diff --git a/tests/kml_test.py b/tests/kml_test.py
index fb04fb25..547161b7 100644
--- a/tests/kml_test.py
+++ b/tests/kml_test.py
@@ -18,6 +18,7 @@
 
 import io
 import pathlib
+import zipfile
 
 import pygeoif as geo
 import pytest
@@ -209,10 +210,16 @@ def test_write_kml_file(self) -> None:
           )
 
         file_path = KMLFILEDIR / "output.kml"
-        doc.write(file_path=file_path, prettyprint=True, xml_declaration=True)
+        doc.write(file_path=file_path, prettyprint=True, xml_declaration=False)
 
         assert file_path.is_file(), "KML file was not created."
 
+        parsed_doc = kml.KML.parse(file_path)
+
+        assert parsed_doc.to_string() == doc.to_string(), "Written and original documents don't match"
+
+        file_path.unlink()
+
     def test_write_kmz_file(self) -> None:
 
         doc = kml.KML(
@@ -236,10 +243,22 @@ def test_write_kmz_file(self) -> None:
 
         file_path = KMLFILEDIR / "output.kmz"
 
-        doc.write(file_path=file_path, prettyprint=True, xml_declaration=True)
+        doc.write(file_path=file_path, prettyprint=True, xml_declaration=False)
 
         assert file_path.is_file(), "KMZ file was not created."
 
+        tree = doc.to_string()
+
+        with zipfile.ZipFile(file_path, 'r') as kmz:
+          assert 'doc.kml' in kmz.namelist(), "doc.kml not found in the KMZ file"
+
+          with kmz.open('doc.kml') as doc_kml:
+              kml_content = doc_kml.read().decode("utf-8")
+
+              assert kml_content == tree, "KML content does not match expected content"
+
+        file_path.unlink()
+
 
 class TestLxml(Lxml, TestStdLibrary):
     """Test with lxml."""
diff --git a/tests/ogc_conformance/data/kml/output.kml b/tests/ogc_conformance/data/kml/output.kml
deleted file mode 100644
index 1bf68287..00000000
--- a/tests/ogc_conformance/data/kml/output.kml
+++ /dev/null
@@ -1,2 +0,0 @@
-<?xml version='1.0' encoding='UTF-8'?>
-<kml:kml xmlns:kml="http://www.opengis.net/kml/2.2"><kml:Document id="doc-001"><kml:name>Vestibulum eleifend lobortis lorem.</kml:name><kml:Placemark /></kml:Document></kml:kml>
\ No newline at end of file
diff --git a/tests/ogc_conformance/data/kml/output.kmz b/tests/ogc_conformance/data/kml/output.kmz
deleted file mode 100644
index bc737f2d..00000000
Binary files a/tests/ogc_conformance/data/kml/output.kmz and /dev/null differ