@Test
public void convertedByteWillMoveSignBit() {
byte bNum = (byte) 255;
int iNum = 255;
Th.Value(iNum).ShouldEqual(255);
iNum = bNum;
Th.Value(iNum).ShouldEqual(-1);
Th.Value(BitFiddler.UByte(iNum)).ShouldEqual(255);
}
@Test
public void canBuildMask() throws Exception {
int num = BitFiddler.BuildMask(8, 6);
Th.Value(num).ShouldEqual(16515072);
num = BitFiddler.BuildMask(14, 6);
Th.Value(num).ShouldEqual(258048);
num = BitFiddler.BuildMask(20, 6);
Th.Value(num).ShouldEqual(4032);
num = BitFiddler.BuildMask(26, 6);
Th.Value(num).ShouldEqual(63);
}
@Test
public void canGetByteWhenLengthGreaterThanAvailableSpace() throws Exception {
byte[] buff = new byte[] {(byte) 255};
int actual = BitFiddler.GetByteAt(buff, 6, 6);
int expected = BitFiddler.UByte(48);
Th.Value(expected).ShouldEqual(actual);
}
@Test
public void canGetByteAt() throws Exception {
byte[] buff = new byte[] {(byte) 255, 0, (byte) 255};
int actual = BitFiddler.GetByteAt(buff, 6, 6);
int expected = BitFiddler.UByte(48);
Th.Value(expected).ShouldEqual(actual);
}