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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../../../fixtures/constants', __FILE__)
describe "Module#remove_const" do
it "removes the constant specified by a String or Symbol from the receiver's constant table" do
ConstantSpecs::ModuleM::CS_CONST252 = :const252
ConstantSpecs::ModuleM::CS_CONST252.should == :const252
ConstantSpecs::ModuleM.send :remove_const, :CS_CONST252
lambda { ConstantSpecs::ModuleM::CS_CONST252 }.should raise_error(NameError)
ConstantSpecs::ModuleM::CS_CONST253 = :const253
ConstantSpecs::ModuleM::CS_CONST253.should == :const253
ConstantSpecs::ModuleM.send :remove_const, "CS_CONST253"
lambda { ConstantSpecs::ModuleM::CS_CONST253 }.should raise_error(NameError)
end
it "returns the value of the removed constant" do
ConstantSpecs::ModuleM::CS_CONST254 = :const254
ConstantSpecs::ModuleM.send(:remove_const, :CS_CONST254).should == :const254
end
it "raises a NameError and does not call #const_missing if the constant is not defined" do
ConstantSpecs.should_not_receive(:const_missing)
lambda { ConstantSpecs.send(:remove_const, :Nonexistent) }.should raise_error(NameError)
end
it "raises a NameError and does not call #const_missing if the constant is not defined directly in the module" do
begin
ConstantSpecs::ModuleM::CS_CONST255 = :const255
ConstantSpecs::ContainerA::CS_CONST255.should == :const255
ConstantSpecs::ContainerA.should_not_receive(:const_missing)
lambda do
ConstantSpecs::ContainerA.send :remove_const, :CS_CONST255
end.should raise_error(NameError)
ensure
ConstantSpecs::ModuleM.send :remove_const, "CS_CONST255"
end
end
it "raises a NameError if the name does not start with a capital letter" do
lambda { ConstantSpecs.send :remove_const, "name" }.should raise_error(NameError)
end
it "raises a NameError if the name starts with a non-alphabetic character" do
lambda { ConstantSpecs.send :remove_const, "__CONSTX__" }.should raise_error(NameError)
lambda { ConstantSpecs.send :remove_const, "@Name" }.should raise_error(NameError)
lambda { ConstantSpecs.send :remove_const, "!Name" }.should raise_error(NameError)
lambda { ConstantSpecs.send :remove_const, "::Name" }.should raise_error(NameError)
end
it "raises a NameError if the name contains non-alphabetic characters except '_'" do
ConstantSpecs::ModuleM::CS_CONST256 = :const256
ConstantSpecs::ModuleM.send :remove_const, "CS_CONST256"
lambda { ConstantSpecs.send :remove_const, "Name=" }.should raise_error(NameError)
lambda { ConstantSpecs.send :remove_const, "Name?" }.should raise_error(NameError)
end
it "calls #to_str to convert the given name to a String" do
ConstantSpecs::CS_CONST257 = :const257
name = mock("CS_CONST257")
name.should_receive(:to_str).and_return("CS_CONST257")
ConstantSpecs.send(:remove_const, name).should == :const257
end
it "raises a TypeError if conversion to a String by calling #to_str fails" do
name = mock('123')
lambda { ConstantSpecs.send :remove_const, name }.should raise_error(TypeError)
name.should_receive(:to_str).and_return(123)
lambda { ConstantSpecs.send :remove_const, name }.should raise_error(TypeError)
end
it "is a private method" do
Module.private_methods.should include(:remove_const)
end
it "returns nil when removing autoloaded constant" do
ConstantSpecs.autoload :AutoloadedConstant, 'a_file'
ConstantSpecs.send(:remove_const, :AutoloadedConstant).should be_nil
end
end
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