Adapt tests to Java 21 date format change

Java 21 changed the date format to use a narrow no-break space, so the
regular expression used in the tests now fails to match. Changed the
test to use the '\h' character class, which matches.

jenkinsci/token-macro-plugin#191 uses the same
technique to handle test compatibility between Java 11, Java 17, and
Java 21.

Author: MarkEWaite

src/test/java/org/jenkinsci/plugins/schedulebuild/ScheduleBuildActionTest.java

@@ -3,6 +3,7 @@
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.endsWith;
+import static org.hamcrest.Matchers.matchesPattern;
 import static org.hamcrest.Matchers.nullValue;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -89,7 +90,7 @@ public void testSchedule() throws Exception {
 
     @Test
     public void testGetDefaultDate() throws Exception {
-        assertThat(scheduleBuildAction.getDefaultDate(), endsWith(" 10:00:00 PM"));
+        assertThat(scheduleBuildAction.getDefaultDate(), matchesPattern(".* 10:00:00\\hPM"));
     }
 
     @Test

src/test/java/org/jenkinsci/plugins/schedulebuild/ScheduleBuildGlobalConfigurationTest.java

@@ -2,6 +2,7 @@
 
 import static org.hamcrest.CoreMatchers.*;
 import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.Matchers.matchesPattern;
 import static org.junit.Assert.assertThrows;
 
 import java.time.ZoneId;
@@ -30,7 +31,7 @@ public void setUp() {
     @Test
     public void configRoundTripTestNoChanges() throws Exception {
         assertThat(globalConfig, is(not(nullValue())));
-        assertThat(globalConfig.getDefaultScheduleTime(), is("10:00:00 PM"));
+        assertThat(globalConfig.getDefaultScheduleTime(), matchesPattern("10:00:00\\hPM"));
         assertThat(globalConfig.getTimeZone(), is(TimeZone.getDefault().getID()));
 
         // Submit the global configuration page with no changes
@@ -39,7 +40,7 @@ public void configRoundTripTestNoChanges() throws Exception {
         ScheduleBuildGlobalConfiguration newGlobalConfig =
                 GlobalConfiguration.all().getInstance(ScheduleBuildGlobalConfiguration.class);
         assertThat(newGlobalConfig, is(not(nullValue())));
-        assertThat(newGlobalConfig.getDefaultScheduleTime(), is("10:00:00 PM"));
+        assertThat(newGlobalConfig.getDefaultScheduleTime(), matchesPattern("10:00:00\\hPM"));
         assertThat(newGlobalConfig.getTimeZone(), is(TimeZone.getDefault().getID()));
     }
 
@@ -79,14 +80,14 @@ public void testDoCheckTimeZone() throws Exception {
 
     @Test
     public void testGetDefaultScheduleTime() {
-        assertThat(globalConfig.getDefaultScheduleTime(), is("10:00:00 PM"));
+        assertThat(globalConfig.getDefaultScheduleTime(), matchesPattern("10:00:00\\hPM"));
     }
 
     @Test
     public void testSetDefaultScheduleTime() throws Exception {
         String defaultScheduleTime = "12:34:56 PM";
         globalConfig.setDefaultScheduleTime(defaultScheduleTime);
-        assertThat(globalConfig.getDefaultScheduleTime(), is(defaultScheduleTime));
+        assertThat(globalConfig.getDefaultScheduleTime(), matchesPattern("12:34:56\\hPM"));
     }
 
     @Test