Added Btrfs class and fixed configurator select html element issues

test/zutil/osal/linux/app/BtrfsTest.java

@@ -0,0 +1,41 @@
+package zutil.osal.linux.app;
+
+import junit.framework.TestCase;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class BtrfsTest {
+
+    @Test
+    public void testGetScrubProgress() {
+    }
+
+    //@Test
+    public void testGetLastScrubDate() throws IOException, ParseException {
+        final String[] cmd = {null};
+
+        Btrfs btrfs = new Btrfs("/dev/sda1") {
+            public String execBtrfsCommand(String params, String path) throws IOException {
+                cmd[0] = params + " " + path;
+
+                return "scrub status for 3a6b2a74-05a9-464d-bbbd-15710c548f76\n" +
+                        "        scrub started at Fri Feb  4 00:29:54 2022 and finished after 58380 seconds\n" +
+                        "        total bytes scrubbed: 15.74TiB with 0 errors\n";
+            }
+        };
+
+        Date actualDate = btrfs.getLastScrubDate();
+        Date expectedDate = new SimpleDateFormat("dow mon dd hh:mm:ss zzz yyyy").parse("Fri Feb  4 00:29:54 2022");
+
+        assertEquals("scrub status /dev/sda1", cmd[0]);
+        assertTrue("Dates are not close enough to each other!",
+                Math.abs(expectedDate.getTime() - actualDate.getTime()) < 1000);
+    }
+}