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iterator_test.go
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iterator_test.go
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package uint256
import (
"fmt"
"testing"
"github.com/kg6zvp/go-intdian"
)
func TestGetStart(t *testing.T) {
if intdian.BigEndian() {
if getStart() != 0 {
t.Fatalf("Big endian iterators should start at 0, started at %d", getStart())
}
} else { // little endian
if getStart() != 3 {
t.Fatalf("Little endian iterators should start at 3, started at %d", getStart())
}
}
}
func TestCompare(t *testing.T) {
comp := getComp()
if intdian.Big_Endian {
if comp(LENGTH + 1) { // shouldn't allow larger numbers
t.Fail()
}
if !comp(-1) { //should allow low numbers
t.Fail()
}
} else { // little endian
if !comp(LENGTH + 1) { // should allow larger numbers
t.Fail()
}
if comp(-1) { //shouldn't allow low numbers
t.Fail()
}
}
}
func TestIterator(t *testing.T) {
it := getIt()
if intdian.Big_Endian {
if it(1) != 2 {
t.Fail()
}
} else { // little endian
if it(1) != 0 {
t.Fail()
}
}
}
func TestIteration(t *testing.T) {
start := getStart()
it := getIt()
comp := getComp()
if intdian.Big_Endian {
bigIteration(t, start, comp, it)
} else { // little endian
littleIteration(t, start, comp, it)
}
}
func bigIteration(t *testing.T, start int, comp cond, it iter) {
if start != 0 {
t.Fatalf("big endian should start at 0, started at %d", start)
}
ti := start
for i := 0; i < 4; i++ {
fmt.Printf("i = %d, ti = %d\n", i, ti)
if ti > 3 || ti < 0 {
t.Fatalf("ti should be between 0 and 3, inclusive, was %d", ti)
}
if !comp(ti) {
t.Fatalf("comparison failed at ti == %d", ti)
}
ti = it(ti)
}
if ti != 4 {
t.Fatalf("big endian should end at 4, ended at %d", ti)
}
}
func littleIteration(t *testing.T, start int, comp cond, it iter) {
if start != 3 {
t.Fatalf("little endian should start at 3, started at %d", start)
}
ti := start
for i := 3; i >= 0; i-- {
fmt.Printf("i = %d, ti = %d\n", i, ti)
if ti > 3 || ti < 0 {
t.Fatalf("ti should be between 3 and 0, inclusive, was %d", ti)
}
if !comp(ti) {
t.Fatalf("comparison failed at ti == %d", ti)
}
ti = it(ti)
}
if ti != -1 {
t.Fatalf("little endian should end at -1, ended at %d", ti)
}
}