解决特权时间段的Bug

src/test/java/com/rj/util/IsoWorkdayUtilsTest.java

@@ -0,0 +1,29 @@
+package com.rj.util;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class IsoWorkdayUtilsTest {
+
+    @Test
+    void may162026_isSaturday_weekend() {
+        LocalDate d = LocalDate.of(2026, 5, 16);
+        assertTrue(IsoWorkdayUtils.isWeekend(d), () -> "expected weekend, isoDow=" + IsoWorkdayUtils.isoDayOfWeek(d));
+    }
+
+    @Test
+    void may172026_isSunday_weekend() {
+        assertTrue(IsoWorkdayUtils.isWeekend(LocalDate.of(2026, 5, 17)));
+    }
+
+    /** 同年月日不同年份：2024-05-16 为周四，勿与 2026-05-16（周六）混淆。 */
+    @Test
+    void may162024_isThursday_notWeekend() {
+        LocalDate d = LocalDate.of(2024, 5, 16);
+        assertFalse(IsoWorkdayUtils.isWeekend(d), () -> "expected weekday, isoDow=" + IsoWorkdayUtils.isoDayOfWeek(d));
+    }
+}