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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Module#class_variable_get" do
it "returns the value of the class variable with the given name" do
c = Class.new { class_variable_set :@@class_var, "test" }
c.send(:class_variable_get, :@@class_var).should == "test"
c.send(:class_variable_get, "@@class_var").should == "test"
end
it "returns the value of a class variable with the given name defined in an included module" do
c = Class.new { include ModuleSpecs::MVars }
c.send(:class_variable_get, "@@mvar").should == :mvar
end
it "raises a NameError for a class variable named '@@'" do
c = Class.new
lambda { c.send(:class_variable_get, "@@") }.should raise_error(NameError)
lambda { c.send(:class_variable_get, :"@@") }.should raise_error(NameError)
end
it "raises a NameError for a class variables with the given name defined in an extended module" do
c = Class.new
c.extend ModuleSpecs::MVars
lambda {
c.send(:class_variable_get, "@@mvar")
}.should raise_error(NameError)
end
it "returns class variables defined in the class body and accessed in the metaclass" do
ModuleSpecs::CVars.cls.should == :class
end
it "returns class variables defined in the metaclass and accessed by class methods" do
ModuleSpecs::CVars.meta.should == :metainfo
end
it "returns class variables defined in the metaclass and accessed by instance methods" do
ModuleSpecs::CVars.new.meta.should == :metainfo
end
it "returns a class variable defined in a metaclass" do
obj = mock("metaclass class variable")
meta = obj.singleton_class
meta.send :class_variable_set, :@@var, :cvar_value
meta.send(:class_variable_get, :@@var).should == :cvar_value
end
it "raises a NameError when an uninitialized class variable is accessed" do
c = Class.new
[:@@no_class_var, "@@no_class_var"].each do |cvar|
lambda { c.send(:class_variable_get, cvar) }.should raise_error(NameError)
end
end
it "raises a NameError when the given name is not allowed" do
c = Class.new
lambda { c.send(:class_variable_get, :invalid_name) }.should raise_error(NameError)
lambda { c.send(:class_variable_get, "@invalid_name") }.should raise_error(NameError)
end
it "converts a non string/symbol/fixnum name to string using to_str" do
c = Class.new { class_variable_set :@@class_var, "test" }
(o = mock('@@class_var')).should_receive(:to_str).and_return("@@class_var")
c.send(:class_variable_get, o).should == "test"
end
it "raises a TypeError when the given names can't be converted to strings using to_str" do
c = Class.new { class_variable_set :@@class_var, "test" }
o = mock('123')
lambda { c.send(:class_variable_get, o) }.should raise_error(TypeError)
o.should_receive(:to_str).and_return(123)
lambda { c.send(:class_variable_get, o) }.should raise_error(TypeError)
end
end
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