/
proof.go
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/
proof.go
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package proof
import (
"fmt"
"reflect"
"runtime/debug"
"time"
"github.com/google/go-cmp/cmp"
)
type T interface {
Log(args ...interface{})
Error(args ...interface{})
FailNow()
Fatal(args ...interface{})
Fatalf(format string, args ...interface{})
Failed() bool
Helper()
}
type Prover struct {
T T
lax bool
}
func New(t T) *Prover {
return &Prover{T: t}
}
func (p *Prover) Equal(x, y interface{}) {
if !equal(x, y) {
s := failureStringWithDiff(p.T, "Objects should be equal", x, y)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) EqualsAny(x interface{}, y ...interface{}) {
var found bool
for i := range y {
if equal(x, y[i]) {
found = true
break
}
}
if !found {
s := failureStringWithDiff(p.T, "One of the list of objects should be equal to the first argument", x, y)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) NotEqual(x, y interface{}) {
if equal(x, y) {
s := failureStringWithValues(p.T, "Objects should not be equal", x, y)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) Err(err error) {
if isNil(err) {
s := failureStringWithValue(p.T, "Error should not be nil", err)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) NotErr(err error) {
if !isNil(err) {
s := failureStringWithValue(p.T, "Error should be nil", err)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) Nil(o interface{}) {
if !isNil(o) {
s := failureStringWithValue(p.T, "Object should be nil", o)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) NotNil(o interface{}) {
if isNil(o) {
s := failureStringWithValue(p.T, "Object should not be nil", o)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) True(b bool) {
if !b {
s := failureStringWithValue(p.T, "Bool should be true", b)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) False(b bool) {
if b {
s := failureStringWithValue(p.T, "Bool should not be true", b)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) Zero(o interface{}) {
if !isZero(o) {
s := failureStringWithValue(p.T, "Object should be zero value", o)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) NotZero(o interface{}) {
if isZero(o) {
s := failureStringWithValue(p.T, "Object should not be zero value", o)
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
}
func (p *Prover) ContainedBySlice(object interface{}, slice interface{}) {
sv := reflect.ValueOf(slice)
sk := sv.Kind()
if sk != reflect.Slice && sk != reflect.Array {
p.T.Fatalf("ContainedBySlice received non-slice argument")
}
for i := 0; i < sv.Len(); i++ {
if equal(sv.Index(i).Interface(), object) {
return
}
}
fs := failureStringWithValues(p.T, "Slice does not contain object", slice, object)
p.T.Helper()
if !p.lax {
p.T.Fatal(fs)
} else {
p.T.Error(fs)
}
}
func (p *Prover) Len(o interface{}, length int) {
oLen, hasLen := getLen(o)
if hasLen && oLen == length {
return
}
var s string
if !hasLen {
s = failureStringWithValue(p.T, "Object was not of type array, slice, map or chan", o)
} else {
s = fmt.Sprintf("Expected object of length %d to be length %d", oLen, length)
s = failureStringWithValue(p.T, s, o)
}
p.T.Helper()
if !p.lax {
p.T.Fatal(s)
} else {
p.T.Error(s)
}
}
func (p *Prover) Panic(f func()) {
defer func() {
r := recover()
if r == nil {
p.T.Helper()
if !p.lax {
p.T.Fatal("Expected function to panic")
} else {
p.T.Error("Expected function to panic")
}
}
}()
f()
}
func (p *Prover) Retry(duration time.Duration, f func() bool) {
after := time.After(duration)
for {
select {
case <-after:
p.T.Helper()
if !p.lax {
p.T.Fatalf("Expected function to return true within duration %v", duration)
} else {
p.T.Error("Expected function to panic")
}
return
default:
if f() {
return
}
time.Sleep(100 * time.Millisecond)
}
}
}
func (p *Prover) Lax(fn func(lax *Prover)) {
lax := &Prover{
T: p.T,
lax: true,
}
fn(lax)
if lax.T.Failed() {
p.T.FailNow()
}
}
func Recover(t T) {
if r := recover(); r != nil {
stack := debug.Stack()
if !t.Failed() {
t.Helper()
fmt.Printf(fmt.Sprintf("panic: %v [recovered]\n\n", r))
fmt.Println(string(stack))
t.FailNow()
}
}
}
func equal(x, y interface{}) bool {
allowAllUnexported := cmp.Exporter(func(reflect.Type) bool { return true })
return cmp.Equal(x, y, equateConvertibleTypes(), allowAllUnexported)
}
func getLen(o interface{}) (int, bool) {
v := reflect.ValueOf(o)
k := v.Type().Kind()
if o == nil ||
(k != reflect.Array &&
k != reflect.Slice &&
k != reflect.Map &&
k != reflect.Chan) {
return 0, false
}
return v.Len(), true
}
func isNil(o interface{}) bool {
if o == nil {
return true
}
return isNilValue(reflect.ValueOf(o))
}
func isNilValue(v reflect.Value) bool {
kind := v.Kind()
if kind >= reflect.Chan &&
kind <= reflect.Slice &&
v.IsNil() {
return true
}
return false
}
func isZero(o interface{}) bool {
if o == nil {
return true
}
v := reflect.ValueOf(o)
if isNilValue(v) {
return true
}
switch v.Kind() {
case reflect.Ptr:
return equal(o, zeroPtr(v))
case reflect.Slice, reflect.Array, reflect.Map:
if v.Len() == 0 {
return true
}
return false
default:
return equal(o, zeroVal(v))
}
}
func zeroPtr(v reflect.Value) interface{} {
return reflect.New(v.Type().Elem()).Interface()
}
func zeroVal(v reflect.Value) interface{} {
return reflect.Zero(v.Type()).Interface()
}
func failureStringWithValue(t T, msg string, o interface{}) string {
s := fmt.Sprintf("(%T) %s (%v)", o, msg, o)
return s
}
func failureStringWithValues(t T, msg string, x, y interface{}) string {
s := fmt.Sprintf("(%T, %T) %s (%v, %v)", x, y, msg, x, y)
return s
}
func failureStringWithDiff(t T, msg string, x, y interface{}) string {
ds := diff(x, y)
s := fmt.Sprintf("(%T, %T) %s", x, y, msg)
if ds != "" {
s += ":\n" + ds
}
return s
}
func diff(x, y interface{}) string {
return cmp.Diff(x, y)
}
func equateConvertibleTypes() cmp.Option {
return cmp.FilterValues(shouldTreatAsConvertibleTypes, cmp.Comparer(equateAfterConverting))
}
func shouldTreatAsConvertibleTypes(x, y interface{}) bool {
if x == nil || y == nil {
return false
}
xt := reflect.TypeOf(x)
yt := reflect.TypeOf(y)
if xt.Name() == yt.Name() {
return false
}
if !xt.ConvertibleTo(yt) || !yt.ConvertibleTo(xt) {
return false
}
return true
}
func equateAfterConverting(x, y interface{}) bool {
xv := reflect.ValueOf(x)
yv := reflect.ValueOf(y)
return cmp.Equal(xv.Convert(yv.Type()).Interface(), y)
}