Feature/#220 iframe support (#315)

* Refactored Virtual DOM structure
* Added new E2E tests
* Updated E2E Test Runner

pkg/drivers/helpers.go

@@ -2,8 +2,52 @@ package drivers
 
 import (
 	"context"
+	"github.com/MontFerret/ferret/pkg/runtime/core"
 )
 
 func WithDefaultTimeout(ctx context.Context) (context.Context, context.CancelFunc) {
 	return context.WithTimeout(ctx, DefaultTimeout)
 }
+
+func ToPage(value core.Value) (HTMLPage, error) {
+	err := core.ValidateType(value, HTMLPageType)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return value.(HTMLPage), nil
+}
+
+func ToDocument(value core.Value) (HTMLDocument, error) {
+	switch v := value.(type) {
+	case HTMLPage:
+		return v.GetMainFrame(), nil
+	case HTMLDocument:
+		return v, nil
+	default:
+		return nil, core.TypeError(
+			value.Type(),
+			HTMLPageType,
+			HTMLDocumentType,
+		)
+	}
+}
+
+func ToElement(value core.Value) (HTMLElement, error) {
+	switch v := value.(type) {
+	case HTMLPage:
+		return v.GetMainFrame().GetElement(), nil
+	case HTMLDocument:
+		return v.GetElement(), nil
+	case HTMLElement:
+		return v, nil
+	default:
+		return nil, core.TypeError(
+			value.Type(),
+			HTMLPageType,
+			HTMLDocumentType,
+			HTMLElementType,
+		)
+	}
+}