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/*
* Copyright (c) 2009, Chris Miller
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
package uk.me.parabola.splitter;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
/**
* Unit tests for the rounding up/down utility methods.
*/
public class RoundingTest
{
@Test
public void testPositiveRoundingDown
() {
for (int i =
0; i
< 50000; i +=
19) {
testRoundDown
(i,
11, i /
2048 * 2048);
}
testRoundDown
(0x1d5842,
11, 0x1d5800
);
testRoundDown
(0x2399a,
11, 0x23800
);
testRoundDown
(0x23800,
11, 0x23800
);
testRoundDown
(0x237f0,
11, 0x23000
);
}
@Test
public void testPositiveRoundingUp
() {
for (int i =
0; i
< 50000; i +=
19) {
testRoundUp
(i,
11,
(i +
2047) /
2048 * 2048);
}
testRoundUp
(0x1e7faa,
11, 0x1e8000
);
testRoundUp
(0x1e7801,
11, 0x1e8000
);
testRoundUp
(0x1e7800,
11, 0x1e7800
);
testRoundUp
(0x1e70aa,
11, 0x1e7800
);
testRoundUp
(0x1e77ff,
11, 0x1e7800
);
}
@Test
public void testNegativeRoundingDown
() {
testRoundDown
(0xffcbba86,
11, 0xffcbb800
);
testRoundDown
(0xffcbbfff,
11, 0xffcbb800
);
testRoundDown
(0xffcbb801,
11, 0xffcbb800
);
testRoundDown
(0xffcbb7ff,
11, 0xffcbb000
);
}
@Test
public void testNegativeRoundingUp
() {
testRoundUp
(0xffcbba86,
11, 0xffcbc000
);
testRoundUp
(0xffcbbfff,
11, 0xffcbc000
);
testRoundUp
(0xffcbb801,
11, 0xffcbc000
);
testRoundUp
(0xffcbb7ff,
11, 0xffcbb800
);
testRoundUp
(Integer.
MIN_VALUE +
1234,
11, 0x80000800
);
}
@Test
public void testRound
() {
testRound
(7,
2,
8);
testRound
(6,
2,
8);
testRound
(5,
2,
4);
testRound
(4,
2,
4);
testRound
(3,
2,
4);
testRound
(2,
2,
4);
testRound
(1,
2,
0);
testRound
(0,
2,
0);
testRound
(-
1,
2,
0);
testRound
(-
2,
2,
0);
testRound
(-
3,
2, -
4);
testRound
(-
4,
2, -
4);
testRound
(-
5,
2, -
4);
}
private static void testRoundDown
(int value,
int shift,
int outcome
) {
assertEquals
(
"Before: " +
Integer.
toHexString(value
) +
", After: "
+
Integer.
toHexString(RoundingUtils.
roundDown(value, shift
)),
outcome, RoundingUtils.
roundDown(value, shift
));
}
private static void testRoundUp
(int value,
int shift,
int outcome
) {
assertEquals
(
"Before: " +
Integer.
toHexString(value
) +
", After: "
+
Integer.
toHexString(RoundingUtils.
roundUp(value, shift
)),
outcome, RoundingUtils.
roundUp(value, shift
));
}
private static void testRound
(int value,
int shift,
int outcome
) {
assertEquals
(
"Before: " +
Integer.
toHexString(value
) +
", After: "
+
Integer.
toHexString(RoundingUtils.
round(value, shift
)),
outcome, RoundingUtils.
round(value, shift
));
}
}