add missing json errors. (#1755)

error.go

@@ -1,6 +1,9 @@
 package fiber
 
-import "github.com/gofiber/fiber/v2/internal/schema"
+import (
+	"github.com/gofiber/fiber/v2/internal/go-json/errors"
+	"github.com/gofiber/fiber/v2/internal/schema"
+)
 
 type (
 	// Conversion error exposes the internal schema.ConversionError for public use.
@@ -12,3 +15,25 @@ type (
 	// MultiError error exposes the internal schema.MultiError for public use.
 	MultiError = schema.MultiError
 )
+
+type (
+	// An InvalidUnmarshalError describes an invalid argument passed to Unmarshal.
+	// (The argument to Unmarshal must be a non-nil pointer.)
+	InvalidUnmarshalError = errors.InvalidUnmarshalError
+
+	// A MarshalerError represents an error from calling a MarshalJSON or MarshalText method.
+	MarshalerError = errors.MarshalerError
+
+	// A SyntaxError is a description of a JSON syntax error.
+	SyntaxError = errors.SyntaxError
+
+	// An UnmarshalTypeError describes a JSON value that was
+	// not appropriate for a value of a specific Go type.
+	UnmarshalTypeError = errors.UnmarshalTypeError
+
+	// An UnsupportedTypeError is returned by Marshal when attempting
+	// to encode an unsupported value type.
+	UnsupportedTypeError = errors.UnsupportedTypeError
+
+	UnsupportedValueError = errors.UnsupportedValueError
+)

error_test.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"testing"
 
+	jerrors "github.com/gofiber/fiber/v2/internal/go-json/errors"
 	"github.com/gofiber/fiber/v2/internal/schema"
 	"github.com/gofiber/fiber/v2/utils"
 )
@@ -27,3 +28,39 @@ func TestMultiError(t *testing.T) {
 	ok := errors.As(MultiError{}, &schema.MultiError{})
 	utils.AssertEqual(t, true, ok)
 }
+
+func TestInvalidUnmarshalError(t *testing.T) {
+	var e *jerrors.InvalidUnmarshalError
+	ok := errors.As(&InvalidUnmarshalError{}, &e)
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestMarshalerError(t *testing.T) {
+	var e *jerrors.MarshalerError
+	ok := errors.As(&MarshalerError{}, &e)
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestSyntaxError(t *testing.T) {
+	var e *jerrors.SyntaxError
+	ok := errors.As(&SyntaxError{}, &e)
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestUnmarshalTypeError(t *testing.T) {
+	var e *jerrors.UnmarshalTypeError
+	ok := errors.As(&UnmarshalTypeError{}, &e)
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestUnsupportedTypeError(t *testing.T) {
+	var e *jerrors.UnsupportedTypeError
+	ok := errors.As(&UnsupportedTypeError{}, &e)
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestUnsupportedValeError(t *testing.T) {
+	var e *jerrors.UnsupportedValueError
+	ok := errors.As(&UnsupportedValueError{}, &e)
+	utils.AssertEqual(t, true, ok)
+}