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How to use WithCmpHooks method of td Package

Best Go-testdeep code snippet using td.WithCmpHooks

t_hooks.go

Source:t_hooks.go

...6package td7import (8	"github.com/maxatome/go-testdeep/internal/color"9)10// WithCmpHooks returns a new [*T] instance with new Cmp hooks recorded11// using functions passed in fns.12//13// Each function in fns has to be a function with the following14// possible signatures:15//16//	func (got A, expected A) bool17//	func (got A, expected A) error18//19// First arg is always got, and second is always expected.20//21// A cannot be an interface. This restriction can be removed in the22// future, if really needed.23//24// This function is called as soon as possible each time the type A is25// encountered for got while expected type is assignable to A.26//27// When it returns a bool, false means A is not equal to B.28//29// When it returns a non-nil error (meaning got â  expected), its30// content is used to tell the reason of the failure.31//32// Cmp hooks are checked before [UseEqual] feature.33//34// Cmp hooks are run just after [Smuggle] hooks.35//36//	func TestCmpHook(tt *testing.T) {37//	  t := td.NewT(tt)38//39//	  // Test reflect.Value contents instead of default field/field40//	  t = t.WithCmpHooks(func (got, expected reflect.Value) bool {41//	    return td.EqDeeply(got.Interface(), expected.Interface())42//	  })43//	  a, b := 1, 144//	  t.Cmp(reflect.ValueOf(&a), reflect.ValueOf(&b)) // succeeds45//46//	  // Test reflect.Type correctly instead of default field/field47//	  t = t.WithCmpHooks(func (got, expected reflect.Type) bool {48//	    return got == expected49//	  })50//51//	  // Test time.Time via its Equal() method instead of default52//	  // field/field (note it bypasses the UseEqual flag)53//	  t = t.WithCmpHooks((time.Time).Equal)54//	  date, _ := time.Parse(time.RFC3339, "2020-09-08T22:13:54+02:00")55//	  t.Cmp(date, date.UTC()) // succeeds56//57//	  // Several hooks can be declared at once58//	  t = t.WithCmpHooks(59//	    func (got, expected reflect.Value) bool {60//	      return td.EqDeeply(got.Interface(), expected.Interface())61//	    },62//	    func (got, expected reflect.Type) bool {63//	      return got == expected64//	    },65//	    (time.Time).Equal,66//	  )67//	}68//69// There is no way to add or remove hooks of an existing [*T]70// instance, only to create a new [*T] instance with this method or71// [T.WithSmuggleHooks] to add some.72//73// WithCmpHooks calls t.Fatal if an item of fns is not a function or74// if its signature does not match the expected ones.75//76// See also [T.WithSmuggleHooks].77//78// [UseEqual]: https://pkg.go.dev/github.com/maxatome/go-testdeep/td#ContextConfig.UseEqual79func (t *T) WithCmpHooks(fns ...any) *T {80	t = t.copyWithHooks()81	err := t.Config.hooks.AddCmpHooks(fns)82	if err != nil {83		t.Helper()84		t.Fatal(color.Bad("WithCmpHooks " + err.Error()))85	}86	return t87}88// WithSmuggleHooks returns a new [*T] instance with new Smuggle hooks89// recorded using functions passed in fns.90//91// Each function in fns has to be a function with the following92// possible signatures:93//94//	func (got A) B95//	func (got A) (B, error)96//97// A cannot be an interface. This restriction can be removed in the98// future, if really needed.99//100// B cannot be an interface. If you have a use case, we can talk about it.101//102// This function is called as soon as possible each time the type A is103// encountered for got.104//105// The B value returned replaces the got value for subsequent tests.106// Smuggle hooks are NOT run again for this returned value to avoid107// easy infinite loop recursion.108//109// When it returns non-nil error (meaning something wrong happened110// during the conversion of A to B), it raises a global error and its111// content is used to tell the reason of the failure.112//113// Smuggle hooks are run just before Cmp hooks.114//115//	func TestSmuggleHook(tt *testing.T) {116//	  t := td.NewT(tt)117//118//	  // Each encountered int is changed to a bool119//	  t = t.WithSmuggleHooks(func (got int) bool {120//	    return got != 0121//	  })122//	  t.Cmp(map[string]int{"ok": 1, "no": 0},123//	    map[string]bool{"ok", true, "no", false}) // succeeds124//125//	  // Each encountered string is converted to int126//	  t = t.WithSmuggleHooks(strconv.Atoi)127//	  t.Cmp("123", 123) // succeeds128//129//	  // Several hooks can be declared at once130//	  t = t.WithSmuggleHooks(131//	    func (got int) bool { return got != 0 },132//	    strconv.Atoi,133//	  )134//	}135//136// There is no way to add or remove hooks of an existing [*T]137// instance, only create a new [*T] instance with this method or138// [T.WithCmpHooks] to add some.139//140// WithSmuggleHooks calls t.Fatal if an item of fns is not a141// function or if its signature does not match the expected ones.142//143// See also [T.WithCmpHooks].144func (t *T) WithSmuggleHooks(fns ...any) *T {145	t = t.copyWithHooks()146	err := t.Config.hooks.AddSmuggleHooks(fns)147	if err != nil {148		t.Helper()149		t.Fatal(color.Bad("WithSmuggleHooks " + err.Error()))150	}151	return t152}153func (t *T) copyWithHooks() *T {154	nt := NewT(t)155	nt.Config.hooks = t.Config.hooks.Copy()156	return nt157}...

t_hooks_test.go

Source:t_hooks_test.go

...14	"time"15	"github.com/maxatome/go-testdeep/internal/test"16	"github.com/maxatome/go-testdeep/td"17)18func TestWithCmpHooks(tt *testing.T) {19	na, nb := 1234, 123420	date, _ := time.Parse(time.RFC3339, "2020-09-08T22:13:54+02:00")21	for _, tst := range []struct {22		name          string23		cmp           any24		got, expected any25	}{26		{27			name: "reflect.Value",28			cmp: func(got, expected reflect.Value) bool {29				return td.EqDeeply(got.Interface(), expected.Interface())30			},31			got:      reflect.ValueOf(&na),32			expected: reflect.ValueOf(&nb),33		},34		{35			name:     "time.Time",36			cmp:      (time.Time).Equal,37			got:      date,38			expected: date.UTC(),39		},40		{41			name: "numify",42			cmp: func(got, expected string) error {43				ngot, err := strconv.Atoi(got)44				if err != nil {45					return fmt.Errorf("strconv.Atoi(got) failed: %s", err)46				}47				nexpected, err := strconv.Atoi(expected)48				if err != nil {49					return fmt.Errorf("strconv.Atoi(expected) failed: %s", err)50				}51				if ngot != nexpected {52					return errors.New("values differ")53				}54				return nil55			},56			got:      "0000001234",57			expected: "1234",58		},59		{60			name: "false test :)",61			cmp: func(got, expected int) bool {62				return got == -expected63			},64			got:      1,65			expected: -1,66		},67	} {68		tt.Run(tst.name, func(tt *testing.T) {69			ttt := test.NewTestingTB(tt.Name())70			t := td.NewT(ttt)71			td.CmpFalse(tt, func() bool {72				// A panic can occur when -tags safe:73				//   dark.GetInterface() does not handle private unsafe.Pointer kind74				defer func() { recover() }() //nolint: errcheck75				return t.Cmp(tst.got, tst.expected)76			}())77			t = t.WithCmpHooks(tst.cmp)78			td.CmpTrue(tt, t.Cmp(tst.got, tst.expected))79		})80	}81	tt.Run("Error", func(tt *testing.T) {82		ttt := test.NewTestingTB(tt.Name())83		t := td.NewT(ttt).84			WithCmpHooks(func(got, expected int) error {85				return errors.New("never equal")86			})87		td.CmpFalse(tt, t.Cmp(1, 1))88		if !strings.Contains(ttt.LastMessage(), "DATA: never equal\n") {89			tt.Errorf(`<%s> does not contain "DATA: never equal\n"`, ttt.LastMessage())90		}91	})92	for _, tst := range []struct {93		name  string94		cmp   any95		fatal string96	}{97		{98			name:  "not a function",99			cmp:   "Booh",100			fatal: "WithCmpHooks expects a function, not a string",101		},102		{103			name:  "wrong signature",104			cmp:   func(a []int, b ...int) bool { return false },105			fatal: "WithCmpHooks expects: func (T, T) bool|error not ",106		},107	} {108		tt.Run("panic: "+tst.name, func(tt *testing.T) {109			ttt := test.NewTestingTB(tt.Name())110			t := td.NewT(ttt)111			fatalMesg := ttt.CatchFatal(func() { t.WithCmpHooks(tst.cmp) })112			test.IsTrue(tt, ttt.IsFatal)113			if !strings.Contains(fatalMesg, tst.fatal) {114				tt.Errorf(`<%s> does not contain %q`, fatalMesg, tst.fatal)115			}116		})117	}118}119func TestWithSmuggleHooks(tt *testing.T) {120	for _, tst := range []struct {121		name          string122		cmp           any123		got, expected any124	}{125		{...

parser_test.go

Source:parser_test.go

...34	wantFile, err := parser.ParseFile(wantFset, "test.bake", goSrcReader, 0)35	t.CmpNoError(err)36	{37		// ignore some fields, so that we could use t.Cmp38		t = t.WithCmpHooks(func(token.Pos, token.Pos) error { return nil })     // ignoring just to simplify the comparison39		t = t.WithCmpHooks(func(*ast.Object, *ast.Object) error { return nil }) // not used40		wantFile.Scope = nil                                                    // not used41		wantFile.Unresolved = nil                                               // not used42		wantFile.Imports = nil                                                  // imports are added in wantFile.Decls43	}44	if !t.Cmp(gotFile, wantFile) {45		ast.Print(prsr.FileSet, gotFile)46		t.FailNow()47	}48}...

WithCmpHooks

Using AI Code Generation

1import (2func main() {3	td.Cmp(t, 1, td.WithCmpHooks(4		func(got, expected interface{}) bool {5		},6		func(got, expected interface{}) string {7		},8}9import (10func main() {11	td.Cmp(t, 1, td.WithCmpHook(12		func(got, expected interface{}) bool {13		},14}15import (16func main() {17	td.Cmp(t, 1, td.WithCmpHookDeeply(18		func(got, expected interface{}) bool {19		},20}21import (22func main() {23	td.Cmp(t, 1, td.WithCmpHookDeeply(24		func(got, expected interface{}) bool {25		},26		func(got, expected interface{}) string {27		},28}29import (

WithCmpHooks

Using AI Code Generation

1import (2type User struct {3}4func main() {5	u := User{Name: "Bob"}6	fmt.Println(td.Cmp(u, td.WithCmpHooks(td.CmpOptions{}, func(ctx td.CmpContext) bool {7		if ctx.Value.Kind() == td.KindStruct {8			ctx.Value = ctx.Value.MapIndex(td.String("Name"))9		}10	})))11}

WithCmpHooks

Using AI Code Generation

1import (2func main() {3	fmt.Println(testdeep.Cmp(a, b, c, d, e, f, g, h))4	fmt.Println(testdeep.Cmp(a, b, c, d, e, f, g, h, testdeep.WithCmpHooks(testdeep.CmpHooks{5		testdeep.IntType: func(a, b int) bool {6		},7	})))8}

WithCmpHooks

Using AI Code Generation

1import (2type TestSuite struct {3}4func (s *TestSuite) TestWithCmpHooks() {5	var actual = []string{"a", "b", "c"}6	var expected = []string{"c", "b", "a"}7	var cmp = toolbox.NewCmp()8	cmp.WithCmpHooks(func(actual interface{}, expected interface{}) bool {9		if actualSlice, ok := actual.([]string); ok {10			if expectedSlice, ok := expected.([]string); ok {11				sort.Strings(actualSlice)12				sort.Strings(expectedSlice)13				return toolbox.Cmp(actualSlice, expectedSlice, cmp)14			}15		}16	})17	assert.True(s.T(), toolbox.Cmp(actual, expected, cmp))18}19func TestTestSuite(t *testing.T) {20	suite.Run(t, new(TestSuite))21}22import (23type TestSuite struct {24}25func (s *TestSuite) TestWithCmpHooks() {26	var actual = map[string]string{"a": "a", "b": "b", "c": "c"}27	var expected = map[string]string{"c": "c", "b": "b", "a": "a"}28	var cmp = toolbox.NewCmp()29	cmp.WithCmpHooks(func(actual interface{}, expected interface{}) bool {30		if actualMap, ok := actual.(map[string]string); ok {31			if expectedMap, ok := expected.(map[string]string); ok {32				var actualKeys = make([]string, 0)33				var expectedKeys = make([]string, 0)34				for k := range actualMap {

WithCmpHooks

Using AI Code Generation

1import (2type myStruct struct {3}4func main() {5    testdeep.CmpDeeply(myStruct{1, "a"}, myStruct{1, "a"})6    testdeep.CmpDeeply(myStruct{1, "a"}, myStruct{1, "b"})7}8--- FAIL: TestCmp (0.00s)9        got:  struct { a int; b string }{a:1, b:"b"}10        want: struct { a int; b string }{a:1, b:"a"}11--- PASS: TestCmp (0.00s)12import (13type myStruct struct {14}15func main() {16    testdeep.CmpDeeply(myStruct{1, "a"}, myStruct{1, "a"},17        testdeep.WithCmpHooks(func(got, want interface{}) error {18            fmt.Printf("got: %v, want: %v19        }))20    testdeep.CmpDeeply(myStruct{1, "a"}, myStruct{1, "b"},21        testdeep.WithCmpHooks(func(got, want interface{}) error {22            fmt.Printf("got: %v, want: %v23        }))24}25--- FAIL: TestCmp (0.00s)26        got:  struct { a int; b string }{a:1, b:"b"}

WithCmpHooks

Using AI Code Generation

1import (2func main() {3	type T struct {4	}5	td.CmpHooks[T] = func(t1, t2 T) bool {6	}7	td.CmpHooks[*T] = func(t1, t2 *T) bool {8	}9	td.CmpHooks[[]T] = func(t1, t2 []T) bool {10	}11	td.CmpHooks[[]*T] = func(t1, t2 []*T) bool {12	}13	fmt.Println(td.Cmp(T{"Bob", 42}, T{"Bob", 99}))14	fmt.Println(td.Cmp(&T{"Bob", 42}, &T{"Bob", 99}))15	fmt.Println(td.Cmp([]T{{"Bob", 42}}, []T{{"Bob", 99}}))16	fmt.Println(td.Cmp([]*T{{"Bob", 42}}, []*T{{"Bob", 99}}))17}18import (19func main() {20	type T struct {21	}22	td.CmpHooks[T] = func(t1, t2 T) bool {23	}24	td.CmpHooks[*T] = func(t1, t2 *T) bool {25	}26	td.CmpHooks[[]T] = func(t1, t2 []T) bool {27	}

WithCmpHooks

Using AI Code Generation

1import (2func main() {3	td.CmpHooks(4		td.Smuggle(func(val int) string {5			return fmt.Sprintf("%d", val)6		}, td.String()),7		td.Smuggle(func(val string) int {8			return len(val)9		}, td.Int()),10	).Cmp(123, "3")11}12import (13func main() {14	td.CmpHooks(15		td.Smuggle(func(val int) string {16			return fmt.Sprintf("%d", val)17		}, td.String()),18		td.Smuggle(func(val string) int {19			return len(val)20		}, td.Int()),21	).Cmp(123, "3")22}23import (24func main() {25	td.CmpHooks(26		td.Smuggle(func(val int) string {27			return fmt.Sprintf("%d", val)28		}, td.String()),

WithCmpHooks

Using AI Code Generation

1func main() {2    test := td.NewTest(t)3    td := test.TD()4    td = td.WithCmpHooks(5        td.CmpHook(reflect.TypeOf((*MyInt)(nil)), func(a, b reflect.Value) bool {6            return a.Interface().(MyInt).Value == b.Interface().(MyInt).Value7        }),8}9[MIT](LICENSE)

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