Add first test for value parser

tests/parsers_test.py

@@ -1,6 +1,7 @@
 import pytest
 
 from api import parsers
+from domain.value import Value
 
 
 class TestNameParser:
@@ -54,3 +55,37 @@ def test_strips_invalid_chars(self, name: str, expected: str):
     def test_empty_name_fails(self, name):
         with pytest.raises(ValueError):
             parsers.parse_name(name)
+
+
+class TestValueParser:
+
+    @pytest.mark.parametrize(
+        "value, expected",
+        [
+            # plain numbers
+            ("012", Value(12.0, min_exponent=0)),
+            ("12", Value(12.0, min_exponent=0)),
+            ("-42", Value(-42.0, min_exponent=0)),
+            ("10050", Value(10050, min_exponent=0)),
+            # plain numbers scientific
+            ("13e3", Value(13000.0, min_exponent=3)),
+            # plain decimal
+            ("3.1415", Value(3.1415, min_exponent=-4)),
+            ("0.005", Value(0.005, min_exponent=-3)),
+            ("0.010", Value(0.01, min_exponent=-3)),
+            # decimal & scientific
+            ("3.1415e3", Value(3141.5, min_exponent=-1)),
+            ("2.71828e2", Value(271.828, min_exponent=-3)),
+            ("2.5e-1", Value(0.25, min_exponent=-2)),
+            ("0.1e2", Value(10.0, min_exponent=1)),
+            ("1.2e5", Value(120000.0, min_exponent=4)),
+            ("1.20e5", Value(120000.0, min_exponent=3)),
+            ("103.1570e-30", Value(0.0000000000000000000000000001031570, min_exponent=-34)),
+        ],
+    )
+    def test_parse_exact_value(self, value: str, expected: Value):
+        v = parsers.parse_exact_value(value)
+        # pylint: disable=protected-access
+        assert v._value == expected._value
+        assert v._min_exponent == expected._min_exponent
+        # pylint: enable=protected-access