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lexnum_test.go
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lexnum_test.go
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package lexnum
import (
"math/rand"
"sort"
"testing"
"time"
)
var lexNumTests = []struct {
in int
out string
}{
{0, "0"},
{1, "=1"},
{9, "=9"},
{10, "==210"},
{99, "==299"},
{100, "==3100"},
{12345, "==512345"},
{123456789, "==9123456789"},
{1234567890, "===2101234567890"},
{-1, "-8"},
{-2, "-7"},
{-9, "-0"},
{-10, "--789"},
{-11, "--788"},
{-123, "--6876"},
{-123456789, "--0876543210"},
{-1234567890, "---7898765432109"},
}
func TestLexnum(t *testing.T) {
rand.Seed(time.Now().UnixNano())
e := NewEncoder('=', '-')
for _, test := range lexNumTests {
s := e.EncodeInt(test.in)
t.Logf("%d -> %s", test.in, test.out)
if s != test.out {
t.Errorf("encode input: %v, output: %v, expected output: %v", test.in, s, test.out)
}
n, err := e.DecodeInt(s)
if err != nil {
t.Errorf("decode error: %v", err)
continue
}
if n != test.in {
t.Errorf("decode input: %v, output: %v, expected output: %v", s, n, test.in)
}
}
// -150 to 150 test
nums, stringz := make([]int, 0, 301), make([]string, 0, 301)
for x := -150; x <= 150; x += 1 {
nums = append(nums, x)
stringz = append(stringz, e.EncodeInt(x))
}
sort.Strings(stringz)
sort.Ints(nums)
for i := 0; i < len(nums); i++ {
n, err := e.DecodeInt(stringz[i])
if err != nil {
t.Errorf("unable to decode our own input: %v", stringz[i])
continue
}
if n != nums[i] {
t.Errorf("sorting is broken in range test")
t.Log(stringz, "\n", nums)
break
}
}
// random test
runsize := 8
for runz := 0; runz < 4; runz += 1 {
nums, stringz := make([]int, runsize), make([]string, runsize)
for i := 0; i < runsize; i++ {
nums[i] = rand.Int()
if rand.Int()%2 == 0 {
nums[i] = -nums[i]
}
stringz[i] = e.EncodeInt(nums[i])
}
sort.Strings(stringz)
sort.Ints(nums)
t.Logf("stringz sorted: %v", stringz)
t.Logf("nums sorted: %v", nums)
for i := 0; i < runsize; i++ {
n, err := e.DecodeInt(stringz[i])
if err != nil {
t.Errorf("unable to decode our own input: %v", stringz[i])
continue
}
if n != nums[i] {
t.Errorf("sorting is broken")
}
}
}
}