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Just change ENV and restore it afterwards.
Stubbing ENV is not safe outside MRI. At some point after the stubbing has occurred a backtrace is printed to the ActiveSupport warning log: there Rubinius accesses ENV['RBX_NOCOLOR'] to determine if it should print the backtrace with colors or not, causing the stub to fail. Other implementations might access ENV in a different way too, we just can't predict it. The only thing we can do here is to actually set the ENV with what we want and restore it afterwards.
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