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diff --git a/spec/rubyspec/language/class_variable_spec.rb b/spec/rubyspec/language/class_variable_spec.rb
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+++ b/spec/rubyspec/language/class_variable_spec.rb
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+require File.expand_path('../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/class_variables', __FILE__)
+
+describe "A class variable" do
+  after :each do
+    ClassVariablesSpec::ClassA.new.cvar_a = :cvar_a
+  end
+
+  it "can be accessed from a subclass" do
+    ClassVariablesSpec::ClassB.new.cvar_a.should == :cvar_a
+  end
+
+  it "is set in the superclass" do
+    a = ClassVariablesSpec::ClassA.new
+    b = ClassVariablesSpec::ClassB.new
+    b.cvar_a = :new_val
+
+    a.cvar_a.should == :new_val
+  end
+end
+
+describe "A class variable defined in a module" do
+  after :each do
+    ClassVariablesSpec::ClassC.cvar_m = :value
+    ClassVariablesSpec::ClassC.remove_class_variable(:@@cvar) if ClassVariablesSpec::ClassC.cvar_defined?
+  end
+
+  it "can be accessed from classes that extend the module" do
+    ClassVariablesSpec::ClassC.cvar_m.should == :value
+  end
+
+  it "is not defined in these classes" do
+    ClassVariablesSpec::ClassC.cvar_defined?.should be_false
+  end
+
+  it "is only updated in the module a method defined in the module is used" do
+    ClassVariablesSpec::ClassC.cvar_m = "new value"
+    ClassVariablesSpec::ClassC.cvar_m.should == "new value"
+
+    ClassVariablesSpec::ClassC.cvar_defined?.should be_false
+  end
+
+  it "is updated in the class when a Method defined in the class is used" do
+    ClassVariablesSpec::ClassC.cvar_c = "new value"
+    ClassVariablesSpec::ClassC.cvar_defined?.should be_true
+  end
+
+  it "can be accessed inside the class using the module methods" do
+    ClassVariablesSpec::ClassC.cvar_c = "new value"
+    ClassVariablesSpec::ClassC.cvar_m.should == :value
+  end
+
+  it "can be accessed from modules that extend the module" do
+    ClassVariablesSpec::ModuleO.cvar_n.should == :value
+  end
+
+  it "is defined in the extended module" do
+    ClassVariablesSpec::ModuleN.class_variable_defined?(:@@cvar_n).should be_true
+  end
+
+  it "is not defined in the extending module" do
+    ClassVariablesSpec::ModuleO.class_variable_defined?(:@@cvar_n).should be_false
+  end
+end
+
+describe 'A class variable definition' do
+  it "is created in a module if any of the parents do not define it" do
+    a = Class.new
+    b = Class.new(a)
+    c = Class.new(b)
+    b.class_variable_set(:@@cv, :value)
+
+    lambda { a.class_variable_get(:@@cv) }.should raise_error(NameError)
+    b.class_variable_get(:@@cv).should == :value
+    c.class_variable_get(:@@cv).should == :value
+
+    # updates the same variable
+    c.class_variable_set(:@@cv, :next)
+
+    lambda { a.class_variable_get(:@@cv) }.should raise_error(NameError)
+    b.class_variable_get(:@@cv).should == :next
+    c.class_variable_get(:@@cv).should == :next
+  end
+end