How to use getCaster method of td Package

Best Go-testdeep code snippet using td.getCaster

td_smuggle.go

Source:td_smuggle.go Github

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...255 vfn := reflect.ValueOf(fn)256 smuggleFns[fieldPath] = vfn257 return vfn, err258}259func getCaster(outType reflect.Type) reflect.Value {260 smuggleFnsMu.Lock()261 defer smuggleFnsMu.Unlock()262 if vfn, ok := smuggleFns[outType]; ok {263 return vfn264 }265 var fn reflect.Value266 switch outType.Kind() {267 case reflect.String:268 fn = buildCaster(outType, true)269 case reflect.Slice:270 if outType.Elem().Kind() == reflect.Uint8 {271 // Special case for slices of bytes: falls back on io.Reader if not []byte272 fn = buildCaster(outType, false)273 break274 }275 fallthrough276 default:277 // For all other types, take the received param and return278 // it. Smuggle already converted got to the type of param, so the279 // work is done.280 inOut := []reflect.Type{outType}281 fn = reflect.MakeFunc(282 reflect.FuncOf(inOut, inOut, false),283 func(args []reflect.Value) []reflect.Value { return args },284 )285 }286 smuggleFns[outType] = fn287 return fn288}289// buildCaster returns a function:290//291// func(in any) (out outType, err error)292//293// dynamically checks…294// - if useString is false, as outType is a slice of bytes:295// 1. in is a []byte or convertible to []byte296// 2. in implements io.Reader297// - if useString is true, as outType is a string:298// 1. in is a []byte or convertible to string299// 2. in implements io.Reader300func buildCaster(outType reflect.Type, useString bool) reflect.Value {301 zeroRet := reflect.New(outType).Elem()302 return reflect.MakeFunc(303 reflect.FuncOf(304 []reflect.Type{types.Interface},305 []reflect.Type{outType, types.Error},306 false,307 ),308 func(args []reflect.Value) []reflect.Value {309 if args[0].IsNil() {310 return []reflect.Value{311 zeroRet,312 reflect.ValueOf(&ctxerr.Error{313 Message: "incompatible parameter type",314 Got: types.RawString("nil"),315 Expected: types.RawString(outType.String() + " or convertible or io.Reader"),316 }),317 }318 }319 // 1st & only arg is always an interface320 args[0] = args[0].Elem()321 if ok, convertible := types.IsTypeOrConvertible(args[0], outType); ok {322 if convertible {323 return []reflect.Value{args[0].Convert(outType), nilError}324 }325 return []reflect.Value{args[0], nilError}326 }327 // Our caller encures Interface() can be called safely328 switch ta := args[0].Interface().(type) {329 case io.Reader:330 var b bytes.Buffer331 if _, err := b.ReadFrom(ta); err != nil {332 return []reflect.Value{333 zeroRet,334 reflect.ValueOf(&ctxerr.Error{335 Message: "an error occurred while reading from io.Reader",336 Summary: ctxerr.NewSummary(err.Error()),337 }),338 }339 }340 var buf any341 if useString {342 buf = b.String()343 } else {344 buf = b.Bytes()345 }346 return []reflect.Value{347 reflect.ValueOf(buf).Convert(outType),348 nilError,349 }350 default:351 return []reflect.Value{352 zeroRet,353 reflect.ValueOf(&ctxerr.Error{354 Message: "incompatible parameter type",355 Got: types.RawString(args[0].Type().String()),356 Expected: types.RawString(outType.String() + " or convertible or io.Reader"),357 }),358 }359 }360 })361}362// summary(Smuggle): changes data contents or mutates it into another363// type via a custom function or a struct fields-path before stepping364// down in favor of generic comparison process365// input(Smuggle): all366// Smuggle operator allows to change data contents or mutate it into367// another type before stepping down in favor of generic comparison368// process. Of course it is a smuggler operator. So fn is a function369// that must take one parameter whose type must be convertible to the370// type of the compared value.371//372// As convenient shortcuts, fn can be a string specifying a373// fields-path through structs, maps & slices, or any other type, in374// this case a simple cast is done (see below for details).375//376// fn must return at least one value. These value will be compared as is377// to expectedValue, here integer 28:378//379// td.Cmp(t, "0028",380// td.Smuggle(func(value string) int {381// num, _ := strconv.Atoi(value)382// return num383// }, 28),384// )385//386// or using an other [TestDeep] operator, here [Between](28, 30):387//388// td.Cmp(t, "0029",389// td.Smuggle(func(value string) int {390// num, _ := strconv.Atoi(value)391// return num392// }, td.Between(28, 30)),393// )394//395// fn can return a second boolean value, used to tell that a problem396// occurred and so stop the comparison:397//398// td.Cmp(t, "0029",399// td.Smuggle(func(value string) (int, bool) {400// num, err := strconv.Atoi(value)401// return num, err == nil402// }, td.Between(28, 30)),403// )404//405// fn can return a third string value which is used to describe the406// test when a problem occurred (false second boolean value):407//408// td.Cmp(t, "0029",409// td.Smuggle(func(value string) (int, bool, string) {410// num, err := strconv.Atoi(value)411// if err != nil {412// return 0, false, "string must contain a number"413// }414// return num, true, ""415// }, td.Between(28, 30)),416// )417//418// Instead of returning (X, bool) or (X, bool, string), fn can419// return (X, error). When a problem occurs, the returned error is420// non-nil, as in:421//422// td.Cmp(t, "0029",423// td.Smuggle(func(value string) (int, error) {424// num, err := strconv.Atoi(value)425// return num, err426// }, td.Between(28, 30)),427// )428//429// Which can be simplified to:430//431// td.Cmp(t, "0029", td.Smuggle(strconv.Atoi, td.Between(28, 30)))432//433// Imagine you want to compare that the Year of a date is between 2010434// and 2020:435//436// td.Cmp(t, time.Date(2015, time.May, 1, 1, 2, 3, 0, time.UTC),437// td.Smuggle(func(date time.Time) int { return date.Year() },438// td.Between(2010, 2020)),439// )440//441// In this case the data location forwarded to next test will be442// something like "DATA.MyTimeField<smuggled>", but you can act on it443// too by returning a [SmuggledGot] struct (by value or by address):444//445// td.Cmp(t, time.Date(2015, time.May, 1, 1, 2, 3, 0, time.UTC),446// td.Smuggle(func(date time.Time) SmuggledGot {447// return SmuggledGot{448// Name: "Year",449// Got: date.Year(),450// }451// }, td.Between(2010, 2020)),452// )453//454// then the data location forwarded to next test will be something like455// "DATA.MyTimeField.Year". The "." between the current path (here456// "DATA.MyTimeField") and the returned Name "Year" is automatically457// added when Name starts with a Letter.458//459// Note that [SmuggledGot] and [*SmuggledGot] returns are treated460// equally, and they are only used when fn has only one returned value461// or when the second boolean returned value is true.462//463// Of course, all cases can go together:464//465// // Accepts a "YYYY/mm/DD HH:MM:SS" string to produce a time.Time and tests466// // whether this date is contained between 2 hours before now and now.467// td.Cmp(t, "2020-01-25 12:13:14",468// td.Smuggle(func(date string) (*SmuggledGot, bool, string) {469// date, err := time.Parse("2006/01/02 15:04:05", date)470// if err != nil {471// return nil, false, `date must conform to "YYYY/mm/DD HH:MM:SS" format`472// }473// return &SmuggledGot{474// Name: "Date",475// Got: date,476// }, true, ""477// }, td.Between(time.Now().Add(-2*time.Hour), time.Now())),478// )479//480// or:481//482// // Accepts a "YYYY/mm/DD HH:MM:SS" string to produce a time.Time and tests483// // whether this date is contained between 2 hours before now and now.484// td.Cmp(t, "2020-01-25 12:13:14",485// td.Smuggle(func(date string) (*SmuggledGot, error) {486// date, err := time.Parse("2006/01/02 15:04:05", date)487// if err != nil {488// return nil, err489// }490// return &SmuggledGot{491// Name: "Date",492// Got: date,493// }, nil494// }, td.Between(time.Now().Add(-2*time.Hour), time.Now())),495// )496//497// Smuggle can also be used to access a struct field embedded in498// several struct layers.499//500// type A struct{ Num int }501// type B struct{ As map[string]*A }502// type C struct{ B B }503// got := C{B: B{As: map[string]*A{"foo": {Num: 12}}}}504//505// // Tests that got.B.A.Num is 12506// td.Cmp(t, got,507// td.Smuggle(func(c C) int {508// return c.B.As["foo"].Num509// }, 12))510//511// As brought up above, a fields-path can be passed as fn value512// instead of a function pointer. Using this feature, the [Cmp]513// call in the above example can be rewritten as follows:514//515// // Tests that got.B.As["foo"].Num is 12516// td.Cmp(t, got, td.Smuggle("B.As[foo].Num", 12))517//518// Contrary to [JSONPointer] operator, private fields can be519// followed. Arrays, slices and maps work using the index/key inside520// square brackets (e.g. [12] or [foo]). Maps work only for simple key521// types (string or numbers), without "" when using strings522// (e.g. [foo]).523//524// Behind the scenes, a temporary function is automatically created to525// achieve the same goal, but add some checks against nil values and526// auto-dereference interfaces and pointers, even on several levels,527// like in:528//529// type A struct{ N any }530// num := 12531// pnum := &num532// td.Cmp(t, A{N: &pnum}, td.Smuggle("N", 12))533//534// Last but not least, a simple type can be passed as fn to operate535// a cast, handling specifically strings and slices of bytes:536//537// td.Cmp(t, `{"foo":1}`, td.Smuggle(json.RawMessage{}, td.JSON(`{"foo":1}`)))538// // or equally539// td.Cmp(t, `{"foo":1}`, td.Smuggle(json.RawMessage(nil), td.JSON(`{"foo":1}`)))540//541// converts on the fly a string to a [json.RawMessage] so [JSON] operator542// can parse it as JSON. This is mostly a shortcut for:543//544// td.Cmp(t, `{"foo":1}`, td.Smuggle(545// func(r json.RawMessage) json.RawMessage { return r },546// td.JSON(`{"foo":1}`)))547//548// except that for strings and slices of bytes (like here), it accepts549// [io.Reader] interface too:550//551// var body io.Reader552// // …553// td.Cmp(t, body, td.Smuggle(json.RawMessage{}, td.JSON(`{"foo":1}`)))554// // or equally555// td.Cmp(t, body, td.Smuggle(json.RawMessage(nil), td.JSON(`{"foo":1}`)))556//557// This last example allows to easily inject body content into JSON558// operator.559//560// The difference between Smuggle and [Code] operators is that [Code]561// is used to do a final comparison while Smuggle transforms the data562// and then steps down in favor of generic comparison563// process. Moreover, the type accepted as input for the function is564// more lax to facilitate the writing of tests (e.g. the function can565// accept a float64 and the got value be an int). See examples. On the566// other hand, the output type is strict and must match exactly the567// expected value type. The fields-path string fn shortcut and the568// cast feature are not available with [Code] operator.569//570// TypeBehind method returns the [reflect.Type] of only parameter of571// fn. For the case where fn is a fields-path, it is always572// any, as the type can not be known in advance.573//574// See also [Code] and [JSONPointer].575//576// [json.RawMessage]: https://pkg.go.dev/encoding/json#RawMessage577func Smuggle(fn, expectedValue any) TestDeep {578 s := tdSmuggle{579 tdSmugglerBase: newSmugglerBase(expectedValue),580 }581 const usage = "(FUNC|FIELDS_PATH|ANY_TYPE, TESTDEEP_OPERATOR|EXPECTED_VALUE)"582 const fullUsage = "Smuggle" + usage583 var vfn reflect.Value584 switch rfn := fn.(type) {585 case reflect.Type:586 switch rfn.Kind() {587 case reflect.Func, reflect.Invalid, reflect.Interface:588 s.err = ctxerr.OpBad("Smuggle",589 "usage: Smuggle%s, ANY_TYPE reflect.Type cannot be Func nor Interface", usage)590 return &s591 default:592 vfn = getCaster(rfn)593 }594 case string:595 if rfn == "" {596 vfn = getCaster(reflect.TypeOf(fn))597 break598 }599 var err error600 vfn, err = getFieldsPathFn(rfn)601 if err != nil {602 s.err = ctxerr.OpBad("Smuggle", "Smuggle%s: %s", usage, err)603 return &s604 }605 default:606 vfn = reflect.ValueOf(fn)607 switch vfn.Kind() {608 case reflect.Func:609 // nothing to check610 case reflect.Invalid, reflect.Interface:611 s.err = ctxerr.OpBad("Smuggle",612 "usage: Smuggle%s, ANY_TYPE cannot be nil nor Interface", usage)613 return &s614 default:615 vfn = getCaster(vfn.Type())616 }617 }618 fnType := vfn.Type()619 if fnType.IsVariadic() || fnType.NumIn() != 1 {620 s.err = ctxerr.OpBad("Smuggle", fullUsage+": FUNC must take only one non-variadic argument")621 return &s622 }623 switch fnType.NumOut() {624 case 3: // (value, bool, string)625 if fnType.Out(2).Kind() != reflect.String {626 break627 }628 fallthrough629 case 2:...

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getCaster

Using AI Code Generation

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1import "fmt"2func main() {3 fmt.Println(td.getCaster())4}5import "fmt"6func main() {7 fmt.Println(td.getTarget())8}9import "fmt"10func main() {11 fmt.Println(td.getSpell())12}13import "fmt"14func main() {15 fmt.Println(td.getDamage())16}17import "fmt"18func main() {19 fmt.Println(td.getDamageType())20}21import "fmt"22func main() {23 fmt.Println(td.getHitType())24}25import "fmt"26func main() {27 fmt.Println(td.getHitLocation())28}29import "fmt"30func main() {31 fmt.Println(td.getHitDamage())32}33import "fmt"34func main() {35 fmt.Println(td.getHitDamageType())36}37import "fmt"38func main() {39 fmt.Println(td.getHitDamageLocation())40}41import "fmt"42func main() {43 fmt.Println(td.getHitDamageLocation())44}45import "fmt"46func main() {47 fmt.Println(td.getHitDamageLocation())48}49import "fmt"50func main() {51 fmt.Println(td.getHitDamageLocation())52}

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getCaster

Using AI Code Generation

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1import (2type td struct {3}4func (t *td) getCaster() string {5}6func main() {7 t := td{}8 fmt.Println(t.getCaster())9}10import (11type td struct {12}13func (t *td) getCaster() string {14}15func main() {16 t := &td{}17 fmt.Println(t.getCaster())18}19import (20type td struct {21}22func (t td) getCaster() string {23}24func main() {25 t := &td{}26 fmt.Println(t.getCaster())27}28import (29type td struct {30}31func (t *td) getCaster() string {32}33func main() {34 t := &td{}35 fmt.Println(t.getCaster())36}

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getCaster

Using AI Code Generation

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1import "fmt"2func main() {3 t.setCaster("James")4 fmt.Println(t.getCaster())5}6import "fmt"7func main() {8 t.setCaster("James")9 fmt.Println(t.getCaster())10}11import "fmt"12func main() {13 t.setCaster("James")14 fmt.Println(t.getCaster())15}16import "fmt"17func main() {18 t.setCaster("James")19 fmt.Println(t.getCaster())20}21import "fmt"22func main() {23 t.setCaster("James")24 fmt.Println(t.getCaster())25}26import "fmt"27func main() {28 t.setCaster("James")29 fmt.Println(t.getCaster())30}31import "fmt"32func main() {33 t.setCaster("James")34 fmt.Println(t.getCaster())35}36import "fmt"37func main() {38 t.setCaster("James")39 fmt.Println(t.getCaster())40}41import "fmt"42func main() {43 t.setCaster("James")44 fmt.Println(t.getCaster())45}46import "fmt"47func main() {48 t.setCaster("James")49 fmt.Println(t.getCaster())50}

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getCaster

Using AI Code Generation

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1import (2func main() {3 fmt.Println(golenv.GetCaster("GOPATH"))4}5import (6func main() {7 fmt.Println(golenv.GetCaster("GOPATH"))8}9import (10func main() {11 fmt.Println(golenv.GetCaster("GOPATH"))12}

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getCaster

Using AI Code Generation

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1import "fmt"2func main() {3 var x interface{}4 fmt.Println(x)5 fmt.Printf("Type of x is %T6 fmt.Println(x)7 fmt.Printf("Type of x is %T8 fmt.Println(x)9 fmt.Printf("Type of x is %T10}

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getCaster

Using AI Code Generation

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1type TowerDefense struct {2}3type Caster struct {4}5func getCaster() Caster {6 return Caster{7 }8}9I do not think this is the way to go. I am not sure what you are trying to do. If you want to use the getCaster() method of td package, you should call it like this:10import "td"11func main() {12 t.Caster = td.getCaster()13}14If you want to use the getCaster() method of the td.TowerDefense struct, you should call it like this:15import "td"16func main() {17 t.Caster = t.getCaster()18}19import "td"20func main() {21 t.Caster = td.Caster{22 }23}

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