Fix nested described class

Changelog.md

@@ -1,6 +1,12 @@
 ### 3.0.0.rc1 Development
 [Full Changelog](http://github.com/rspec/rspec-core/compare/v3.0.0.beta2...master)
 
+Breaking Changes for 3.0.0:
+
+* Change `described_class` so that in a nested group like `describe
+  MyClass`, it returns `MyClass` rather than the outer group's described
+  class. (Myron Marston)
+
 Enhancements:
 
 * Add `config.default_formatter` attribute, which can be used to set a

features/subject/implicit_subject.feature

@@ -33,7 +33,7 @@ Feature: implicitly defined subject
     When I run `rspec nested_subject_spec.rb`
     Then the examples should all pass
 
-  Scenario: subject in a nested group with a different class (outermost wins)
+  Scenario: subject in a nested group with a different class (innermost wins)
     Given a file named "nested_subject_spec.rb" with:
       """ruby
       class ArrayWithOneElement < Array
@@ -46,14 +46,8 @@ Feature: implicitly defined subject
       describe Array do
         describe ArrayWithOneElement do
           context "referenced as subject" do
-            it "should be empty (because it is the Array declared at the top)" do
-              expect(subject).to be_empty
-            end
-          end
-
-          context "created in the example" do
-            it "should not be empty" do
-              expect(ArrayWithOneElement.new).not_to be_empty
+            it "contains one element" do
+              expect(subject).to include("first element")
             end
           end
         end

lib/rspec/core/metadata.rb

@@ -148,9 +148,7 @@ def described_class
                 return value unless value.nil?
               end
             end
-          end
 
-          container_stack.reverse.each do |g|
             candidate = g[:description_args].first
             return candidate unless String === candidate || Symbol === candidate
           end

spec/rspec/core/example_group_spec.rb

@@ -472,7 +472,7 @@ def ascending_numbers
       context "in a nested group" do
         it "inherits the described class/module from the outer group" do
           group = ExampleGroup.describe(String) do
-            describe Array do
+            describe "nested" do
               example "describes is String" do
                 expect(described_class).to eq(String)
               end
@@ -481,6 +481,29 @@ def ascending_numbers
 
           expect(group.run).to be_truthy, "expected examples in group to pass"
         end
+
+        context "when a class is passed" do
+          def described_class_value
+            value = nil
+
+            ExampleGroup.describe(String) do
+              yield if block_given?
+              describe Array do
+                example { value = described_class }
+              end
+            end.run
+
+            value
+          end
+
+          it "overrides the described class" do
+            expect(described_class_value).to eq(Array)
+          end
+
+          it "overrides the described class even when described_class is referenced in the outer group" do
+            expect(described_class_value { described_class }).to eq(Array)
+          end
+        end
       end
 
       context "for `describe(SomeClass)` within a `describe 'some string' group" do
@@ -1111,8 +1134,8 @@ def extract_execution_results(group)
     describe Object, "describing nested example_groups", :little_less_nested => 'yep' do
 
       describe "A sample nested group", :nested_describe => "yep" do
-        it "sets the described class to the described class of the outer most group" do |ex|
-          expect(ex.example_group.described_class).to eq(ExampleGroup)
+        it "sets the described class to the nearest described class" do |ex|
+          expect(ex.example_group.described_class).to eq(Object)
         end
 
         it "sets the description to 'A sample nested describe'" do |ex|

spec/rspec/core/metadata_spec.rb

@@ -290,36 +290,36 @@ module Core
           end
 
           context "in a nested group" do
-            it "returns the parent group's described class" do
-              sm = Metadata.new
-              sm.process(String)
+            it "inherits the parent group's described class" do
+              parent = Metadata.new
+              parent.process(Hash)
 
-              m = Metadata.new(sm)
-              m.process(Array)
+              child = Metadata.new(parent)
+              child.process("sub context")
 
-              expect(m[:example_group][key]).to be(String)
+              expect(child[:example_group][key]).to be(Hash)
             end
 
-            it "returns own described class if parent doesn't have one" do
-              sm = Metadata.new
-              sm.process("foo")
+            it "sets the described class when passing a class" do
+              parent = Metadata.new
+              parent.process(String)
 
-              m = Metadata.new(sm)
-              m.process(Array)
+              child = Metadata.new(parent)
+              child.process(Array)
 
-              expect(m[:example_group][key]).to be(Array)
+              expect(child[:example_group][key]).to be(Array)
             end
 
-            it "can override a parent group's described class" do
+            it "can override a parent group's described class using metdata" do
               parent = Metadata.new
               parent.process(String)
 
               child = Metadata.new(parent)
-              child.process(Fixnum)
+              child.process("sub context")
               child[:example_group][key] = Hash
 
               grandchild = Metadata.new(child)
-              grandchild.process(Array)
+              grandchild.process("sub context")
 
               expect(grandchild[:example_group][key]).to be(Hash)
               expect(child[:example_group][key]).to be(Hash)

spec/spec_helper.rb

@@ -89,10 +89,6 @@ def run(reporter=nil)
     end
   end
 
-  def in_editor?
-    ENV.has_key?('TM_MODE') || ENV.has_key?('EMACS') || ENV.has_key?('VIM')
-  end
-
   module EnvHelpers
     def with_env_vars(vars)
       original = ENV.to_hash
@@ -135,7 +131,7 @@ def without_env_vars(*vars)
     end
 
     # runtime options
-    c.color = !in_editor?
+    c.color = true
     c.include EnvHelpers
     c.filter_run_excluding :ruby => lambda {|version|
       case version.to_s