Registry: an API for shared state in cucumber steps

features/support/registry.rb

@@ -0,0 +1,14 @@
+class Registry
+  def self.[](key)
+    registry[key]
+  end
+
+  def self.[]=(key,value)
+    registry[key] = value
+  end
+
+  private
+  def self.registry
+    @registry ||= {}
+  end
+end

spec/features/support/registry_spec.rb

@@ -0,0 +1,23 @@
+require File.join(File.dirname(__FILE__), '..', '..', 'spec_helper')
+require File.join(File.dirname(__FILE__), '..', '..', '..', 'features', 'support', 'registry')
+
+describe Registry do
+  describe ".[]" do
+    subject { Registry[arg] }
+    context "when there is an associated key" do
+      let(:arg) { 'foo' }
+      before{ Registry.instance_variable_set('@registry', { 'foo' => 'bar'  }) }
+      it { should == 'bar' }
+    end
+    context "when there is no associated key" do
+      let(:arg) { 'bar' }
+      it { should be_nil }
+    end
+  end
+
+  describe ".[]=" do
+    subject{ Registry['foo'] }
+    before { Registry['foo'] = 'bar' }
+    it { should == 'bar' }
+  end
+end