Fix various issues and add improved test for dependency resolution

test/dummy/app/helpers/LogicUnitReceiver.rb

@@ -2,7 +2,7 @@ class LogicUnitReceiver
   include Laradi::Mixin
 
   def get_unit
-    dependencies :logic_unit
+    dependencies(:logic_unit) => {logic_unit:}
 
     logic_unit
   end

test/laradi_test.rb

@@ -14,7 +14,11 @@ class LaradiTest < ActiveSupport::TestCase
   test "It can inject dependencies" do
     lur = LogicUnitReceiver.new
 
-    assert_not_nil lur.get_unit
+    result = lur.get_unit
+
+    assert_not_nil result
+
+    assert_kind_of(LogicUnit, result)
   end
 
 end