align noop behavior to better match tracker

lib/staccato/tracker.rb

@@ -174,13 +174,11 @@ def adapter
   #   Useful in testing
   class NoopTracker
     attr_writer :adapter
-    # (see Tracker#initialize)
-    def initialize(id = nil, client_id = nil, hit_defaults = {}); end
+    attr_accessor :hit_defaults
 
-    # hit defaults for our noop
-    # @return [Hash]
-    def hit_defaults
-      {}
+    # (see Tracker#initialize)
+    def initialize(id = nil, client_id = nil, hit_defaults = {})
+      self.hit_defaults = hit_defaults
     end
 
     # (see Tracker#id)

spec/integration/noop_tracker_spec.rb

@@ -20,6 +20,20 @@
     end
   end
 
+  describe 'settings' do
+    it 'has an adapter' do
+      expect(tracker.respond_to?(:adapter=)).to eq(true)
+    end
+
+    it 'has hit defaults' do
+      expect(tracker.hit_defaults).to eq({})
+
+      tracker.hit_defaults[:document_hostname] = 'mysite.com'
+
+      expect(tracker.hit_defaults[:document_hostname]).to eq 'mysite.com'
+    end
+  end
+
   describe "#event" do
     before(:each) do
       tracker.event({