Expose internal errors. (#1387)

error.go

@@ -0,0 +1,14 @@
+package fiber
+
+import "github.com/gofiber/fiber/v2/internal/schema"
+
+type (
+	// Conversion error exposes the internal schema.ConversionError for public use.
+	ConversionError = schema.ConversionError
+	// UnknownKeyError error exposes the internal schema.UnknownKeyError for public use.
+	UnknownKeyError = schema.UnknownKeyError
+	// EmptyFieldError error exposes the internal schema.EmptyFieldError for public use.
+	EmptyFieldError = schema.EmptyFieldError
+	// MultiError error exposes the internal schema.MultiError for public use.
+	MultiError = schema.MultiError
+)

error_test.go

@@ -0,0 +1,29 @@
+package fiber
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/gofiber/fiber/v2/internal/schema"
+	"github.com/gofiber/fiber/v2/utils"
+)
+
+func TestConversionError(t *testing.T) {
+	ok := errors.As(ConversionError{}, &schema.ConversionError{})
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestUnknownKeyError(t *testing.T) {
+	ok := errors.As(UnknownKeyError{}, &schema.UnknownKeyError{})
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestEmptyFieldError(t *testing.T) {
+	ok := errors.As(EmptyFieldError{}, &schema.EmptyFieldError{})
+	utils.AssertEqual(t, true, ok)
+}
+
+func TestMultiError(t *testing.T) {
+	ok := errors.As(MultiError{}, &schema.MultiError{})
+	utils.AssertEqual(t, true, ok)
+}