some utils and tests

xexe/utils.py

@@ -1,4 +1,8 @@
 import datetime
+from itertools import combinations
+from typing import Set
+
+from money.currency import Currency
 
 
 class DateRange:
@@ -55,3 +59,31 @@ class DateRange:
 
     def __repr__(self) -> str:
         return f"""Date Range: {self.start_date.strftime("%Y-%m-%d")} to {self.end_date.strftime("%Y-%m-%d")}."""
+
+    def __iter__(self):
+        current_date = self.start_date
+        while current_date <= self.end_date:
+            yield current_date
+            current_date += datetime.timedelta(days=1)
+
+
+def generate_currency_and_dates_combinations(
+    date_range: DateRange, currencies: Set[Currency]
+):
+    currency_pairs = list(combinations(currencies, 2))
+
+    combinations = []
+    for date in date_range:
+        for from_currency, to_currency in currency_pairs:
+            combinations.append(
+                {
+                    "from_currency": from_currency,
+                    "to_currency": to_currency,
+                    "date": date,
+                }
+            )
+
+    combinations = tuple(combinations)
+
+    # Convert the result to a tuple
+    return combinations