@Test
public void getNumSetBits_TestOffsetChecking() {
assertEquals(8, NumSetBits.getNumSetBits((byte) 255, 0, 7));
assertEquals(6, NumSetBits.getNumSetBits((byte) 255, 1, 6));
assertEquals(4, NumSetBits.getNumSetBits((byte) 255, 2, 5));
assertEquals(2, NumSetBits.getNumSetBits((byte) 255, 3, 4));
assertEquals(1, NumSetBits.getNumSetBits((byte) 255, 4, 4));
}
@Test
public void getNumSetBits_TestAllBytes() {
for (int number = 0; number <= 255; number++) {
int expected = 0;
for (char c : Integer.toBinaryString(number).toCharArray()) {
if (c == '1') {
expected++;
}
}
assertEquals(expected, NumSetBits.getNumSetBits((byte) number, 0, 7));
}
}
@Test
public void getNumSetBits_ByteArrayWithOffsetAndLength() {
byte[] array = new byte[] {(byte) 100, (byte) 255, (byte) 255, (byte) 175};
assertEquals(1, NumSetBits.getNumSetBits(array, 3, 3));
assertEquals(20, NumSetBits.getNumSetBits(array, 3, 26));
}
@Test
public void getNumSetBits_ByteArray() {
byte[] array = new byte[] {(byte) 100, (byte) 255, (byte) 255, (byte) 175};
assertEquals(25, NumSetBits.getNumSetBitsBetweenWholeBytes(array, 0, 3));
assertEquals(16, NumSetBits.getNumSetBitsBetweenWholeBytes(array, 1, 2));
}