diff --git a/data_logging/tests/data/valid_log.json b/data_logging/tests/data/valid_log.json
new file mode 100644
index 0000000..3bace28
--- /dev/null
+++ b/data_logging/tests/data/valid_log.json
@@ -0,0 +1,26 @@
+[
+  {
+    "timestamp": "2024-06-05T22:15:00Z",
+    "temperature": 18.7,
+    "wind_speed": 2.5,
+    "error_rate": 1.2
+  },
+  {
+    "timestamp": "2024-06-05T22:30:00Z",
+    "temperature": 18.4,
+    "wind_speed": 2.7,
+    "error_rate": 1.0
+  },
+  {
+    "timestamp": "2024-06-05T22:45:00Z",
+    "temperature": 18.1,
+    "wind_speed": 2.9,
+    "error_rate": 0.8
+  },
+  {
+    "timestamp": "2024-06-05T23:00:00Z",
+    "temperature": 17.8,
+    "wind_speed": 3.0,
+    "error_rate": 1.4
+  }
+]
\ No newline at end of file