minitest-stub_any_instance will define a method stub on any instance of a class for the duration of a block.
String.stub_any_instance(:length, 42) do
assert_equal "hello".length, 42 # this assertion passes!
end
@nashby_ actually extracted the code from SimpleForm to do the job, and
suggested it be included in MiniTest itself. But that didn't fly, so I packaged it as a plugin/gem.
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