;
-import static java.util.concurrent.Executors.newFixedThreadPool;
 import static java.util.concurrent.Executors.newSingleThreadExecutor;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;