diff --git a/artifact.001/tests/test_core.py b/artifact.001/tests/test_core.py
new file mode 100644
index 0000000..cd29f65
--- /dev/null
+++ b/artifact.001/tests/test_core.py
@@ -0,0 +1,71 @@
+import json
+import os
+from pathlib import Path
+import pytest
+
+# We assume the code under test is in src/artifact_001/core.py
+import sys
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'src'))
+
+from artifact_001 import core
+
+@pytest.fixture
+def sample_meteor_event():
+    return core.MeteorEvent(timestamp='2024-06-01T23:59:59', intensity=2.5, exposure_time=500.0)
+
+
+def test_capture_meteors_returns_list_of_meteorevent(monkeypatch):
+    # Simulate a deterministic set of meteor events
+    def fake_now():
+        from datetime import datetime
+        return datetime(2024, 1, 1, 0, 0, 0)
+
+    from datetime import datetime
+    monkeypatch.setattr(core.datetime, 'datetime', type('FakeDatetime', (), {'now': staticmethod(fake_now)}))
+
+    events = core.capture_meteors(500.0)
+    assert isinstance(events, list)
+    assert all(isinstance(e, core.MeteorEvent) for e in events)
+    assert all(e.exposure_time == 500.0 for e in events)
+    assert all(hasattr(e, 'timestamp') and hasattr(e, 'intensity') for e in events)
+
+
+def test_log_data_creates_json_file(tmp_path, sample_meteor_event):
+    test_file = tmp_path / 'meteor_events.json'
+    data = [sample_meteor_event]
+
+    # Patch output path in core module
+    monkey_output = tmp_path / 'meteor_events.json'
+    core.LOG_OUTPUT_PATH = monkey_output
+
+    # Log data
+    core.log_data(data)
+
+    assert monkey_output.exists()
+    with open(monkey_output, 'r', encoding='utf-8') as f:
+        content = json.load(f)
+        assert isinstance(content, list)
+        assert all(isinstance(item, dict) for item in content)
+        assert content[0]['exposure_time'] == pytest.approx(500.0)
+        assert 'timestamp' in content[0]
+        assert 'intensity' in content[0]
+
+
+def test_log_data_with_empty_list(tmp_path):
+    monkey_output = tmp_path / 'empty.json'
+    core.LOG_OUTPUT_PATH = monkey_output
+    core.log_data([])
+    assert monkey_output.exists()
+    with open(monkey_output, 'r', encoding='utf-8') as f:
+        content = json.load(f)
+        assert content == []
+
+
+def test_meteor_event_fields(sample_meteor_event):
+    event = sample_meteor_event
+    assert isinstance(event.timestamp, str)
+    assert isinstance(event.intensity, float)
+    assert isinstance(event.exposure_time, float)
+    # Integrity check
+    assert event.intensity > 0
+    assert event.exposure_time > 0
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