improve pageobjects testing

tests/helpers/test_opener.py

@@ -202,7 +202,7 @@ def test_open_invalid():
 
 def test_object_hierarchy():
 
-    pdf = pdfium.PdfDocument(TestFiles.empty)
+    pdf = pdfium.PdfDocument(TestFiles.images)
     assert isinstance(pdf, pdfium.PdfDocument)
     assert isinstance(pdf.raw, pdfium.FPDF_DOCUMENT)
 
@@ -211,6 +211,12 @@ def test_object_hierarchy():
     assert isinstance(page.raw, pdfium.FPDF_PAGE)
     assert page.pdf is pdf
 
+    pageobj = next(page.get_objects())
+    assert isinstance(pageobj, pdfium.PdfPageObject)
+    assert isinstance(pageobj.raw, pdfium.FPDF_PAGEOBJECT)
+    assert isinstance(pageobj.type, int)
+    assert pageobj.page is page
+
     textpage = page.get_textpage()
     assert isinstance(textpage, pdfium.PdfTextPage)
     assert isinstance(textpage.raw, pdfium.FPDF_TEXTPAGE)

tests/helpers/test_page.py

@@ -3,6 +3,7 @@
 
 import pytest
 import pypdfium2 as pdfium
+from pypdfium2._helpers._utils import ObjtypeToName
 from ..conftest import TestFiles
 
 
@@ -52,7 +53,12 @@ def test_pageobjects():
     pdf = pdfium.PdfDocument(TestFiles.images)
     page = pdf.get_page(0)
 
-    images = [obj for obj in page.get_objects() if obj.type == pdfium.FPDF_PAGEOBJ_IMAGE]
+    images = []
+    for obj in page.get_objects():
+        assert obj.type in ObjtypeToName.keys()
+        if obj.type == pdfium.FPDF_PAGEOBJ_IMAGE:
+            assert obj.level == 0
+            images.append(obj)
     assert len(images) == 3
 
     positions = [img.get_pos() for img in images]