fix(converter): Update unit-type converted to support '%'

ph_units/converter.py

@@ -37,11 +37,14 @@ def _standardize_unit_name(_input, _unit_type_alias_dict):
     try:
         input_unit = _unit_type_alias_dict[_input_string]
     except KeyError:
-        raise UnitTypeNameNotFound(
-            "\n\tI do not know how to understand the input unit: '{}'?\nValid formats include: {}".format(
-                _input_string, sorted(_unit_type_alias_dict.keys())
+        if _input_string == "%":
+            input_unit = "%"
+        else:
+            raise UnitTypeNameNotFound(
+                "\n\tI do not know how to understand the input unit: '{}'?\nValid formats include: {}".format(
+                    _input_string, sorted(_unit_type_alias_dict.keys())
+                )
             )
-        )
 
     return input_unit
 

tests/test_converter.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# -*- Python Version: 2.7 -*-
+import pytest
+from ph_units.converter import _standardize_unit_name, unit_type_dict, unit_type_alias_dict, UnitTypeNameNotFound
+
+
+def test_standardize_unit_name_simple() -> None:
+    assert _standardize_unit_name("FT", unit_type_alias_dict) == "FT"
+    assert _standardize_unit_name("FT", unit_type_alias_dict) == "FT"
+
+def test_standardize_unit_name_percent() -> None:
+    assert _standardize_unit_name("%", unit_type_alias_dict) == "%"
+
+def test_standardize_unit_name_alias() -> None:
+    assert _standardize_unit_name("FT3/M", unit_type_alias_dict) == "CFM"
+    assert _standardize_unit_name("CFM", unit_type_alias_dict) == "CFM"
+
+def test_standardize_gives_error() -> None:
+    with pytest.raises(UnitTypeNameNotFound):
+        _standardize_unit_name("Not/A-Unit", unit_type_alias_dict)

tests/test_unit_type.py

@@ -8,6 +8,18 @@ def test_default_Unit():
     assert u.value == 0.0
     assert u.unit == "-"
 
+def test_percent_Unit():
+    u = Unit(1.0, "%")
+    assert u.value == 1.0
+    assert u.unit == "%"
+
+
+def test_add_percent_unit():   
+    u1 = Unit(1.0, "%")
+    u2 = Unit(1.0, "%")
+    u3 = u1 + u2
+    assert u3.value == 2.0
+    assert u3.unit == "%"
 
 def test_Unit_is_frozen():
     u = Unit()