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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe :kernel_remove_instance_variable, shared: true do
it "returns the instance variable's value" do
value = @instance.send :remove_instance_variable, @object
value.should == "hello"
end
it "removes the instance variable" do
@instance.send :remove_instance_variable, @object
@instance.instance_variable_defined?(@object).should be_false
end
end
describe "Kernel#remove_instance_variable" do
before do
@instance = KernelSpecs::InstanceVariable.new
end
it "is a public method" do
Kernel.should have_public_instance_method(:remove_instance_variable, false)
end
it "raises a NameError if the instance variable is not defined" do
-> do
@instance.send :remove_instance_variable, :@unknown
end.should raise_error(NameError)
end
it "raises a NameError if the argument is not a valid instance variable name" do
-> do
@instance.send :remove_instance_variable, :"@0"
end.should raise_error(NameError)
end
it "raises a TypeError if passed an Object not defining #to_str" do
-> do
obj = mock("kernel remove_instance_variable")
@instance.send :remove_instance_variable, obj
end.should raise_error(TypeError)
end
it "raises a FrozenError if self is frozen" do
o = Object.new
o.freeze
-> { o.remove_instance_variable(:@foo) }.should raise_error(FrozenError)
-> { o.remove_instance_variable(:foo) }.should raise_error(NameError)
end
it "raises for frozen objects" do
-> { nil.remove_instance_variable(:@foo) }.should raise_error(FrozenError)
-> { nil.remove_instance_variable(:foo) }.should raise_error(NameError)
-> { :foo.remove_instance_variable(:@foo) }.should raise_error(FrozenError)
end
describe "when passed a String" do
it_behaves_like :kernel_remove_instance_variable, nil, "@greeting"
end
describe "when passed a Symbol" do
it_behaves_like :kernel_remove_instance_variable, nil, :@greeting
end
describe "when passed an Object" do
it "calls #to_str to convert the argument" do
name = mock("kernel remove_instance_variable")
name.should_receive(:to_str).and_return("@greeting")
@instance.send :remove_instance_variable, name
end
end
end
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