require_relative '../spec_helper' require_relative '../fixtures/class_variables' 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) -> { 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) -> { 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