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This represents a test result in a clean way that can be marshalled over a wire. Tests can do anything they want to the test instance and can create conditions that cause Marshal.dump to blow up. By using ::from you can be reasonably sure that the test result can be marshalled.
Create a new test result from a Runnable instance.
 
               # File minitest-5.14.2/lib/minitest.rb, line 523
def self.from runnable
  o = runnable
  r = self.new o.name
  r.klass      = o.class.name
  r.assertions = o.assertions
  r.failures   = o.failures.dup
  r.time       = o.time
  r.source_location = o.method(o.name).source_location rescue ["unknown", -1]
  r
end