Test for fare attribetes read & write.

include/just_gtfs/just_gtfs.h

@@ -999,6 +999,15 @@ struct FareAttributesItem
   size_t transfer_duration = 0;  // Length of time in seconds before a transfer expires
 };
 
+
+inline bool operator==(const FareAttributesItem & lhs, const FareAttributesItem & rhs)
+{
+  return std::tie(lhs.fare_id, lhs.price, lhs.currency_type, lhs.payment_method,
+                  lhs.transfers, lhs.agency_id, lhs.transfer_duration) ==
+      std::tie(rhs.fare_id, rhs.price, rhs.currency_type, rhs.payment_method,
+               rhs.transfers, rhs.agency_id, rhs.transfer_duration);
+}
+
 // Optional dataset file
 struct FareRule
 {

tests/unit_tests.cpp

@@ -519,6 +519,11 @@ TEST_CASE("Fare attributes")
   const auto & attributes_for_id = feed.get_fare_attributes("a");
   REQUIRE_EQ(attributes_for_id.size(), 1);
   CHECK_EQ(attributes_for_id[0].price, 5.25);
+
+  REQUIRE_EQ(feed.write_fare_attributes("data/output_feed"), ResultCode::OK);
+  Feed feed_copy("data/output_feed");
+  REQUIRE_EQ(feed_copy.read_fare_attributes(), ResultCode::OK);
+  CHECK_EQ(attributes, feed_copy.get_fare_attributes());
 }
 
 TEST_CASE("Fare rules")