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120 lines
2.5 KiB
120 lines
2.5 KiB
package common
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import (
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"testing"
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)
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func randBitArray(bits uint) (BitArray, []byte) {
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src := RandBytes(int((bits + 7) / 8))
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bA := NewBitArray(bits)
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for i := uint(0); i < uint(len(src)); i++ {
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for j := uint(0); j < 8; j++ {
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if i*8+j >= bits {
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return bA, src
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}
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setBit := src[i]&(1<<j) > 0
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bA.SetIndex(i*8+j, setBit)
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}
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}
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return bA, src
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}
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func TestAnd(t *testing.T) {
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bA1, _ := randBitArray(51)
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bA2, _ := randBitArray(31)
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bA3 := bA1.And(bA2)
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if bA3.Bits != 31 {
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t.Error("Expected min bits", bA3.Bits)
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}
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if len(bA3.Elems) != len(bA2.Elems) {
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t.Error("Expected min elems length")
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}
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for i := uint(0); i < bA3.Bits; i++ {
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expected := bA1.GetIndex(i) && bA2.GetIndex(i)
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if bA3.GetIndex(i) != expected {
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t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
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}
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}
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}
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func TestOr(t *testing.T) {
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bA1, _ := randBitArray(51)
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bA2, _ := randBitArray(31)
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bA3 := bA1.Or(bA2)
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if bA3.Bits != 51 {
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t.Error("Expected max bits")
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}
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if len(bA3.Elems) != len(bA1.Elems) {
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t.Error("Expected max elems length")
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}
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for i := uint(0); i < bA3.Bits; i++ {
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expected := bA1.GetIndex(i) || bA2.GetIndex(i)
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if bA3.GetIndex(i) != expected {
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t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
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}
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}
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}
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func TestSub1(t *testing.T) {
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bA1, _ := randBitArray(31)
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bA2, _ := randBitArray(51)
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bA3 := bA1.Sub(bA2)
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if bA3.Bits != bA1.Bits {
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t.Error("Expected bA1 bits")
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}
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if len(bA3.Elems) != len(bA1.Elems) {
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t.Error("Expected bA1 elems length")
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}
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for i := uint(0); i < bA3.Bits; i++ {
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expected := bA1.GetIndex(i)
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if bA2.GetIndex(i) {
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expected = false
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}
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if bA3.GetIndex(i) != expected {
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t.Error("Wrong bit from bA3", i, bA1.GetIndex(i), bA2.GetIndex(i), bA3.GetIndex(i))
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}
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}
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}
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func TestSub2(t *testing.T) {
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bA1, _ := randBitArray(51)
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bA2, _ := randBitArray(31)
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bA3 := bA1.Sub(bA2)
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if bA3.Bits != bA1.Bits {
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t.Error("Expected bA1 bits")
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}
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if len(bA3.Elems) != len(bA1.Elems) {
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t.Error("Expected bA1 elems length")
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}
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for i := uint(0); i < bA3.Bits; i++ {
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expected := bA1.GetIndex(i)
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if i < bA2.Bits && bA2.GetIndex(i) {
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expected = false
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}
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if bA3.GetIndex(i) != expected {
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t.Error("Wrong bit from bA3")
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}
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}
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}
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func TestPickRandom(t *testing.T) {
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for idx := 0; idx < 123; idx++ {
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bA1 := NewBitArray(123)
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bA1.SetIndex(uint(idx), true)
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index, ok := bA1.PickRandom()
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if !ok {
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t.Fatal("Expected to pick element but got none")
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}
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if index != uint(idx) {
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t.Fatalf("Expected to pick element at %v but got wrong index", idx)
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}
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}
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}
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