TomTom::Batch: Extract code to `#extract_costs_to_way_costs!`

Extract some code from `#batch` to allow us to test the part that takes
distance and time values from the response JSON and put fill them into
`WayCost`s.

In order for the test to work, had to add an `#==` method to `WayCost`
and make `distance` and `time` accessors.

The JSON file fixture is a copy of a response from the TomTom `/batch`
API. The file is pretty big. I'm not sure if maybe I should condense it
for the sake of test performance.

Refs #6095

1 files changed, 7 insertions, 2 deletions

diff --git a/lib/tom_tom/batch.rb b/lib/tom_tom/batch.rb
index 913f018b5..6ceb9c226 100644
--- a/lib/tom_tom/batch.rb
+++ b/lib/tom_tom/batch.rb
@@ -23,9 +23,14 @@ module TomTom
         }.to_json
       end
 
-      response = JSON.parse(response.body)
+      extract_costs_to_way_costs!(
+        way_costs,
+        JSON.parse(response.body)
+      )
+    end
 
-      calculated_routes = response['batchItems']
+    def extract_costs_to_way_costs!(way_costs, batch_json)
+      calculated_routes = batch_json['batchItems']
       calculated_routes.each_with_index do |route, i|
         next if route['statusCode'] != 200