smarter caching of test files

features/step_definitions/locate.rb

@@ -1,7 +1,7 @@
 When /^I request locate I should get$/ do |table|
   reprocess
   actual = []
-  OSRMLoader.load(self,"#{@osm_file}.osrm") do
+  OSRMLoader.load(self,"#{prepared_file}.osrm") do
     table.hashes.each_with_index do |row,ri|
       in_node = find_node_by_name row['in']
       raise "*** unknown in-node '#{row['in']}" unless in_node

features/step_definitions/nearest.rb

@@ -1,7 +1,7 @@
 When /^I request nearest I should get$/ do |table|
   reprocess
   actual = []
-  OSRMLoader.load(self,"#{@osm_file}.osrm") do
+  OSRMLoader.load(self,"#{prepared_file}.osrm") do
     table.hashes.each_with_index do |row,ri|
       in_node = find_node_by_name row['in']
       raise "*** unknown in-node '#{row['in']}" unless in_node

features/step_definitions/requests.rb

@@ -1,6 +1,6 @@
 When /^I request \/(.*)$/ do |path|
   reprocess
-  OSRMLoader.load(self,"#{@osm_file}.osrm") do
+  OSRMLoader.load(self,"#{prepared_file}.osrm") do
     @response = request_path path
   end
 end

features/step_definitions/routability.rb

@@ -44,7 +44,7 @@ Then /^routability should be$/ do |table|
   if table.headers&["forw","backw","bothw"] == []
     raise "*** routability tabel must contain either 'forw', 'backw' or 'bothw' column"
   end
-  OSRMLoader.load(self,"#{@osm_file}.osrm") do
+  OSRMLoader.load(self,"#{prepared_file}.osrm") do
     table.hashes.each_with_index do |row,i|
       output_row = row.dup
       attempts = []

features/step_definitions/routing.rb

@@ -1,7 +1,7 @@
 When /^I route I should get$/ do |table|
   reprocess
   actual = []
-  OSRMLoader.load(self,"#{@osm_file}.osrm") do
+  OSRMLoader.load(self,"#{prepared_file}.osrm") do
     table.hashes.each_with_index do |row,ri|
       if row['request']
         got = {'request' => row['request'] }