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describe "Kernel#singleton_class" do
it "returns class extended from an object" do
x = Object.new
xs = class << x; self; end
xs.should == x.singleton_class
end
it "returns NilClass for nil" do
nil.singleton_class.should == NilClass
end
it "returns TrueClass for true" do
true.singleton_class.should == TrueClass
end
it "returns FalseClass for false" do
false.singleton_class.should == FalseClass
end
it "raises TypeError for Fixnum" do
lambda { 123.singleton_class }.should raise_error(TypeError)
end
it "raises TypeError for Symbol" do
lambda { :foo.singleton_class }.should raise_error(TypeError)
end
end
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