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require_relative '../../spec_helper'
describe "Kernel#singleton_method" do
it "find a method defined on the singleton class" do
obj = Object.new
def obj.foo; end
obj.singleton_method(:foo).should be_an_instance_of(Method)
end
it "returns a Method which can be called" do
obj = Object.new
def obj.foo; 42; end
obj.singleton_method(:foo).call.should == 42
end
it "only looks at singleton methods and not at methods in the class" do
klass = Class.new do
def foo
42
end
end
obj = klass.new
obj.foo.should == 42
-> {
obj.singleton_method(:foo)
}.should raise_error(NameError) { |e|
# a NameError and not a NoMethodError
e.class.should == NameError
}
end
it "raises a NameError if there is no such method" do
obj = Object.new
-> {
obj.singleton_method(:not_existing)
}.should raise_error(NameError) { |e|
# a NameError and not a NoMethodError
e.class.should == NameError
}
end
end
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