support let in SharedContext

Changelog.md

@@ -4,6 +4,7 @@
   * --order (Justin Ko)
     * Run your examples in random order: `--order rand`
     * Pass a seed: `--order random:123`
+  * SharedContext supports `let` (David Chelimsky)
 
 * Bug fixes
   * Make sure the `bar` in `--tag foo:bar` makes it to DRb (Aaron Gibralter)

lib/rspec/core/shared_context.rb

@@ -2,6 +2,7 @@ module RSpec
   module Core
     module SharedContext
       include Hooks
+      include Let::ClassMethods
 
       def included(group)
         [:before, :after].each do |type|

spec/rspec/core/shared_context_spec.rb

@@ -9,7 +9,7 @@
     RSpec::SharedContext
   end
 
-  it "expose before and after hooks" do
+  it "supports before and after hooks" do
     before_all_hook = false
     before_each_hook = false
     after_each_hook = false
@@ -33,4 +33,20 @@
     after_each_hook.should be_true
     after_all_hook.should be_true
   end
+
+  it "supports let" do
+    whatever = nil
+    shared = Module.new do
+      extend RSpec::SharedContext
+      let(:foo) { 'foo' }
+    end
+    group = RSpec::Core::ExampleGroup.describe do
+      include shared
+      example { whatever = foo }
+    end
+
+    group.run
+
+    whatever.should eq('foo')
+  end
 end