Allow to specify a custom automatic mapping directory -> type

lib/rspec/rails/configuration.rb

@@ -94,8 +94,14 @@ def render_views?
           rendering_views
         end
 
-        def infer_spec_type_from_file_location!
-          DIRECTORY_MAPPINGS.each do |type, dir_parts|
+        def infer_spec_type_from_file_location!(list = {})
+          custom = list.inject({}) do |r, (k, v)|
+            dir = v ? v.to_s : "#{ k }s"
+            r[k] = ['spec', dir]
+            r
+          end
+
+          DIRECTORY_MAPPINGS.merge(custom).each do |type, dir_parts|
             escaped_path = Regexp.compile(dir_parts.join('[\\\/]') + '[\\\/]')
             define_derived_metadata(:file_path => escaped_path) do |metadata|
               metadata[:type] ||= type

spec/rspec/rails/configuration_spec.rb

@@ -148,6 +148,30 @@ def in_inferring_type_from_location_environment
     include_examples "infers type from location", :routing, "spec/routing"
     include_examples "infers type from location", :view, "spec/views"
     include_examples "infers type from location", :feature, "spec/features"
+
+    context "with a custom definition" do
+      context "use an array" do
+        def in_inferring_type_from_location_environment
+          in_sub_process do
+            RSpec.configuration.infer_spec_type_from_file_location!([:worker])
+            yield
+          end
+        end
+
+        include_examples "infers type from location", :worker, "spec/workers"
+      end
+
+      context "use a hash" do
+        def in_inferring_type_from_location_environment
+          in_sub_process do
+            RSpec.configuration.infer_spec_type_from_file_location!(sidekiq: :workers)
+            yield
+          end
+        end
+
+        include_examples "infers type from location", :sidekiq, "spec/workers"
+      end
+    end
   end
 
   it "fixture support is included with metadata `:use_fixtures`" do