Changes the implicit dependencies an Adapter has

Before, an adapter assumed that an object responds to #lat and #lng.
Now, an adapter assumes that an object responds to #[](key), where key
is :lat or :lng.

lib/routing/adapter/rest_adapter.rb

@@ -52,7 +52,14 @@ def parse(response)
       end
 
       def convert_geo_points_to_params(geo_points)
-        Hash[geo_points.each_with_index.map { |point, i| [ "waypoint#{i}", "geo!#{point.fetch(:lat)},#{point.fetch(:lng)}" ] }]
+        Hash[geo_points.each_with_index.map do |point, i|
+          lat = point[:lat]
+          lng = point[:lng]
+
+          raise ArgumentError, "latitude or longitude missing" unless lat && lng
+
+          ["waypoint#{i}", "geo!#{lat},#{lng}"]
+        end]
       end
     end
   end

lib/routing/adapter/test.rb

@@ -7,11 +7,16 @@ class Test
 
       def calculate(geo_points)
         geo_points.collect do |point|
+          lat = point[:lat]
+          lng = point[:lng]
+
+          raise ArgumentError, "latitude or longitude missing" unless lat && lng
+
           GeoPoint.new(
-            :lat => point.lat,
-            :lng => point.lng,
-            :original_lat => point.lat,
-            :original_lng => point.lng,
+            :lat => lat,
+            :lng => lng,
+            :original_lat => lat,
+            :original_lng => lng,
             :relative_time => 100,
             :distance => 100,
             :waypoint => true
@@ -21,4 +26,4 @@ def calculate(geo_points)
     end
 
   end
-end
+end

spec/routing/adapter/test_spec.rb

@@ -8,7 +8,14 @@
   end
 
   describe '#calculate' do
-    let(:geo_points) { [double(lat: 1, lng: 2), double(lat: 3, lng: 4), double(lat: 5, lng: 6)] }
+    let(:geo_points) do
+      [
+        Routing::GeoPoint.new(lat: 1, lng: 2),
+        Routing::GeoPoint.new(lat: 3, lng: 4),
+        Routing::GeoPoint.new(lat: 5, lng: 6)
+      ]
+    end
+
 
     it 'returns an array of geopoints with values that are passed to the method' do
       subject.calculate(geo_points).each_with_index do |new_geo_point, index|