/usr/share/gocode/src/github.com/tendermint/go-common/bit_array_test.go is in golang-github-tendermint-go-common-dev 0~20161202~0gitf40b1b6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"bytes"
"testing"
)
func randBitArray(bits int) (*BitArray, []byte) {
src := RandBytes((bits + 7) / 8)
bA := NewBitArray(bits)
for i := 0; i < len(src); i++ {
for j := 0; j < 8; j++ {
if i*8+j >= bits {
return bA, src
}
setBit := src[i]&(1<<uint(j)) > 0
bA.SetIndex(i*8+j, setBit)
}
}
return bA, src
}
func TestAnd(t *testing.T) {
bA1, _ := randBitArray(51)
bA2, _ := randBitArray(31)
bA3 := bA1.And(bA2)
if bA3.Bits != 31 {
t.Error("Expected min bits", bA3.Bits)
}
if len(bA3.Elems) != len(bA2.Elems) {
t.Error("Expected min elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i) && bA2.GetIndex(i)
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
}
}
}
func TestOr(t *testing.T) {
bA1, _ := randBitArray(51)
bA2, _ := randBitArray(31)
bA3 := bA1.Or(bA2)
if bA3.Bits != 51 {
t.Error("Expected max bits")
}
if len(bA3.Elems) != len(bA1.Elems) {
t.Error("Expected max elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i) || bA2.GetIndex(i)
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
}
}
}
func TestSub1(t *testing.T) {
bA1, _ := randBitArray(31)
bA2, _ := randBitArray(51)
bA3 := bA1.Sub(bA2)
if bA3.Bits != bA1.Bits {
t.Error("Expected bA1 bits")
}
if len(bA3.Elems) != len(bA1.Elems) {
t.Error("Expected bA1 elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i)
if bA2.GetIndex(i) {
expected = false
}
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
}
}
}
func TestSub2(t *testing.T) {
bA1, _ := randBitArray(51)
bA2, _ := randBitArray(31)
bA3 := bA1.Sub(bA2)
if bA3.Bits != bA1.Bits {
t.Error("Expected bA1 bits")
}
if len(bA3.Elems) != len(bA1.Elems) {
t.Error("Expected bA1 elems length")
}
for i := 0; i < bA3.Bits; i++ {
expected := bA1.GetIndex(i)
if i < bA2.Bits && bA2.GetIndex(i) {
expected = false
}
if bA3.GetIndex(i) != expected {
t.Error("Wrong bit from bA3")
}
}
}
func TestPickRandom(t *testing.T) {
for idx := 0; idx < 123; idx++ {
bA1 := NewBitArray(123)
bA1.SetIndex(idx, true)
index, ok := bA1.PickRandom()
if !ok {
t.Fatal("Expected to pick element but got none")
}
if index != idx {
t.Fatalf("Expected to pick element at %v but got wrong index", idx)
}
}
}
func TestBytes(t *testing.T) {
bA := NewBitArray(4)
bA.SetIndex(0, true)
check := func(bA *BitArray, bz []byte) {
if !bytes.Equal(bA.Bytes(), bz) {
panic(Fmt("Expected %X but got %X", bz, bA.Bytes()))
}
}
check(bA, []byte{0x01})
bA.SetIndex(3, true)
check(bA, []byte{0x09})
bA = NewBitArray(9)
check(bA, []byte{0x00, 0x00})
bA.SetIndex(7, true)
check(bA, []byte{0x80, 0x00})
bA.SetIndex(8, true)
check(bA, []byte{0x80, 0x01})
bA = NewBitArray(16)
check(bA, []byte{0x00, 0x00})
bA.SetIndex(7, true)
check(bA, []byte{0x80, 0x00})
bA.SetIndex(8, true)
check(bA, []byte{0x80, 0x01})
bA.SetIndex(9, true)
check(bA, []byte{0x80, 0x03})
}
func TestEmptyFull(t *testing.T) {
ns := []int{47, 123}
for _, n := range ns {
bA := NewBitArray(n)
if !bA.IsEmpty() {
t.Fatal("Expected bit array to be empty")
}
for i := 0; i < n; i++ {
bA.SetIndex(i, true)
}
if !bA.IsFull() {
t.Fatal("Expected bit array to be full")
}
}
}
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