feat: add test for text -> currency value

features/currency.feature

@@ -15,3 +15,21 @@ Feature: Represent real currency
 			| USD-cents    | 10071      | $100.71       |
 			| USD-cents    | 110071     | $1,100.71     |
 			| USD-cents    | 500110071  | $5,001,100.71 |
+
+	Scenario Outline: Parse text to currency
+		Given currency text representation <repr>
+		When currency text representation is parsed
+		Then the resulting currency object has value <value>
+
+		Examples: USD
+			|    repr |    value |
+			|   $1.00 |      100 |
+			|    $1.0 |      100 |
+			|     $1. |      100 |
+			|      $1 |      100 |
+			|     $.5 |       50 |
+			|    $0.5 |       50 |
+			|   $0.50 |       50 |
+			|    $100 |    10000 |
+			|   $1000 |   100000 |
+			|  $1,000 |   100000 |

features/steps/currency.py

@@ -21,3 +21,18 @@ def _(context):
 @then('it matches {pattern}')
 def _(context, pattern: str):
     assert context.string == pattern, f"'{context.string}' != '{pattern}'"
+
+
+@given("currency text representation {repr}")
+def _(context, repr: str):
+    context.repr = repr
+
+
+@when("currency text representation is parsed")
+def _(context):
+    context.currency = Currency(value=USD.toValue(context.repr), format=USD)
+
+
+@then("the resulting currency object has value {value}")
+def _(context, value: int):
+    assert context.currency.value == value, f"{context.currency.value} != {value}"

src/ddd_sample/domain/currency.py

@@ -1,11 +1,32 @@
-from typing import Callable
+import re
+from abc import ABC, abstractclassmethod
 
 
-CurrencyFormatMixin = Callable[[int], str]
+class CurrencyFormatMixin(ABC):
+    @abstractclassmethod
+    def toValue(cls, repr: str) -> int:
+        pass
 
+    @abstractclassmethod
+    def toString(cls, value: int) -> str:
+        pass
 
-def USD(value: int) -> str:
-    return "${:,}.{:02d}".format(value // 100, value % 100)
+
+class USD(CurrencyFormatMixin):
+    @abstractclassmethod
+    def toValue(cls, repr: str) -> int:
+        repr = repr.strip()
+        repr = repr.replace(",", "")
+        match = re.search(r"^\$(\d*)\.?(\d?\d?)$", repr)
+        print(match.groups())
+#        dollars = int(match.group(1))
+#        cents = int(match.group(2))
+
+        return 0#dollars * 100 + cents
+
+    @abstractclassmethod
+    def toString(cls, value: int) -> str:
+        return "${:,}.{:02d}".format(value // 100, value % 100)
 
 
 class Currency:
@@ -15,4 +36,4 @@ def __init__(self, value: int, format: CurrencyFormatMixin):
         self.format = format
 
     def __str__(self) -> str:
-        return self.format(self.value)
+        return self.format.toString(self.value)