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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
describe 'Accessing a class variable' do
it "raises a RuntimeError when accessed from the toplevel scope (not in some module or class)" do
-> {
eval "@@cvar_toplevel1"
}.should raise_error(RuntimeError, 'class variable access from toplevel')
-> {
eval "@@cvar_toplevel2 = 2"
}.should raise_error(RuntimeError, 'class variable access from toplevel')
end
it "does not raise an error when checking if defined from the toplevel scope" do
-> {
eval "defined?(@@cvar_toplevel1)"
}.should_not raise_error
end
it "raises a RuntimeError when a class variable is overtaken in an ancestor class" do
parent = Class.new()
subclass = Class.new(parent)
subclass.class_variable_set(:@@cvar_overtaken, :subclass)
parent.class_variable_set(:@@cvar_overtaken, :parent)
-> {
subclass.class_variable_get(:@@cvar_overtaken)
}.should raise_error(RuntimeError, /class variable @@cvar_overtaken of .+ is overtaken by .+/)
parent.class_variable_get(:@@cvar_overtaken).should == :parent
end
end
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