dom/src/test/java/org/apache/james/mime4j/field/datetime/DateTimeTest.java

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package org.apache.james.mime4j.field.datetime;

import static org.assertj.core.api.Assertions.assertThat;

import org.apache.james.mime4j.MimeException;
import org.apache.james.mime4j.field.datetime.parser.DateTimeParser;
import org.apache.james.mime4j.field.datetime.parser.ParseException;
import org.junit.Assert;
import org.junit.Test;

import java.io.StringReader;

public class DateTimeTest {

    @Test
    public void testExceptionTree() {
        // make sure that our ParseException extends MimeException.
        Assert.assertTrue(MimeException.class.isAssignableFrom(ParseException.class));
    }

    @Test
    public void testNormalDate() throws ParseException {
        new DateTimeParser(new StringReader("Fri, 21 Nov 1997 09:55:06 -0600")).parseAll();
        new DateTimeParser(new StringReader("21 Nov 97 09:55:06 GMT")).parseAll();


        ensureAllEqual(new String[]{
                "Fri, 21 Nov 1997 09:55:06 -0600", // baseline
                "Fri, 21 Nov 97 09:55:06 -0600",   // 2-digit year
                "Fri, 21 Nov 097 09:55:06 -0600",  // 3-digit year
                "Fri, 21 Nov 1997 10:55:06 -0500", // shift time zone
                "Fri, 21 Nov 1997 19:25:06 +0330", // shift time zone
                "21 Nov 1997 09:55:06 -0600"       // omit day of week
        });

        ensureAllEqual(new String[]{
                "Thu, 16 Sep 2019 14:37:22 +0000", // baseline
                "Thu, 16 Sep 19 14:37:22 +0000",   // 2-digit year
                "Thu, 16 Sep 119 14:37:22 +0000",  // 3-digit year
                "Thu, 16 Sep 2019 14:37:22 -0000", // minus-zero zone
                "Thu, 16 Sep 2019 14:37:22 GMT",   // alternate zone
                "Thu, 16 Sep 2019 14:37:22 UT"     // alternate zone
        });

        ensureAllEqual(new String[]{
                "Fri, 21 Nov 1997 12:00:00 GMT",
                "Fri, 21 Nov 1997 07:00:00 EST",
                "Fri, 21 Nov 1997 08:00:00 EDT",
                "Fri, 21 Nov 1997 06:00:00 CST",
                "Fri, 21 Nov 1997 07:00:00 CDT",
                "Fri, 21 Nov 1997 05:00:00 MST",
                "Fri, 21 Nov 1997 06:00:00 MDT",
                "Fri, 21 Nov 1997 04:00:00 PST",
                "Fri, 21 Nov 1997 05:00:00 PDT",

                // make sure military zones are ignored, per RFC2822 instructions
                "Fri, 21 Nov 1997 12:00:00 A",
                "Fri, 21 Nov 1997 12:00:00 B",
                "Fri, 21 Nov 1997 12:00:00 C",
                "Fri, 21 Nov 1997 12:00:00 D",
                "Fri, 21 Nov 1997 12:00:00 E",
                "Fri, 21 Nov 1997 12:00:00 F",
                "Fri, 21 Nov 1997 12:00:00 G",
                "Fri, 21 Nov 1997 12:00:00 H",
                "Fri, 21 Nov 1997 12:00:00 I",
                "Fri, 21 Nov 1997 12:00:00 K",
                "Fri, 21 Nov 1997 12:00:00 L",
                "Fri, 21 Nov 1997 12:00:00 M",
                "Fri, 21 Nov 1997 12:00:00 N",
                "Fri, 21 Nov 1997 12:00:00 O",
                "Fri, 21 Nov 1997 12:00:00 P",
                "Fri, 21 Nov 1997 12:00:00 Q",
                "Fri, 21 Nov 1997 12:00:00 R",
                "Fri, 21 Nov 1997 12:00:00 S",
                "Fri, 21 Nov 1997 12:00:00 T",
                "Fri, 21 Nov 1997 12:00:00 U",
                "Fri, 21 Nov 1997 12:00:00 V",
                "Fri, 21 Nov 1997 12:00:00 W",
                "Fri, 21 Nov 1997 12:00:00 X",
                "Fri, 21 Nov 1997 12:00:00 Y",
                "Fri, 21 Nov 1997 12:00:00 Z",
        });
    }

    private void ensureAllEqual(String[] dateStrings) throws ParseException {
        for (int i = 0; i < dateStrings.length - 1; i++) {
            long date1 = new DateTimeParser(new StringReader(dateStrings[i])).parseAll().getDate().getTime();
            long date2 = new DateTimeParser(new StringReader(dateStrings[i + 1])).parseAll().getDate().getTime();
            assertThat(date1)
                .as(dateStrings[i] + " == " + dateStrings[i + 1])
                .isEqualTo(date2);
        }
    }

}