SOLR-17618: Incorporate feedback from review

* Add @test annotations
* Move repeated mock setup to Before method

solr/core/src/test/org/apache/solr/util/TimeOutTest.java

@@ -23,42 +23,41 @@
 import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.common.util.TimeSource;
 import org.junit.BeforeClass;
+import org.junit.Test;
 
 public class TimeOutTest extends SolrTestCaseJ4 {
+  private static TimeSource mockTimeSource;
 
   @BeforeClass
   public static void setUpOnce() {
     assumeWorkingMockito();
+    mockTimeSource = mock(TimeSource.class);
   }
 
+  @Test
   public void testHasTimedOut() {
-    TimeSource mockTimeSource = mock(TimeSource.class);
     when(mockTimeSource.getTimeNs()).thenReturn(Long.valueOf(10)).thenReturn(Long.valueOf(50));
-
     TimeOut timeOut = new TimeOut(20, NANOSECONDS, mockTimeSource);
     assertTrue(timeOut.hasTimedOut());
   }
 
+  @Test
   public void testHasNotTimedOut() {
-    TimeSource mockTimeSource = mock(TimeSource.class);
     when(mockTimeSource.getTimeNs()).thenReturn(Long.valueOf(10)).thenReturn(Long.valueOf(11));
-
     TimeOut timeOut = new TimeOut(20, NANOSECONDS, mockTimeSource);
     assertFalse(timeOut.hasTimedOut());
   }
 
+  @Test
   public void testTimeLeft() {
-    TimeSource mockTimeSource = mock(TimeSource.class);
     when(mockTimeSource.getTimeNs()).thenReturn(Long.valueOf(10)).thenReturn(Long.valueOf(15));
-
     TimeOut timeOut = new TimeOut(90, NANOSECONDS, mockTimeSource);
     assertEquals(timeOut.timeLeft(NANOSECONDS), 85);
   }
 
+  @Test
   public void testTimeElapsed() {
-    TimeSource mockTimeSource = mock(TimeSource.class);
     when(mockTimeSource.getTimeNs()).thenReturn(Long.valueOf(10)).thenReturn(Long.valueOf(25));
-
     TimeOut timeOut = new TimeOut(70, NANOSECONDS, mockTimeSource);
     assertEquals(timeOut.timeElapsed(NANOSECONDS), 15);
   }