BAEL-5925 Code for the finding max date in object list article

2022-11-06 12:22:39 +01:00
parent 4744ca53b9
commit d10014534b
4 changed files with 192 additions and 0 deletions
--- a/core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/maxdate/DateHelperUnitTest.java
+++ b/core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/maxdate/DateHelperUnitTest.java
@@ -0,0 +1,109 @@
+package com.baeldung.streams.maxdate;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import java.time.LocalDate;
+import java.util.Date;
+import java.util.List;
+
+import org.apache.commons.lang3.time.DateUtils;
+import org.junit.jupiter.api.Test;
+
+class DateHelperUnitTest {
+
+    Date TODAY = new Date();
+    Event TODAYS_EVENT = new Event(TODAY);
+    Date TOMORROW = DateUtils.addDays(TODAY, 1);
+    Event TOMORROWS_EVENT = new Event(TOMORROW);
+    Date NEXT_WEEK = DateUtils.addDays(TODAY, 7);
+    Event NEXT_WEEK_EVENT = new Event(NEXT_WEEK);
+
+    LocalDate TODAY_LOCAL = LocalDate.now();
+    LocalEvent TODAY_LOCAL_EVENT = new LocalEvent(TODAY_LOCAL);
+    LocalDate TOMORROW_LOCAL = TODAY_LOCAL.plusDays(1);
+    LocalEvent TOMORROW_LOCAL_EVENT = new LocalEvent(TOMORROW_LOCAL);
+    LocalDate NEXT_WEEK_LOCAL = TODAY_LOCAL.plusWeeks(1);
+    LocalEvent NEXT_WEEK_LOCAL_EVENT = new LocalEvent(NEXT_WEEK_LOCAL);
+
+    @Test
+    void givenNullEventList_WhenFindMaxDateOf_ThenNull() {
+        assertNull(DateHelper.findMaxDateOf(null));
+    }
+
+    @Test
+    void givenEmptyEventList_WhenFindMaxDateOf_ThenNull() {
+        assertNull(DateHelper.findMaxDateOf(List.of()));
+    }
+
+    @Test
+    void givenSingleElementEventList_WhenFindMaxDateOf_ThenReturnElementDate() {
+        assertEquals(TODAY, DateHelper.findMaxDateOf(List.of(TODAYS_EVENT)));
+    }
+
+    @Test
+    void givenEventList_WhenFindMaxDateOf_ThenReturnMaxDate() {
+        assertEquals(NEXT_WEEK, DateHelper.findMaxDateOf(List.of(TODAYS_EVENT, TOMORROWS_EVENT, NEXT_WEEK_EVENT)));
+    }
+
+    @Test
+    void givenNullEventList_WhenFindMaxDateOfWithComparator_ThenNull() {
+        assertNull(DateHelper.findMaxDateOfWithComparator(null));
+    }
+
+    @Test
+    void givenEmptyEventList_WhenFindMaxDateOfWithComparator_ThenNull() {
+        assertNull(DateHelper.findMaxDateOfWithComparator(List.of()));
+    }
+
+    @Test
+    void givenSingleElementEventList_WhenFindMaxDateOfWithComparator_ThenReturnElementDate() {
+        assertEquals(TODAY, DateHelper.findMaxDateOfWithComparator(List.of(TODAYS_EVENT)));
+    }
+
+    @Test
+    void givenEventList_WhenFindMaxDateOfWithComparator_ThenReturnMaxDate() {
+        assertEquals(NEXT_WEEK, DateHelper.findMaxDateOfWithComparator(List.of(TODAYS_EVENT, TOMORROWS_EVENT, NEXT_WEEK_EVENT)));
+    }
+
+    @Test
+    void givenNullLocalEventList_WhenFindMaxDateOfLocalEvents_ThenNull() {
+        assertNull(DateHelper.findMaxDateOfLocalEvents(null));
+    }
+
+    @Test
+    void givenEmptyLocalEventList_WhenFindMaxDateOfLocalEvents_ThenNull() {
+        assertNull(DateHelper.findMaxDateOfLocalEvents(List.of()));
+    }
+
+    @Test
+    void givenSingleElementLocalEventList_WhenFindMaxDateOfLocalEvents_ThenReturnElementDate() {
+        assertEquals(TODAY_LOCAL, DateHelper.findMaxDateOfLocalEvents(List.of(TODAY_LOCAL_EVENT)));
+    }
+
+    @Test
+    void givenLocalEventList_WhenFindMaxDateOfLocalEvents_ThenReturnMaxDate() {
+        assertEquals(NEXT_WEEK_LOCAL, DateHelper.findMaxDateOfLocalEvents(List.of(TODAY_LOCAL_EVENT, TOMORROW_LOCAL_EVENT, NEXT_WEEK_LOCAL_EVENT)));
+    }
+
+    @Test
+    void givenNullLocalEventList_WhenFindMaxDateOfLocalEventsWithComparator_ThenNull() {
+        assertNull(DateHelper.findMaxDateOfLocalEventsWithComparator(null));
+    }
+
+    @Test
+    void givenEmptyLocalEventList_WhenFindMaxDateOfLocalEventsWithComparator_ThenNull() {
+        assertNull(DateHelper.findMaxDateOfLocalEventsWithComparator(List.of()));
+    }
+
+    @Test
+    void givenSingleElementLocalEventList_WhenFindMaxDateOfLocalEventsWithComparator_ThenReturnElementDate() {
+        assertEquals(TODAY_LOCAL, DateHelper.findMaxDateOfLocalEventsWithComparator(List.of(TODAY_LOCAL_EVENT)));
+    }
+
+    @Test
+    void givenLocalEventList_WhenFindMaxDateOfLocalEventsWithComparator_ThenReturnMaxDate() {
+        assertEquals(NEXT_WEEK_LOCAL, DateHelper.findMaxDateOfLocalEventsWithComparator(List.of(TODAY_LOCAL_EVENT, TOMORROW_LOCAL_EVENT, NEXT_WEEK_LOCAL_EVENT)));
+    }
+
+}