fails:ENV.reject! rejects entries based on key
fails:ENV.reject! rejects entries based on value
fails:ENV.reject! returns itself or nil
fails:ENV.reject! returns an Enumerator if called without a block
fails:ENV.reject! doesn't raise if empty
fails:ENV.reject rejects entries based on key
fails:ENV.reject rejects entries based on value
fails:ENV.reject returns a Hash
fails:ENV.reject returns an Enumerator if called without a block
fails:ENV.reject doesn't raise if empty
