address compatibility with Rails 3.x

see rspec/rspec-core#1361

Author: pdswan

lib/rspec/rails/example/helper_example_group.rb

@@ -11,8 +11,14 @@ module HelperExampleGroup
 
       # @private
       module ClassMethods
-        def determine_constant_from_test_name(_ignore)
-          described_class if yield(described_class)
+        if ::Rails::VERSION::MAJOR > 3
+          def determine_constant_from_test_name(_ignore)
+            described_class if yield(described_class)
+          end
+        else
+          def determine_default_helper_class(_ignore)
+            described_class
+          end
         end
       end
 

spec/rspec/rails/example/helper_example_group_spec.rb

@@ -58,19 +58,37 @@ def _view
         end
       end
 
-      context "the described is a module" do
-        it "returns the module" do
-          allow(group).to receive(:described_class) { FoosHelper }
-          expect(group.determine_default_helper_class("ignore this")).
-            to eq(FoosHelper)
+      if ::Rails::VERSION::MAJOR > 3
+        context "the described is a module" do
+          it "returns the module" do
+            allow(group).to receive(:described_class) { FoosHelper }
+            expect(group.determine_default_helper_class("ignore this")).
+              to eq(FoosHelper)
+          end
+        end
+
+        context "the described is a class" do
+          it "returns nil" do
+            allow(group).to receive(:described_class) { FoosHelper::InternalClass }
+            expect(group.determine_default_helper_class("ignore this")).
+              to be_nil
+          end
+        end
+      else
+        context "the described is a module" do
+          it "returns the module" do
+            allow(group).to receive(:described_class) { FoosHelper }
+            expect(group.determine_default_helper_class("ignore this")).
+              to eq(FoosHelper)
+          end
         end
-      end
 
-      context "the described is a class" do
-        it "returns nil" do
-          allow(group).to receive(:described_class) { FoosHelper::InternalClass }
-          expect(group.determine_default_helper_class("ignore this")).
-            to be_nil
+        context "the described is a class" do
+          it "returns the class" do
+            allow(group).to receive(:described_class) { FoosHelper::InternalClass }
+            expect(group.determine_default_helper_class("ignore this")).
+              to eq(FoosHelper::InternalClass)
+          end
         end
       end
     end