feat: initialize data-layer project skeleton

tests/test_domain.py

@@ -0,0 +1,59 @@
+from datetime import UTC, datetime
+
+import pytest
+from pydantic import ValidationError
+
+from lmpm.domain.experiment import ExperimentRecord, ProcessingParams, QualityMetrics
+from lmpm.domain.material import MaterialProperty
+
+
+def material_property():
+    return MaterialProperty(
+        material_id="acrylic-001",
+        name="Clear Acrylic",
+        category="polymer",
+        reflectivity=0.08,
+        absorptivity=0.92,
+        melting_point_c=160.0,
+        thermal_conductivity_w_m_k=0.19,
+        density_g_cm3=1.18,
+        roughness_um=1.2,
+    )
+
+
+def test_material_property_accepts_valid_values():
+    material = material_property()
+
+    assert material.material_id == "acrylic-001"
+    assert material.absorptivity == pytest.approx(0.92)
+
+
+@pytest.mark.parametrize(
+    ("field", "value"),
+    [("reflectivity", -0.1), ("absorptivity", 1.1), ("density_g_cm3", 0)],
+)
+def test_material_property_rejects_out_of_range_values(field, value):
+    data = material_property().model_dump()
+    data[field] = value
+
+    with pytest.raises(ValidationError):
+        MaterialProperty.model_validate(data)
+
+
+def test_experiment_record_round_trips_nested_models():
+    experiment = ExperimentRecord(
+        experiment_id=1,
+        material_id="acrylic-001",
+        params=ProcessingParams(
+            power_percent=45,
+            scan_speed_mm_s=80,
+            pulse_frequency_hz=20,
+        ),
+        metrics=QualityMetrics(kerf_width_mm=0.18),
+        recorded_at=datetime.now(UTC),
+    )
+
+    dumped = experiment.model_dump()
+    restored = ExperimentRecord.model_validate(dumped)
+
+    assert restored == experiment