From be51d20a2b5a17dca42db8a883f6518e01bf94f5 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Sun, 8 Feb 2026 03:06:30 +0000
Subject: [PATCH] Add data_logger/tests/test_core.py

---
 data_logger/tests/test_core.py | 59 ++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 data_logger/tests/test_core.py

diff --git a/data_logger/tests/test_core.py b/data_logger/tests/test_core.py
new file mode 100644
index 0000000..985c52e
--- /dev/null
+++ b/data_logger/tests/test_core.py
@@ -0,0 +1,59 @@
+import csv
+import tempfile
+from pathlib import Path
+import pytest
+
+from data_logger import core
+
+
+def make_sample_data():
+    return [
+        core.SensorData('2024-01-01T12:00:00', 23.5, 0.12, 45.0),
+        core.SensorData('2024-01-01T12:01:00', 24.0, 0.10, 46.5)
+    ]
+
+
+def test_sensor_data_initialization():
+    data = core.SensorData('2024-01-01T12:00:00', 22.1, 0.15, 50.0)
+    assert data.timestamp == '2024-01-01T12:00:00'
+    assert isinstance(data.temperature, float)
+    assert isinstance(data.vibration_amplitude, float)
+    assert isinstance(data.humidity, float)
+
+
+def test_log_sensor_data_creates_csv():
+    data_list = make_sample_data()
+    tmpdir = Path(tempfile.mkdtemp())
+    output_path = tmpdir / 'logged_data.csv'
+
+    # call function
+    csv_path = core.log_sensor_data(data_list)
+
+    assert isinstance(csv_path, str)
+    out_file = Path(csv_path)
+    assert out_file.exists()
+
+    # check CSV content
+    with out_file.open('r', newline='') as f:
+        reader = csv.DictReader(f)
+        rows = list(reader)
+
+    assert len(rows) == len(data_list)
+    for i, row in enumerate(rows):
+        assert set(row.keys()) == {'timestamp', 'temperature', 'vibration_amplitude', 'humidity'}
+        assert float(row['temperature']) == pytest.approx(data_list[i].temperature, rel=1e-6)
+        assert float(row['vibration_amplitude']) == pytest.approx(data_list[i].vibration_amplitude, rel=1e-6)
+        assert float(row['humidity']) == pytest.approx(data_list[i].humidity, rel=1e-6)
+
+
+def test_log_sensor_data_empty_list(tmp_path):
+    with pytest.raises((AssertionError, ValueError, TypeError)):
+        core.log_sensor_data([])
+
+
+def test_invalid_sensor_data_type(tmp_path):
+    invalid_data = [
+        {'timestamp': '2024-01-01T12:00:00', 'temperature': 22.0, 'vibration_amplitude': 0.1, 'humidity': 40.0}
+    ]
+    with pytest.raises((AssertionError, AttributeError, TypeError)):
+        core.log_sensor_data(invalid_data)
\ No newline at end of file