TST: Add unit test for record creation

src/doc/cfood.rst

@@ -167,9 +167,9 @@ following.
    ValueWithUnitElt:
      type: TextElement
      match_name: ^my_prop$
-     match_value: "^(?P<number>\d+\.?\d*)\s+(?P<unit>.+)"  # Extract value and unit from a string which
-							   # has a number followed by at least one whitespace
-							   # character followed by a unit.
+     match_value: "^(?P<number>\\d+\\.?\\d*)\s+(?P<unit>.+)"  # Extract value and unit from a string which
+							      # has a number followed by at least one whitespace
+							      # character followed by a unit.
      records:
        MyRecord:
 	 MyProp:

unittests/test_scanner.py

@@ -316,3 +316,57 @@ def test_record_parents():
             assert rec.parents[0].name == 'Stuff'  # default parent stays if no parent is given on
             # lower levels
             assert len(rec.parents) == 1
+
+
+def test_units():
+    """Test the correct setting of units."""
+    crawler_definition = load_definition(UNITTESTDIR / "test_unit_cfood.yml")
+    converter_registry = create_converter_registry(crawler_definition)
+
+    data = {
+        "value_with_unit": "1.1 m",
+        "array_with_units": [
+            "1.1 cm",
+            "2.2 cm"
+        ]
+    }
+    records = scan_structure_elements(DictElement(name="", value=data), crawler_definition,
+                                      converter_registry)
+    assert len(records) == 1
+    rec = records[0]
+    # This is hard-coded in cfood:
+    assert rec.get_property("may_be_overwritten") is not None
+    assert rec.get_property("may_be_overwritten").value == "12"
+    assert rec.get_property("may_be_overwritten").unit == "K"
+    # Those are set from data
+    assert rec.get_property("value_with_unit") is not None
+    assert rec.get_property("value_with_unit").value == "1.1"
+    assert rec.get_property("value_with_unit").unit == "m"
+    assert rec.get_property("list_with_unit") is not None
+    assert rec.get_property("list_with_unit").value == ["1.1", "2.2"]
+    assert rec.get_property("list_with_unit").unit == "cm"
+
+    # Contradictory units
+    data = {
+        "array_with_units": [
+            "1.1 K",
+            "45 W"
+        ]
+    }
+    with raises(RuntimeError) as rte:
+        records = scan_structure_elements(DictElement(name="", value=data), crawler_definition,
+                                          converter_registry)
+    assert "Property 'list_with_unit' has contradictory units" in str(rte.value)
+
+    # Overwrite value and unit
+    data = {
+        "may_be_overwritten": "400 °C"
+    }
+    records = scan_structure_elements(DictElement(name="", value=data), crawler_definition,
+                                      converter_registry)
+    assert len(records) == 1
+    rec = records[0]
+    # Now set from data
+    assert rec.get_property("may_be_overwritten") is not None
+    assert rec.get_property("may_be_overwritten").value == "400"
+    assert rec.get_property("may_be_overwritten").unit == "°C"