feat(conftest): patch metadata return value

this will prevent cassettes to be invalidated due to the metadata end_timestamp changing

Addresses #139

ohsome/test/conftest.py

@@ -2,27 +2,74 @@
 # -*- coding: utf-8 -*-
 """Conftest for shared pytest fixtures"""
 import logging
+from unittest.mock import patch, PropertyMock
+
 import pytest
+from urllib3 import Retry
+
 import ohsome
 
 logger = logging.getLogger(__name__)
 
 
+@pytest.fixture
+def mocked_metadata():
+    """A default metadata dictionary.
+
+    @return:
+    """
+    return {
+        "attribution": {
+            "url": "https://ohsome.org/copyrights",
+            "text": "© OpenStreetMap contributors",
+        },
+        "apiVersion": "1.10.1",
+        "timeout": 600.0,
+        "extractRegion": {
+            "spatialExtent": {
+                "type": "Polygon",
+                "coordinates": [
+                    [
+                        [-180.0, -90.0],
+                        [180.0, -90.0],
+                        [180.0, 90.0],
+                        [-180.0, 90.0],
+                        [-180.0, -90.0],
+                    ]
+                ],
+            },
+            "temporalExtent": {
+                "fromTimestamp": "2007-10-08T00:00:00Z",
+                "toTimestamp": "2023-11-25T13:00:00Z",
+            },
+            "replicationSequenceNumber": 99919,
+        },
+    }
+
+
 @pytest.fixture
 def base_client(mocked_metadata, tmpdir_factory):
     """Session-wide test client."""
     temp_directory = tmpdir_factory.mktemp("base_client").mkdir("logs").strpath
-    client = ohsome.OhsomeClient(log_dir=temp_directory)
-    assert client.metadata  # call metadata once to ensure it is cached
-    yield client
+    with patch(
+        "ohsome.clients._OhsomeInfoClient.metadata",
+        new_callable=PropertyMock,
+        return_value=mocked_metadata,
+    ):
+        client = ohsome.OhsomeClient(log_dir=temp_directory)
+        yield client
 
 
 @pytest.fixture
 def base_client_without_log(mocked_metadata):
     """Session-wide test client."""
-    client = ohsome.OhsomeClient(log=False)
-    assert client.metadata  # call metadata once to ensure it is cached
-    yield client
+    with patch(
+        "ohsome.clients._OhsomeInfoClient.metadata",
+        new_callable=PropertyMock,
+        return_value=mocked_metadata,
+    ):
+        client = ohsome.OhsomeClient(log=False)
+        yield client
 
 
 @pytest.fixture