diff --git a/src/core/tiledmesh/qgscesiumtilesdataprovider.cpp b/src/core/tiledmesh/qgscesiumtilesdataprovider.cpp
index c84137810de7..01a44e65ed42 100644
--- a/src/core/tiledmesh/qgscesiumtilesdataprovider.cpp
+++ b/src/core/tiledmesh/qgscesiumtilesdataprovider.cpp
@@ -203,8 +203,7 @@ bool QgsCesiumTilesDataProvider::isValid() const
 {
   QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
-  // TODO
-  return true;
+  return mIsValid;
 }
 
 QString QgsCesiumTilesDataProvider::name() const
diff --git a/tests/src/python/CMakeLists.txt b/tests/src/python/CMakeLists.txt
index 1b7d98504151..67c0f7ce3b52 100644
--- a/tests/src/python/CMakeLists.txt
+++ b/tests/src/python/CMakeLists.txt
@@ -45,6 +45,7 @@ ADD_PYTHON_TEST(PyQgsBookmarkManager test_qgsbookmarkmanager.py)
 ADD_PYTHON_TEST(PyQgsBookmarkModel test_qgsbookmarkmodel.py)
 ADD_PYTHON_TEST(PyQgsBox3d test_qgsbox3d.py)
 ADD_PYTHON_TEST(PyQgsCategorizedSymbolRenderer test_qgscategorizedsymbolrenderer.py)
+ADD_PYTHON_TEST(PyQgsCesiumTiledMeshLayer test_qgscesiumtiledmeshlayer.py)
 ADD_PYTHON_TEST(PyQgsCesiumUtils test_qgscesiumutils.py)
 ADD_PYTHON_TEST(PyQgsCheckableComboBox test_qgscheckablecombobox.py)
 ADD_PYTHON_TEST(PyQgsClassificationMethod test_qgsclassificationmethod.py)
diff --git a/tests/src/python/test_qgscesiumtiledmeshlayer.py b/tests/src/python/test_qgscesiumtiledmeshlayer.py
new file mode 100644
index 000000000000..eeb951038138
--- /dev/null
+++ b/tests/src/python/test_qgscesiumtiledmeshlayer.py
@@ -0,0 +1,84 @@
+"""QGIS Unit tests for QgsCesiumTiledMeshLayer
+
+.. note:: This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+"""
+__author__ = 'Nyall Dawson'
+__date__ = '27/06/2023'
+__copyright__ = 'Copyright 2023, The QGIS Project'
+
+import os
+import tempfile
+
+import qgis  # NOQA
+from qgis.core import (
+    QgsTiledMeshLayer,
+    QgsCoordinateReferenceSystem
+)
+from qgis.testing import start_app, unittest
+from utilities import unitTestDataPath
+
+start_app()
+
+
+class TestQgsCesiumTiledMeshLayer(unittest.TestCase):
+
+    def test_invalid_source(self):
+        layer = QgsTiledMeshLayer('/nope/tileset.json', 'my layer',
+                                  'cesiumtiles')
+        self.assertFalse(layer.dataProvider().isValid())
+
+    def test_valid_source(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            tmp_file = os.path.join(temp_dir, 'tileset.json')
+            with open(tmp_file, 'wt', encoding='utf-8') as f:
+                f.write("""
+{
+  "asset": {
+    "version": "1.1",
+    "tilesetVersion": "e575c6f1"
+  },
+  "geometricError": 100,
+  "root": {
+    "boundingVolume": {
+      "region": [
+        -1.3197209591796106,
+        0.6988424218,
+        -1.3196390408203893,
+        0.6989055782,
+        1.2,
+        67.00999999999999
+      ]
+    },
+    "geometricError": 100,
+    "refine": "ADD",
+    "children": []
+  }
+}""")
+
+            layer = QgsTiledMeshLayer(tmp_file, 'my layer',
+                                      'cesiumtiles')
+            self.assertTrue(layer.dataProvider().isValid())
+
+            self.assertEqual(layer.dataProvider().crs(),
+                             QgsCoordinateReferenceSystem('EPSG:4979'))
+
+            self.assertAlmostEqual(layer.dataProvider().extent().xMinimum(),
+                                   -75.61444109, 3)
+            self.assertAlmostEqual(layer.dataProvider().extent().xMaximum(),
+                                   -75.60974751, 3)
+            self.assertAlmostEqual(layer.dataProvider().extent().yMinimum(),
+                                   40.04072131, 3)
+            self.assertAlmostEqual(layer.dataProvider().extent().yMaximum(),
+                                   40.044339909, 3)
+
+            # check that version, tileset version, and z range are in html metadata
+            self.assertIn('1.1', layer.dataProvider().htmlMetadata())
+            self.assertIn('e575c6f1', layer.dataProvider().htmlMetadata())
+            self.assertIn('1.2 - 67.01', layer.dataProvider().htmlMetadata())
+
+
+if __name__ == '__main__':
+    unittest.main()