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package org.apache.tools.zip;

import junit.framework.TestCase;

/**
 * JUnit 3 testcases for org.apache.tools.zip.ZipLong.
 *
 * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a> 
 */
public class ZipLongTest extends TestCase {

    public ZipLongTest(String name) {
        super(name);
    }

    /**
     * Test conversion to bytes.
     */
    public void testToBytes() {
        ZipLong zl = new ZipLong(0x12345678);
        byte[] result = zl.getBytes();
        assertEquals("length getBytes", 4, result.length);
        assertEquals("first byte getBytes", 0x78, result[0]);
        assertEquals("second byte getBytes", 0x56, result[1]);
        assertEquals("third byte getBytes", 0x34, result[2]);
        assertEquals("fourth byte getBytes", 0x12, result[3]);
    }

    /**
     * Test conversion from bytes.
     */
    public void testFromBytes() {
        byte[] val = new byte[] {0x78, 0x56, 0x34, 0x12};
        ZipLong zl = new ZipLong(val);
        assertEquals("value from bytes", 0x12345678, zl.getValue());
    }

    /**
     * Test the contract of the equals method.
     */
    public void testEquals() {
        ZipLong zl = new ZipLong(0x12345678);
        ZipLong zl2 = new ZipLong(0x12345678);
        ZipLong zl3 = new ZipLong(0x87654321);

        assert("reflexive", zl.equals(zl));

        assert("works", zl.equals(zl2));
        assert("works, part two", !zl.equals(zl3));

        assert("symmetric", zl2.equals(zl));

        assert("null handling", !zl.equals(null));
        assert("non ZipLong handling", !zl.equals(new Integer(0x1234)));
    }

    /**
     * Test sign handling.
     */
    public void testSign() {
        ZipLong zl = new ZipLong(new byte[] {(byte)0xFF, (byte)0xFF, (byte)0xFF, (byte)0xFF});
        assertEquals(0x00000000FFFFFFFFl, zl.getValue());
    }

}
