the name of the test.
this is supposed to be the string url of the current test file in deno,
but since that doesn't make much sense in browser environment, I will always set it to "unknown".
lets you attach a sub-test step to your upper-level test.
Optionalparentif this test context is a sub-step of another, then the parent/upper-level test context will be referenced here.
a customizable logger. defaults to the built-in console object.
you can turn off logging by replacing the members with a dummy no-op (no-operation) function.
Internal[subtestthe child sub-test results get accumulated in here.
this interface describes your current test context, similar to
Deno.TestContext.