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path: root/spec/ruby/core/module/singleton_class_spec.rb
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require_relative '../../spec_helper'

describe "Module#singleton_class?" do
  it "returns true for singleton classes" do
    xs = self.singleton_class
    xs.should.singleton_class?
  end

  it "returns false for other classes" do
    c = Class.new
    c.should_not.singleton_class?
  end

  describe "with singleton values" do
    it "returns false for nil's singleton class" do
      NilClass.should_not.singleton_class?
    end

    it "returns false for true's singleton class" do
      TrueClass.should_not.singleton_class?
    end

    it "returns false for false's singleton class" do
      FalseClass.should_not.singleton_class?
    end
  end
end