Handle nested example groups in RSpec.describe without runtime data

This fixes #89.

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Development
 
+* Fix a bug where nested example groups in `RSpec.describe` are wrongly converted to non-monkey-patch form when dynamic analysis is skipped. ([#89](https://github.com/yujinakayama/transpec/issues/89))
+
 ## v2.3.6
 
 * Fix error `Unresolved dependency found during sorting - parser` on `gem install transpec`.

lib/transpec/static_context_inspector.rb

@@ -101,12 +101,19 @@ def scope_type(node)
       end
     end
 
-    def special_block_type(block_node)
+    def special_block_type(block_node) # rubocop:disable MethodLength, CyclomaticComplexity
       send_node = block_node.children.first
       receiver_node, method_name, *_ = *send_node
 
-      if const_name(receiver_node) == 'RSpec' && method_name == :configure
-        :rspec_configure
+      if const_name(receiver_node) == 'RSpec'
+        case method_name
+        when :configure
+          :rspec_configure
+        when *EXAMPLE_GROUP_METHODS
+          :example_group
+        else
+          nil
+        end
       elsif HOOK_METHODS.include?(method_name)
         hook_type(send_node)
       elsif receiver_node

spec/transpec/static_context_inspector_spec.rb

@@ -49,6 +49,10 @@ def some_method(some_arg)
             end
           end
 
+          RSpec.describe 'something' do
+            in_rspec_describe
+          end
+
           feature 'Capybara DSL' do
             background do
               in_background
@@ -118,6 +122,10 @@ def some_method(some_arg)
           'send nil :in_block',
           'in normal block in #describe in module',
           [:module]
+        ], [
+          'send nil :in_rspec_describe',
+          'in RSpec.describe',
+          [:example_group]
         ], [
           'send nil :in_background',
           'in #background block in #feature',

spec/transpec/syntax/example_group_spec.rb

@@ -126,6 +126,42 @@ module SomeModule
           end
         end
 
+        context 'when the #describe is in another RSpec.describe' do
+          include_context 'multiple #describes'
+
+          let(:source) do
+            <<-END
+              RSpec.describe 'something' do
+                describe '#some_method' do
+                end
+              end
+            END
+          end
+
+          let(:expected_source) do
+            <<-END
+              RSpec.describe 'something' do
+                describe '#some_method' do
+                end
+              end
+            END
+          end
+
+          context 'without runtime information' do
+            it 'does nothing' do
+              rewritten_source.should == source
+            end
+          end
+
+          context 'with runtime information' do
+            include_context 'dynamic analysis objects'
+
+            it 'does nothing' do
+              rewritten_source.should == source
+            end
+          end
+        end
+
         context 'when logical-inner #describe is placed outside of the outer #describe in source' do
           include_context 'multiple #describes'