opencsv Source

import org.apache.commons.lang3.time.DateFormatUtils;

import org.junit.jupiter.api.*;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class SimpeDateFormatVsDateFormatUtilsTest {
    private static final int LOOP_SIZE = 1000000;
    private static final int ARRAY_SIZE = 100;
    private static final String DEFAULT_DATE_FORMAT = "dd-MMM-yyyy";

    private static List<Date> testDates = new ArrayList<>(ARRAY_SIZE);

    @BeforeAll
    public static void init() {
        System.out.println("before all method called.");
        Random random = new Random();
        for (int i = 0; i < ARRAY_SIZE; i++) {
            Date date = new Date(random.nextLong());
            testDates.add(date);
        }
        System.out.println("arraysize: " + testDates.size());
    }

    @BeforeEach
    public void stressTheSystem() {
        DateFormatUtils dateFormat = new DateFormatUtils();

        for (int i = 0; i < 1000; i++) {
            String dateString = dateFormat.format(testDates.get(i%ARRAY_SIZE), "mm-dd-yyyy");
        }
    }

    @Order(1)
    @Test
    public void didInitializationHappen() {
        assertEquals(ARRAY_SIZE, testDates.size());
    }

    @Order(20)
    @Test
    public void stressSystem() {
        SimpleDateFormat dateFormat = new SimpleDateFormat(DEFAULT_DATE_FORMAT);
        DateFormatUtils dateFormat2 = new DateFormatUtils();

        for (int i = 0; i < LOOP_SIZE*2; i++) {
            String dateString = dateFormat.format(testDates.get(i%ARRAY_SIZE));
            assertNotNull(dateString);
            dateString = dateFormat2.format(testDates.get(i%ARRAY_SIZE), DEFAULT_DATE_FORMAT);
            assertNotNull(dateString);
        }
    }

    @Order(4)
    @RepeatedTest(5)
    @Test
    public void simpleDateFormatTest() {
        SimpleDateFormat dateFormat = new SimpleDateFormat(DEFAULT_DATE_FORMAT);

        for (int i = 0; i < LOOP_SIZE; i++) {
            String dateString = dateFormat.format(testDates.get(i%ARRAY_SIZE));
            assertNotNull(dateString);
        }
    }


    @Order(3)
    @RepeatedTest(5)
    @Test
    public void dateFormatUtilsTest() {
        DateFormatUtils dateFormat = new DateFormatUtils();

        for (int i = 0; i < LOOP_SIZE; i++) {
            String dateString = dateFormat.format(testDates.get(i%ARRAY_SIZE), DEFAULT_DATE_FORMAT);
            assertNotNull(dateString);
        }
    }

}