TestOne test: a named method (declared with TestSuite#test:) that runs with the Test itself as receiver, so the body's bare .is:... / .does:... sends land on the mixed-in assertion vocabulary (BuiltinAssertions, IterateAssertions) and accumulate TestAssertionResults here.
File one assertion's result — the sink the BuiltinAssertions mixin requires of its host. Answers the result.
The sum of the assertions' own check times, in microseconds.
The assertion results recorded so far that failed.
Internal: wrap the test Method; its selector becomes the test's name. TestSuite#test: is the constructor's call site.
The test's name: its method's selector.
The assertion results recorded so far that passed.
The reporter of the run in progress (set by run:); assertions notify it as they start and finish.
Run the test method with this Test as the receiver, timing the whole body; answers a TestResult summarizing the recorded assertions.
A Test prints as its name.
Wall-clock time of the whole test method run, in microseconds — includes the work between assertions, unlike elapsed.