--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_objectstreams.py	Mon Sep 15 11:37:51 2025 +0200
@@ -0,0 +1,83 @@
+import pymupdf
+
+
+def test_objectstream1():
+    """Test save option "use_objstms".
+    This option compresses PDF object definitions into a special object type
+    "ObjStm". We test its presence by searching for that /Type.
+    """
+    if not hasattr(pymupdf, "mupdf"):
+        # only implemented for rebased
+        return
+
+    # make some arbitrary page with content
+    text = "Hello, World! Hallo, Welt!"
+    doc = pymupdf.open()
+    page = doc.new_page()
+    rect = (50, 50, 200, 500)
+
+    page.insert_htmlbox(rect, text)  # place into the rectangle
+    _ = doc.write(use_objstms=True)
+    found = False
+    for xref in range(1, doc.xref_length()):
+        objstring = doc.xref_object(xref, compressed=True)
+        if "/Type/ObjStm" in objstring:
+            found = True
+            break
+    assert found, "No object stream found"
+
+
+def test_objectstream2():
+    """Test save option "use_objstms".
+    This option compresses PDF object definitions into a special object type
+    "ObjStm". We test its presence by searching for that /Type.
+    """
+    if not hasattr(pymupdf, "mupdf"):
+        # only implemented for rebased
+        return
+
+    # make some arbitrary page with content
+    text = "Hello, World! Hallo, Welt!"
+    doc = pymupdf.open()
+    page = doc.new_page()
+    rect = (50, 50, 200, 500)
+
+    page.insert_htmlbox(rect, text)  # place into the rectangle
+    _ = doc.write(use_objstms=False)
+
+    found = False
+    for xref in range(1, doc.xref_length()):
+        objstring = doc.xref_object(xref, compressed=True)
+        if "/Type/ObjStm" in objstring:
+            found = True
+            break
+    assert not found, "Unexpected: Object stream found!"
+
+
+def test_objectstream3():
+    """Test ez_save().
+    Should automatically use object streams
+    """
+    if not hasattr(pymupdf, "mupdf"):
+        # only implemented for rebased
+        return
+    import io
+
+    fp = io.BytesIO()
+
+    # make some arbitrary page with content
+    text = "Hello, World! Hallo, Welt!"
+    doc = pymupdf.open()
+    page = doc.new_page()
+    rect = (50, 50, 200, 500)
+
+    page.insert_htmlbox(rect, text)  # place into the rectangle
+
+    doc.ez_save(fp)  # save PDF to memory
+    found = False
+    for xref in range(1, doc.xref_length()):
+        objstring = doc.xref_object(xref, compressed=True)
+        if "/Type/ObjStm" in objstring:
+            found = True
+            break
+    assert found, "No object stream found!"