tree efffed53c0aab30a2bf35bce2dfc453c256f39ed
parent 3187f3da68ac311128ec1095f1630ba6b3ea5275
author mschaller <mschaller@google.com> 1582154957 -0800
committer Copybara-Service <copybara-worker@google.com> 1582155013 -0800

Refactor (Simple)SpawnResult to reduce invalid representations

This moves status-related helper method implementations from the concrete
implementation to default methods on the interface, making their
semantics clearer, and encouraging other implementations of the interface
to behave the same.

This also strengthens status/exitCode assertions in SpawnResult.Builder's
build method. This makes misuse less likely.

RELNOTES: None.
PiperOrigin-RevId: 296071684