fix(validation): correct CustomValidator and strutils.Parser handling, add tests

internal/serialization/validation_struct_ptr_test.go

@@ -0,0 +1,69 @@
+package serialization
+
+import (
+	"reflect"
+	"testing"
+
+	gperr "github.com/yusing/goutils/errs"
+)
+
+type CustomValidatingPointerStruct struct {
+	Value string
+}
+
+func (c *CustomValidatingPointerStruct) Validate() gperr.Error {
+	if c == nil {
+		return gperr.New("pointer struct cannot be nil")
+	}
+	if c.Value == "" {
+		return gperr.New("value cannot be empty")
+	}
+	if len(c.Value) < 3 {
+		return gperr.New("value must be at least 3 characters")
+	}
+	return nil
+}
+
+func TestValidateWithCustomValidator_CustomValidatingPointerStructValue(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   CustomValidatingPointerStruct
+		wantErr bool
+	}{
+		{"custom validating pointer struct as value - valid", CustomValidatingPointerStruct{Value: "hello"}, false},
+		{"custom validating pointer struct as value - empty", CustomValidatingPointerStruct{Value: ""}, false},
+		{"custom validating pointer struct as value - short", CustomValidatingPointerStruct{Value: "hi"}, false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := ValidateWithCustomValidator(reflect.ValueOf(tt.input))
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ValidateWithCustomValidator() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
+
+func TestValidateWithCustomValidator_CustomValidatingPointerStructPointer(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   *CustomValidatingPointerStruct
+		wantErr bool
+	}{
+		{"valid custom validating pointer struct", &CustomValidatingPointerStruct{Value: "hello"}, false},
+		{"nil custom validating pointer struct", nil, true}, // Should fail because Validate() checks for nil
+		{"invalid custom validating pointer struct - empty", &CustomValidatingPointerStruct{Value: ""}, true},
+		{"invalid custom validating pointer struct - too short", &CustomValidatingPointerStruct{Value: "hi"}, true},
+		{"valid custom validating pointer struct - minimum length", &CustomValidatingPointerStruct{Value: "abc"}, false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := ValidateWithCustomValidator(reflect.ValueOf(tt.input))
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ValidateWithCustomValidator() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}