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