Add `TomTom` class to communicate with their API

Provides an interface to communicate with the TomTom API. Currently
includes a method `#batch` to make a batch routing request
(https://developer.tomtom.com/online-routing/online-routing-documentation/batch-routing).

Left a bunch of development-related code in just to preserve my
in-progress stages. Originally I was told to use the matrix routing API,
but that turned out to not match what we wanted. Namely, matrix routing
would produce a table with every point routed with every other point. We
instead want routes of each segment in a line, in order (or, just the
diagonal of the matrix). Using the batch API allows us to get the routes
we need without doing unnecessary work.

Update the `WayCost` class to provide `departure` and `arrival` methods
as readers, and make `id` an optional parameter for now. (We still need
to figure out how we're dealing with ID.)

Refs #6095

1 files changed, 25 insertions, 0 deletions

diff --git a/spec/lib/tom_tom_spec.rb b/spec/lib/tom_tom_spec.rb
new file mode 100644
index 000000000..57f22d26a
--- /dev/null
+++ b/spec/lib/tom_tom_spec.rb
@@ -0,0 +1,25 @@
+RSpec.describe TomTom do
+  let(:tomtom) { TomTom.new }
+
+  describe "#convert_way_costs_for_batch" do
+    it "turns WayCost points into a collection of colon-separated strings" do
+      way_costs = [
+        WayCost.new(
+          departure: Geokit::LatLng.new(2, 48),
+          arrival: Geokit::LatLng.new(3, 46)
+        ),
+        WayCost.new(
+          departure: Geokit::LatLng.new(-71, 42),
+          arrival: Geokit::LatLng.new(-71.5, 42.9)
+        )
+      ]
+
+      expect(
+        tomtom.convert_way_costs_for_batch(way_costs)
+      ).to eq([
+        '2,48:3,46',
+        '-71,42:-71.5,42.9'
+      ])
+    end
+  end
+end