diff --git a/lib/laradi.rb b/lib/laradi.rb
index e614bdc..0c8bcfa 100644
--- a/lib/laradi.rb
+++ b/lib/laradi.rb
@@ -8,9 +8,16 @@ module Laradi
 
   module Mixin
     def dependencies(*deps)
+      result = {}
       deps.each { |dep|
-        include $laradi_injector[dep]
+        instance = $laradi_injector[dep]
+        if instance.nil?
+          raise NoDependencyError, "No dependency found for #{dep}"
+        end
+        result[dep] = instance
       }
+
+      result
     end
   end
 
diff --git a/lib/laradi/exceptions.rb b/lib/laradi/exceptions.rb
new file mode 100644
index 0000000..5ffc62c
--- /dev/null
+++ b/lib/laradi/exceptions.rb
@@ -0,0 +1,9 @@
+module Laradi
+
+  module Exceptions
+    class NoDependencyError < Exception
+
+    end
+  end
+
+end
\ No newline at end of file
diff --git a/test/dummy/app/helpers/LogicUnitReceiver.rb b/test/dummy/app/helpers/LogicUnitReceiver.rb
index c830d80..7ba53e8 100644
--- a/test/dummy/app/helpers/LogicUnitReceiver.rb
+++ b/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
diff --git a/test/laradi_test.rb b/test/laradi_test.rb
index 6815bd3..1e44a37 100644
--- a/test/laradi_test.rb
+++ b/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