gistfile1.rb

module LocalContextFeature
	def local_context(name, &block)
		raise NameError, "local context `#{name}' is already defined" if find_local_context(name)
		@local_contexts ||= {}
		@local_contexts[name] = block
	end

	def include_local_context(name)
		lc = find_local_context(name)
		if lc
			instance_eval(&lc)
		else
			raise NameError, "local context `#{name}' is not defined"
		end
	end

	def find_local_context(name)
		@local_contexts ||= {}
		@local_contexts[name] || (superclass.respond_to?(:find_local_context) ? superclass.find_local_context(name) : nil)
	end
end

class RSpec::Core::ExampleGroup
	extend LocalContextFeature
end

describe LocalContextFeature do
	local_context "test 1" do
		before do
			@v = "t1"
		end
	end

	context "already defined" do
		exception = nil
		begin
			local_context "test 1"
		rescue NameError
			exception = $!
		end

		subject { exception }

		it { should be_kind_of(NameError) }
		its(:message){ should == "local context `test 1' is already defined" }
	end

	context "include local context" do
		include_local_context("test 1")
		subject { @v }
		it { should == "t1" }
	end

	context "not defined" do
		exception = nil
		begin
			include_local_context "test 2"
		rescue NameError
			exception = $!
		end
		subject { exception }

		it { should be_kind_of(NameError) }
		its(:message){ should == "local context `test 2' is not defined" }
	end

	context "add local context in sub class" do
		local_context "test 2" do
			before do
				@v2 = "t2"
			end
		end

		context "use local context" do
			include_local_context "test 1"
			include_local_context "test 2"
			it do
				@v.should == "t1"
				@v2.should == "t2"
			end
		end
	end

	context "context defined at other sub class is not available" do
		exception = nil
		begin
			include_local_context "test 2"
		rescue NameError
			exception = $!
		end
		subject { exception }

		its(:message){ should == "local context `test 2' is not defined" }
	end
end