Testing a singleton method

Ruby
1

Trying to pass a unit test;

def test_singleton_method
string1 = “hello”
string2 = “world”

assert string1.respond_to?(:only_one)
assert !string2.respond_to?(:only_one)

end

====

my code to pass it:

string1 = “hello”
string2 = “world”

def string1.only_one
puts “PLEASE WORK”
end

===

yet, this doesn’t work, is there something I’m missing?

2

I’m not exactly sure what you are trying to test, but this works:

def test_singleton_method
string1 = “hello”
string2 = “world”
def string1.only_one
puts “PLEASE WORK”
end
assert string1.respond_to?(:only_one)
assert !string2.respond_to?(:only_one)
end

3

Could you post more context?

Chances are the singleton you think you’re testing is not the same
instance you actually are testing.

Julian.

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