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package test
import (
"bytes"
"errors"
"fmt"
"math"
"reflect"
"runtime"
"strings"
"testing"
"unicode"
)
// ErrPlain is the default error that is returned for functions in this package.
var ErrPlain = errors.New("error")
// Epsilon is used for floating point comparison.
var Epsilon = 1e-10
////////////////////////////////////////////////////////////////
func fileline(i int) string {
_, file, line, ok := runtime.Caller(i)
if !ok {
return ""
}
parts := strings.Split(file, "/")
file = parts[len(parts)-1]
return fmt.Sprintf("%s:%d", file, line)
}
func trace() string {
trace2 := fileline(2)
trace3 := fileline(3)
return "\r " + strings.Repeat(" ", len(fmt.Sprintf("%s:", trace2))) + "\r " + trace3
}
func message(msgs ...any) string {
if len(msgs) == 0 {
return ""
}
s := fmt.Sprintln(msgs...)
s = s[:len(s)-1] // remove newline
return ": " + s
}
func printable(s string) string {
s2 := ""
for _, r := range s {
if !unicode.IsPrint(r) {
if r == '\n' {
s2 += fmt.Sprintf(Dark + "\\n" + UndoDark)
} else if r == '\r' {
s2 += fmt.Sprintf(Dark + "\\r" + UndoDark)
} else if r == '\t' {
s2 += fmt.Sprintf(Dark + "\\t" + UndoDark)
} else if r == 0 {
s2 += fmt.Sprintf(Dark + "\\0" + UndoDark)
} else if r <= 0xFF {
s2 += fmt.Sprintf(Dark+"\\x%02X"+UndoDark, r)
} else if r <= 0xFFFF {
s2 += fmt.Sprintf(Dark+"\\u%04X"+UndoDark, r)
} else {
s2 += fmt.Sprintf(Dark+"\\U%08X"+UndoDark, r)
}
} else {
s2 += string(r)
}
}
return s2
}
const (
Red = "\x1B[31m"
Green = "\x1B[32m"
Dark = "\x1B[2m"
UndoDark = "\x1B[22m"
Reset = "\x1B[0m"
)
func color(color string, s any) string {
return fmt.Sprintf("%s%v%s", color, s, Reset)
}
func floatEqual(a, b, epsilon float64) bool {
// use mix of relative and absolute difference for large and small numbers respectively
// see: https://stackoverflow.com/a/32334103
if a == b {
return true
}
diff := math.Abs(a - b)
norm := math.Min(math.Abs(a)+math.Abs(b), math.MaxFloat64)
return diff < epsilon*math.Max(1.0, norm)
}
/////////////////////////////////////////////////////////////////
func Fail(t *testing.T, msgs ...any) {
t.Helper()
t.Fatalf("%s%s", trace(), message(msgs...))
}
func Error(t *testing.T, err error, msgs ...any) {
t.Helper()
if err != nil {
t.Fatalf("%s%s: %s", trace(), message(msgs...), color(Red, err.Error()))
}
}
func That(t *testing.T, condition bool, msgs ...any) {
t.Helper()
if !condition {
t.Fatalf("%s%s: false", trace(), message(msgs...))
}
}
func equalsInterface(got, wanted reflect.Value) (bool, bool) {
if equals, ok := wanted.Type().MethodByName("Equals"); ok && equals.Type.NumIn() == 2 && equals.Type.NumOut() == 1 && equals.Type.In(0) == wanted.Type() && equals.Type.In(1) == got.Type() && equals.Type.Out(0).Kind() == reflect.Bool {
return equals.Func.Call([]reflect.Value{wanted, got})[0].Bool(), true
}
return false, false
}
func T(t *testing.T, got, wanted any, msgs ...any) {
t.Helper()
gotType := reflect.TypeOf(got)
wantedType := reflect.TypeOf(wanted)
if gotType != wantedType {
t.Fatalf("%s%s: type %v != %v", trace(), message(msgs...), color(Red, gotType), color(Green, wantedType))
return
}
if reflect.DeepEqual(got, wanted) {
return
}
if wantedType != nil {
gotValue := reflect.ValueOf(got)
wantedValue := reflect.ValueOf(wanted)
if equals, ok := equalsInterface(gotValue, wantedValue); ok && equals {
return
} else if wantedValue.Kind() == reflect.Slice {
if gotValue.Len() == wantedValue.Len() {
i := 0
for ; i < wantedValue.Len(); i++ {
if equals, ok := equalsInterface(gotValue.Index(i), wantedValue.Index(i)); !ok {
break
} else if !equals {
break
}
}
if i == wantedValue.Len() {
return
}
}
}
}
t.Fatalf("%s%s: %v != %v", trace(), message(msgs...), color(Red, got), color(Green, wanted))
}
func Bytes(t *testing.T, got, wanted []byte, msgs ...any) {
t.Helper()
if !bytes.Equal(got, wanted) {
gotString := printable(string(got))
wantedString := printable(string(wanted))
t.Fatalf("%s%s:\n%s\n%s", trace(), message(msgs...), color(Red, gotString), color(Green, wantedString))
}
}
func String(t *testing.T, got, wanted string, msgs ...any) {
t.Helper()
if got != wanted {
gotString := printable(got)
wantedString := printable(wanted)
t.Fatalf("%s%s:\n%s\n%s", trace(), message(msgs...), color(Red, gotString), color(Green, wantedString))
}
}
func Float(t *testing.T, got, wanted float64, msgs ...any) {
t.Helper()
if math.IsNaN(wanted) != math.IsNaN(got) || !math.IsNaN(wanted) && !floatEqual(got, wanted, Epsilon) {
t.Fatalf("%s%s: %v != %v", trace(), message(msgs...), color(Red, got), color(Green, wanted))
}
}
func Floats(t *testing.T, got, wanted []float64, msgs ...any) {
t.Helper()
equal := len(got) == len(wanted)
if equal {
for i := range got {
if math.IsNaN(wanted[i]) != math.IsNaN(got[i]) || !math.IsNaN(wanted[i]) && !floatEqual(got[i], wanted[i], Epsilon) {
equal = false
break
}
}
}
if !equal {
t.Fatalf("%s%s: %v != %v", trace(), message(msgs...), color(Red, got), color(Green, wanted))
}
}
func FloatDiff(t *testing.T, got, wanted, epsilon float64, msgs ...any) {
t.Helper()
if math.IsNaN(wanted) != math.IsNaN(got) || !math.IsNaN(wanted) && !floatEqual(got, wanted, epsilon) {
t.Fatalf("%s%s: %v != %v", trace(), message(msgs...), color(Red, got), color(Green, fmt.Sprintf("%v ± %v", wanted, epsilon)))
}
}
func Minify(t *testing.T, input string, err error, got, wanted string, msgs ...any) {
t.Helper()
inputString := printable(input)
if err != nil {
t.Fatalf("%s%s:\n%s\n%s", trace(), message(msgs...), inputString, color(Red, err.Error()))
return
}
if got != wanted {
gotString := printable(got)
wantedString := printable(wanted)
t.Fatalf("%s%s:\n%s\n%s\n%s", trace(), message(msgs...), inputString, color(Red, gotString), color(Green, wantedString))
}
}
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