implement equality

tests/tests_unit/test_currency_pair.py

@@ -20,7 +20,7 @@ def test_create_currency_pair_with_same_currency_works():
     assert (same_curr_pair.from_currency == "USD", same_curr_pair.to_currency == "USD")
 
 
-def test_reverse_currency_works_fine():
+def test_reverse_pair_works_fine():
 
     a_pair: CurrencyPair = CurrencyPair(
         from_currency=Currency["USD"], to_currency=Currency["EUR"]
@@ -33,3 +33,14 @@ def test_reverse_currency_works_fine():
         reverse_pair.from_currency == "EUR",
         reverse_pair.to_currency == "USD",
     )
+
+
+def test_pair_equality_works():
+
+    a_pair: CurrencyPair = CurrencyPair(
+        from_currency=Currency["USD"], to_currency=Currency["EUR"]
+    )
+
+    reverse_pair: CurrencyPair = a_pair.get_reverse_pair()
+
+    assert a_pair == a_pair and a_pair != reverse_pair

xexe/currency_pair.py

@@ -10,10 +10,15 @@ class CurrencyPair:
         self.from_currency = from_currency
         self.to_currency = to_currency
 
-    def __str__(self):
-        return str(self.from_currency) + str(self.to_currency)
-
     def get_reverse_pair(self) -> "CurrencyPair":
         return CurrencyPair(
             from_currency=self.to_currency, to_currency=self.from_currency
         )
+
+    def __str__(self):
+        return str(self.from_currency) + str(self.to_currency)
+
+    def __eq__(self, other: "CurrencyPair") -> bool:
+        return (self.from_currency == other.from_currency) and (
+            self.to_currency == other.to_currency
+        )