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v/vlib/bitfield/bitfield_test.v

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import bitfield
import rand
import time
fn test_bf_new_size() {
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instance := bitfield.new(75)
assert instance.get_size() == 75
}
fn test_bf_set_clear_toggle_get() {
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mut instance := bitfield.new(75)
instance.set_bit(47)
assert instance.get_bit(47) == 1
instance.clear_bit(47)
assert instance.get_bit(47) == 0
instance.toggle_bit(47)
assert instance.get_bit(47) == 1
}
fn test_bf_and_not_or_xor() {
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rand.seed(time.now().unix)
len := 80
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mut input1 := bitfield.new(len)
mut input2 := bitfield.new(len)
mut i := 0
for i < len {
if rand.next(2) == 1 {
input1.set_bit(i)
}
if rand.next(2) == 1{
input2.set_bit(i)
}
i++
}
output1 := bitfield.bf_xor(input1, input2)
bf_and := bitfield.bf_and(input1, input2)
bf_or := bitfield.bf_or(input1, input2)
bf_not := bitfield.bf_not(bf_and)
output2 := bitfield.bf_and(bf_or, bf_not)
mut result := 1
for i < len {
if output1.get_bit(i) != output2.get_bit(i) {result = 0}
}
assert result == 1
}
fn test_clone_cmp() {
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rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 1 {
input.set_bit(i)
}
}
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output := input.clone()
assert output.get_size() == len
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assert input.cmp(output) == true
}
fn test_slice_join() {
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rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 1 {
input.set_bit(i)
}
}
mut result := 1
for point := 1; point < (len - 1); point++ {
// divide a bitfield into two subfields
chunk1 := input.slice(0, point)
chunk2 := input.slice(point, input.get_size())
// concatenate them back into one and compare to the original
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output := bitfield.join(chunk1, chunk2)
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if !input.cmp(output) {
result = 0
}
}
assert result == 1
}
fn test_pop_count() {
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rand.seed(time.now().unix)
len := 80
mut count0 := 0
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mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 1 {
input.set_bit(i)
count0++
}
}
count1 := input.pop_count()
assert count0 == count1
}
fn test_hamming() {
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rand.seed(time.now().unix)
len := 80
mut count := 0
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mut input1 := bitfield.new(len)
mut input2 := bitfield.new(len)
for i in 0..len {
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match rand.next(4) {
0, 1 {
input1.set_bit(i)
count++
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}
2 {
input2.set_bit(i)
count++
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}
3 {
input1.set_bit(i)
input2.set_bit(i)
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}
else {
}
}
}
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assert count == bitfield.hamming(input1, input2)
}
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fn test_bf_from_bytes() {
input := [byte(0xF0), byte(0x0F), byte(0xF0), byte(0xFF)]
output := bitfield.from_bytes(input)
mut result := 1
for i in 0..input.len * 8 {
if (input[i / 8] >> (i % 8)) & 1 != output.get_bit(i) {
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result = 0
}
}
assert result == 1
}
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fn test_bf_from_str() {
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rand.seed(time.now().unix)
len := 80
mut input := ''
for _ in 0..len {
if rand.next(2) == 1 {
input = input + '1'
}
else {
input = input + '0'
}
}
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output := bitfield.from_str(input)
mut result := 1
for i in 0..len {
if input[i] != output.get_bit(i) + 48 {
result = 0
}
}
assert result == 1
}
fn test_bf_bf2str() {
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rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 1 {
input.set_bit(i)
}
}
mut check := ''
for i in 0..len {
if input.get_bit(i) == 1 {
check = check + '1'
}
else {
check = check + '0'
}
}
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output := input.str()
mut result := 1
for i in 0..len {
if check[i] != output[i] {
result = 0
}
}
assert result == 1
}
fn test_bf_set_all() {
rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(len)
input.set_all()
mut result := 1
for i in 0..len {
if input.get_bit(i) != 1 {
result = 0
}
}
assert result == 1
}
fn test_bf_clear_all() {
rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 1 {
input.set_bit(i)
}
}
input.clear_all()
mut result := 1
for i in 0..len {
if input.get_bit(i) != 0 {
result = 0
}
}
assert result == 1
}
fn test_bf_reverse() {
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rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 1 {
input.set_bit(i)
}
}
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check := input.clone()
output := input.reverse()
mut result := 1
for i in 0..len {
if output.get_bit(i) != check.get_bit(len - i - 1) {
result = 0
}
}
assert result == 1
}
fn test_bf_resize() {
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rand.seed(time.now().unix)
len := 80
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mut input := bitfield.new(rand.next(len) + 1)
for _ in 0..100 {
input.resize(rand.next(len) + 1)
input.set_bit(input.get_size() - 1)
}
assert input.get_bit(input.get_size() - 1) == 1
}
fn test_bf_pos() {
/**
* set haystack size to 80
* test different sizes of needle, from 1 to 80
* test different positions of needle, from 0 to where it fits
* all haystacks here contain exactly one instanse of needle,
* so search should return non-negative-values
**/
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rand.seed(time.now().unix)
len := 80
mut result := 1
for i := 1; i < len; i++ { // needle size
for j in 0..len - i { // needle position in the haystack
// create the needle
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mut needle := bitfield.new(i)
// fill the needle with random values
for k in 0..i {
if rand.next(2) == 1 {
needle.set_bit(k)
}
}
// make sure the needle contains at least one set bit, selected randomly
r := rand.next(i)
needle.set_bit(r)
// create the haystack, make sure it contains the needle
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mut haystack := needle.clone()
// if there is space between the start of the haystack and the sought needle, fill it with zeroes
if j > 0 {
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start := bitfield.new(j)
tmp := bitfield.join(start, haystack)
haystack = tmp
}
// if there is space between the sought needle and the end of haystack, fill it with zeroes
if j + i < len {
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end := bitfield.new(len - j - i)
tmp2 := bitfield.join(haystack, end)
haystack = tmp2
}
// now let's test
// the result should be equal to j
if haystack.pos(needle) != j {
result = 0
}
}
}
assert result == 1
}
fn test_bf_rotate() {
mut result := 1
len := 80
for i := 1; i < 80 && result == 1; i++ {
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mut chunk1 := bitfield.new(i)
chunk2 := bitfield.new(len - i)
chunk1.set_all()
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input := bitfield.join(chunk1, chunk2)
output := input.rotate(i)
if output.get_bit(len - i - 1) != 0 || output.get_bit(len - i) != 1 {
result = 0
}
}
assert result == 1
}
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fn test_bf_printing(){
rand.seed(time.now().unix)
len := 80
mut input := bitfield.new(len)
for i in 0..len {
if rand.next(2) == 0 {
input.set_bit(i)
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}
}
// the following should convert the bitfield input into a string automatically
println(input)
assert true
}