Project skeleton

tests/test_units.py

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+import pytest
+
+from pv_microinverter.units import Dimension, SIUnit
+
+
+def test_siunit_parse_base_unit():
+    unit = SIUnit.parse("W")
+    # Check that parsing base unit returns the registered unit
+    assert unit.name == "Watt"
+    assert unit.symbol == "W"
+    assert unit.factor == 1
+
+
+def test_siunit_parse_prefixed_unit():
+    unit = SIUnit.parse("kW")
+    # The expected unit is created by prefix "k" and the base unit "Watt"
+    assert unit.name == "kWatt"
+    assert unit.symbol == "kW"
+    assert unit.factor == 1000  # 1e3 multiplier
+
+
+def test_dimension_parse_valid():
+    # Parsing a valid dimension string should succeed
+    dim = Dimension.parse("3.5 kW")
+    assert dim.value == "3.5"
+    # Check unit attributes from SIUnit.parse
+    assert dim.unit.name == "kWatt"
+    assert dim.unit.symbol == "kW"
+    # Check conversion to base unit: 3.5 * 1000 = 3500.0
+    assert dim.to_base_unit() == 3500.0
+
+
+def test_dimension_parse_invalid_format():
+    # Missing space between value and unit should raise a ValueError
+    with pytest.raises(ValueError):
+        Dimension.parse("3.5kW")
+
+
+def test_siunit_parse_unknown_unit():
+    # Attempting to parse an unknown unit should raise a ValueError
+    with pytest.raises(ValueError):
+        SIUnit.parse("invalid")