Add failing test for issue #539

src/test/java/com/cronutils/Issue539Test.java

@@ -0,0 +1,52 @@
+package com.cronutils;
+
+import com.cronutils.model.Cron;
+import com.cronutils.model.definition.CronDefinitionBuilder;
+import com.cronutils.model.time.ExecutionTime;
+import com.cronutils.parser.CronParser;
+import org.junit.jupiter.api.Test;
+
+import java.time.ZonedDateTime;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue539Test {
+
+    private final CronParser parser = new CronParser(CronDefinitionBuilder.defineCron()
+            .withMinutes().and()
+            .withHours().and()
+            .withDayOfMonth().supportsL().and()
+            .withMonth().and()
+            .withDayOfWeek().and()
+            .instance());
+
+    @Test
+    public void testDOMWithListIncludingLastOfMonth() {
+        Cron cron = parser.parse("0 0 L,15 * *").validate();
+
+        ZonedDateTime thirdOfMonth = ZonedDateTime.parse("2022-04-03T00:00:00+00:00");
+        ZonedDateTime fifteenthOfMonth = ZonedDateTime.parse("2022-04-15T00:00:00+00:00");
+        ZonedDateTime twentiethOfMonth = ZonedDateTime.parse("2022-04-20T00:00:00+00:00");
+        ZonedDateTime thirtiethOfMonth = ZonedDateTime.parse("2022-04-30T00:00:00+00:00");
+
+
+        assertEquals(ExecutionTime.forCron(cron).nextExecution(thirdOfMonth).get(), fifteenthOfMonth);
+
+        // Fails
+        assertEquals(ExecutionTime.forCron(cron).nextExecution(twentiethOfMonth).get(), thirtiethOfMonth);
+    }
+
+    @Test
+    public void testDOMWithLastOfMonth() {
+        Cron cron = parser.parse("0 0 L * *").validate();
+
+        ZonedDateTime thirdOfMonth = ZonedDateTime.parse("2022-04-03T00:00:00+00:00");
+        ZonedDateTime twentiethOfMonth = ZonedDateTime.parse("2022-04-20T00:00:00+00:00");
+        ZonedDateTime thirtiethOfMonth = ZonedDateTime.parse("2022-04-30T00:00:00+00:00");
+
+
+        assertEquals(ExecutionTime.forCron(cron).nextExecution(thirdOfMonth).get(), thirtiethOfMonth);
+        assertEquals(ExecutionTime.forCron(cron).nextExecution(twentiethOfMonth).get(), thirtiethOfMonth);
+    }
+
+}