How to use Isa method of td Package
Best Go-testdeep code snippet using td.Isa
td_isa_test.go
Source:td_isa_test.go 
...10 "testing"11 "github.com/maxatome/go-testdeep/internal/test"12 "github.com/maxatome/go-testdeep/td"13)14func TestIsa(t *testing.T) {15 gotStruct := MyStruct{16 MyStructMid: MyStructMid{17 MyStructBase: MyStructBase{18 ValBool: true,19 },20 ValStr: "foobar",21 },22 ValInt: 123,23 }24 checkOK(t, &gotStruct, td.Isa(&MyStruct{}))25 checkOK(t, (*MyStruct)(nil), td.Isa(&MyStruct{}))26 checkOK(t, (*MyStruct)(nil), td.Isa((*MyStruct)(nil)))27 checkOK(t, gotStruct, td.Isa(MyStruct{}))28 checkOK(t, bytes.NewBufferString("foobar"),29 td.Isa((*fmt.Stringer)(nil)),30 "checks bytes.NewBufferString() implements fmt.Stringer")31 // does bytes.NewBufferString("foobar") implements fmt.Stringer?32 checkOK(t, bytes.NewBufferString("foobar"), td.Isa((*fmt.Stringer)(nil)))33 checkError(t, &gotStruct, td.Isa(&MyStructBase{}),34 expectedError{35 Message: mustBe("type mismatch"),36 Path: mustBe("DATA"),37 Got: mustContain("*td_test.MyStruct"),38 Expected: mustContain("*td_test.MyStructBase"),39 })40 checkError(t, (*MyStruct)(nil), td.Isa(&MyStructBase{}),41 expectedError{42 Message: mustBe("type mismatch"),43 Path: mustBe("DATA"),44 Got: mustContain("*td_test.MyStruct"),45 Expected: mustContain("*td_test.MyStructBase"),46 })47 checkError(t, gotStruct, td.Isa(&MyStruct{}),48 expectedError{49 Message: mustBe("type mismatch"),50 Path: mustBe("DATA"),51 Got: mustContain("td_test.MyStruct"),52 Expected: mustContain("*td_test.MyStruct"),53 })54 checkError(t, &gotStruct, td.Isa(MyStruct{}),55 expectedError{56 Message: mustBe("type mismatch"),57 Path: mustBe("DATA"),58 Got: mustContain("*td_test.MyStruct"),59 Expected: mustContain("td_test.MyStruct"),60 })61 gotSlice := []int{1, 2, 3}62 checkOK(t, gotSlice, td.Isa([]int{}))63 checkOK(t, &gotSlice, td.Isa(((*[]int)(nil))))64 checkError(t, &gotSlice, td.Isa([]int{}),65 expectedError{66 Message: mustBe("type mismatch"),67 Path: mustBe("DATA"),68 Got: mustContain("*[]int"),69 Expected: mustContain("[]int"),70 })71 checkError(t, gotSlice, td.Isa((*[]int)(nil)),72 expectedError{73 Message: mustBe("type mismatch"),74 Path: mustBe("DATA"),75 Got: mustContain("[]int"),76 Expected: mustContain("*[]int"),77 })78 checkError(t, gotSlice, td.Isa([1]int{2}),79 expectedError{80 Message: mustBe("type mismatch"),81 Path: mustBe("DATA"),82 Got: mustContain("[]int"),83 Expected: mustContain("[1]int"),84 })85 //86 // Bad usage87 checkError(t, "never tested",88 td.Isa(nil),89 expectedError{90 Message: mustBe("bad usage of Isa operator"),91 Path: mustBe("DATA"),92 Summary: mustBe("Isa(nil) is not allowed. To check an interface, try Isa((*fmt.Stringer)(nil)), for fmt.Stringer for example"),93 })94 //95 // String96 test.EqualStr(t, td.Isa((*MyStruct)(nil)).String(),97 "*td_test.MyStruct")98 // Erroneous op99 test.EqualStr(t, td.Isa(nil).String(), "Isa(<ERROR>)")100}101func TestIsaTypeBehind(t *testing.T) {102 equalTypes(t, td.Isa(([]int)(nil)), []int{})103 equalTypes(t, td.Isa((*fmt.Stringer)(nil)), (*fmt.Stringer)(nil))104 // Erroneous op105 equalTypes(t, td.Isa(nil), nil)106}...
td_isa.go
Source:td_isa.go
...7import (8 "reflect"9 "github.com/maxatome/go-testdeep/internal/ctxerr"10)11type tdIsa struct {12 tdExpectedType13 checkImplement bool14}15var _ TestDeep = &tdIsa{}16// summary(Isa): checks the data type or whether data implements an17// interface or not18// input(Isa): bool,str,int,float,cplx,array,slice,map,struct,ptr,chan,func19// Isa operator checks the data type or whether data implements an20// interface or not.21//22// Typical type checks:23//24// td.Cmp(t, time.Now(), td.Isa(time.Time{})) // succeeds25// td.Cmp(t, time.Now(), td.Isa(&time.Time{})) // fails, as not a *time.Time26// td.Cmp(t, got, td.Isa(map[string]time.Time{}))27//28// For interfaces, it is a bit more complicated, as:29//30// fmt.Stringer(nil)31//32// is not an interface, but just nil⦠To bypass this golang33// limitation, Isa accepts pointers on interfaces. So checking that34// data implements [fmt.Stringer] interface should be written as:35//36// td.Cmp(t, bytes.Buffer{}, td.Isa((*fmt.Stringer)(nil))) // succeeds37//38// Of course, in the latter case, if checked data type is39// [*fmt.Stringer], Isa will match too (in fact before checking whether40// it implements [fmt.Stringer] or not).41//42// TypeBehind method returns the [reflect.Type] of model.43func Isa(model any) TestDeep {44 modelType := reflect.TypeOf(model)45 i := tdIsa{46 tdExpectedType: tdExpectedType{47 base: newBase(3),48 expectedType: modelType,49 },50 }51 if modelType == nil {52 i.err = ctxerr.OpBad("Isa", "Isa(nil) is not allowed. To check an interface, try Isa((*fmt.Stringer)(nil)), for fmt.Stringer for example")53 return &i54 }55 i.checkImplement = modelType.Kind() == reflect.Ptr &&56 modelType.Elem().Kind() == reflect.Interface57 return &i58}59func (i *tdIsa) Match(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error {60 if i.err != nil {61 return ctx.CollectError(i.err)62 }63 gotType := got.Type()64 if gotType == i.expectedType {65 return nil66 }67 if i.checkImplement {68 if gotType.Implements(i.expectedType.Elem()) {69 return nil70 }71 }72 if ctx.BooleanError {73 return ctxerr.BooleanError74 }75 return ctx.CollectError(i.errorTypeMismatch(gotType))76}77func (i *tdIsa) String() string {78 if i.err != nil {79 return i.stringError()80 }81 return i.expectedType.String()82}...
td_any_test.go
Source:td_any_test.go
...50 equalTypes(t,51 td.Any(52 td.Empty(),53 5,54 td.Isa((*error)(nil)), // interface type (in fact pointer to ...)55 td.Any(6, 7),56 td.Isa((*fmt.Stringer)(nil)), // interface type57 8),58 42)59 // Only one interface type60 equalTypes(t,61 td.Any(62 td.Isa((*error)(nil)),63 td.Isa((*error)(nil)),64 td.Isa((*error)(nil)),65 ),66 (*error)(nil))67 // Several interface types, cannot be sure68 equalTypes(t,69 td.Any(70 td.Isa((*error)(nil)),71 td.Isa((*fmt.Stringer)(nil)),72 ),73 nil)74 equalTypes(t,75 td.Any(76 td.Code(func(x any) bool { return true }),77 td.Code(func(y int) bool { return true }),78 ),79 12)80}...
Isa
Using AI Code Generation
1import (2type T struct {3}4func main() {5 t := T{23, "skidoo"}6 s := reflect.ValueOf(&t).Elem()7 typeOfT := s.Type()8 for i := 0; i < s.NumField(); i++ {9 f := s.Field(i)10 fmt.Printf("%d: %s %s = %v11 typeOfT.Field(i).Name, f.Type(), f.Interface())12 }13 s.Field(0).SetInt(77)14 s.Field(1).SetString("Sunset Strip")15 fmt.Println("t is now", t)16}17import (18type T struct {19}20func main() {21 fmt.Println("type:", reflect.TypeOf(x))22 v := reflect.ValueOf(x)23 fmt.Println("value:", v)24 fmt.Println("kind is float64:", v.Kind() == reflect.Float64)25 fmt.Println("value:", v.Float())26 fmt.Println(v.Interface())27 fmt.Printf("value is %5.2e28", v.Interface())29 y := v.Interface().(float64)30 fmt.Println(y)31}32import (33type T struct {34}35func main() {36 fmt.Println("type:", reflect.TypeOf(x))37 v := reflect.ValueOf(x)38 fmt.Println("settability of v:", v.CanSet())39 v = reflect.ValueOf(&x)40 fmt.Println("type of v:", v.Type())41 fmt.Println("settability of v:", v.CanSet())42 v = v.Elem()43 fmt.Println("The Elem of v is:", v)44 fmt.Println("settability of v:", v.CanSet())45 v.SetFloat(7.1)46 fmt.Println(v.Interface())47 fmt.Println(v)48}
Isa
Using AI Code Generation
1import (2type td interface {3 Isa() string4}5type t1 struct {6}7type t2 struct {8}9func (t t1) Isa() string {10}11func (t t2) Isa() string {12}13func main() {14 a = t1{}15 b = t2{}16 fmt.Println(a.Isa())17 fmt.Println(b.Isa())18}19import (20type td interface {21 Isa() string22}23type t1 struct {24}25type t2 struct {26}27func (t t1) Isa() string {28}29func (t t2) Isa() string {30}31func main() {32 a = t1{}33 switch a.(type) {34 fmt.Println("t1")35 fmt.Println("t2")36 }37}38import (39type td interface {40 Isa() string41}42type t1 struct {43}44type t2 struct {45}46func (t t1) Isa() string {47}48func (t t2) Isa() string {49}50func main() {51 a = t1{}52 switch a.(type) {53 fmt.Println("t1")54 fmt.Println("t2")55 }56}57import (58type td interface {59 Isa() string60}61type t1 struct {62}63type t2 struct {64}65func (t t1) Isa() string {66}67func (t t2) Isa() string {68}69func main() {70 a = t1{}71 switch a.(type) {72 fmt.Println("t1")73 fmt.Println("t2")74 }75}76import (77type td interface {
Isa
Using AI Code Generation
1import "fmt"2type td struct {3}4func main() {5 fmt.Println(x)6 fmt.Println(x.Isa(x.a))7 fmt.Println(x.Isa(x.b))8 fmt.Println(x.Isa(x.c))9}10import "fmt"11type td struct {12}13func (t td) Isa(v interface{}) bool {14 switch v.(type) {15 }16}17func main() {18 fmt.Println(x)19 fmt.Println(x.Isa(x.a))20 fmt.Println(x.Isa(x.b))21 fmt.Println(x.Isa(x.c))22}23{10 3.14 hello}24import "fmt"25type td struct {26}27func main() {28 fmt.Println(x)29 fmt.Println(x.Isa(&x.a))30 fmt.Println(x.Isa(&x.b))31 fmt.Println(x.Isa(&x.c))32}33import "fmt"34type td struct {35}36func (t *
Isa
Using AI Code Generation
1import "fmt"2type td struct {3}4func (t td) Isa() {5 fmt.Println("This is a method of td class")6}7func main() {8 t.Isa()9}10import "fmt"11type td struct {12}13func (t *td) Isa() {14 fmt.Println("This is a method of td class")15}16func main() {17 t.Isa()18}19import "fmt"20type td struct {21}22func (t td) Isa() {23 fmt.Println("This is a method of td class")24}25func main() {26 t.Isa()27 t1.Isa()28}29import "fmt"30type td struct {31}32func (t *td) Isa() {33 fmt.Println("This is a method of td class")34}35func main() {36 t.Isa()37 t1.Isa()38}
Isa
Using AI Code Generation
1import (2type td struct {3}4func (t td) String() string {5return fmt.Sprintf("%d %s", t.A, t.B)6}7func main() {8t := td{1, "hello"}9fmt.Println(reflect.TypeOf(t).String())10fmt.Println(reflect.TypeOf(t).Name())11fmt.Println(reflect.TypeOf(t).Kind())12fmt.Println(reflect.TypeOf(t).PkgPath())13fmt.Println(reflect.TypeOf(t).NumMethod())14fmt.Println(reflect.TypeOf(t).Method(0))15fmt.Println(reflect.TypeOf(t).MethodByName("String"))16}17{String func(main.td) string 0 [0] false}18{String func(main.td) string 0 [0] false}
Isa
Using AI Code Generation
1import (2func main() {3 fmt.Println(reflect.TypeOf(a).Kind() == reflect.Int)4 fmt.Println(reflect.TypeOf(b).Kind() == reflect.Float64)5 fmt.Println(reflect.TypeOf(c).Kind() == reflect.String)6 fmt.Println(reflect.TypeOf(d).Kind() == reflect.Int64)7 fmt.Println(reflect.TypeOf(e).Kind() == reflect.Int32)8 fmt.Println(reflect.TypeOf(f).Kind() == reflect.Float32)9}
Isa
Using AI Code Generation
1import (2type td struct {3}4func (t td) Isa() {5 fmt.Println("Isa")6}7func main() {8 t.Isa()9}10import (11type td struct {12}13func (t td) Isa() {14 fmt.Println("Isa")15}16type tdd struct {17}18func (t tdd) Isa() {19 fmt.Println("Isa in tdd")20}21func main() {22 t.Isa()23 t1.Isa()24}25import (26type td struct {27}28func (t td) Isa() {29 fmt.Println("Isa")30}31func (t td) Isa1(i int) {32 fmt.Println("Isa1", i)33}34func (t td) Isa2(i int, j int) {35 fmt.Println("Isa2", i, j)36}37func main() {38 t.Isa()39 t.Isa1(1)40 t.Isa2(1, 2)41}
Isa
Using AI Code Generation
1import (2type td struct {3}4func (t *td) Isa() {5 fmt.Println("I am a method of td")6}7func main() {8 t.Isa()9 fmt.Println(t.name)10 for i := range iter.N(10) {11 fmt.Println(i)12 }13}14import (15type td struct {16}17func (t *td) Isa() {18 fmt.Println("I am a method of td")19}20func main() {21 t.Isa()22 fmt.Println(t.name)23 for i := range iter.N(10) {24 fmt.Println(i)25 }26}27import (28type td struct {29}30func (t *td) Isa() {31 fmt.Println("I am a method of td")32}33func main() {34 t.Isa()35 fmt.Println(t.name)36 for i := range iter.N(10) {37 fmt.Println(i)38 }39}40import (41type td struct {42}43func (t *td) Isa() {44 fmt.Println("I am a method of td")45}46func main() {47 t.Isa()48 fmt.Println(t.name)49 for i := range iter.N(10) {50 fmt.Println(i)51 }52}
Isa
Using AI Code Generation
1import (2func main() {3 fmt.Println(td1.Isa(&td))4}5import (6func main() {7 fmt.Println(td1.Isa(&td))8}9import (10func main() {11 fmt.Println(td1.Isa(&td))12}13import (14func main() {15 fmt.Println(td1.Isa(&td))16}17import (18func main() {19 fmt.Println(td1.Isa(&td))20}21import (22func main() {23 fmt.Println(td1.Isa(&td))24}25import (26func main() {27 fmt.Println(td1.Isa(&td))28}29import (30func main() {31 fmt.Println(td1.Isa(&td))32}33import (34func main() {35 fmt.Println(td1.Isa(&td))36}37import (38func main()
Isa
Using AI Code Generation
1import (2type td struct {3}4func (t td) Isa() {5 fmt.Println("td class")6}7func main() {8 t.Isa()9}
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