How to test if if method has an alias?
Let\'s say we have
Class Test
class << self
def a;end
alias :b :a
end
end
You can set a result to your function to check if result is same.
def a
return 'test string'
end
then it { expect(Test.b).to eq(Test.a) }
is it ok?
You can use Object#method.
Test.method(:b) == Test.method(:a)
You can use:
expect(obj.method(:method)).to eq(obj.method(:alias))
oldergod's answer works in most scenarios:
Test.method(:b) == Test.method(:a)
Unfortunately it doesn't work in Ruby 2.3+ when the two methods have different owners (e.g. when the method is defined in a module, and the alias is defined in a class that includes the module). This is because the behavior of Method#== changed in Ruby 2.3:
If owners of methods are different, the behavior of
super
is different in the methods, soMethod#==
should not return true for the methods.
If you find yourself in this situation, where you want to test that two methods are aliases of each other but they have different owners, you can use Method#original_name
or Method#source_location
instead:
Test.method(:b).original_name == Test.method(:a).original_name
Test.method(:b).source_location == Test.method(:a).source_location