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// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
Package runner provides functionality shared by test runners.
Test runners are executables that run one or more test bundles and
aggregate the results. Runners are executed by the tast command.
local_test_runner executes local bundles on-device, while remote_test_runner
executes remote bundles on the system where the tast command is running
(e.g. a developer's workstation).
The tast command writes a JSON-marshaled RunnerArgs struct to a runner's stdin,
which instructs the runner to report progress by writing JSON-marshaled
control messages to stdout. In this mode, the runner exits with status code
0 in almost all cases (the one exception being malformed arguments), since
the result of the run is already communicated via control messages.
When a test runner is executed manually in conjunction with command-line
flags, the runner instead logs human-readable progress to stdout. The runner
exits with a nonzero status code if an error is encountered.
package runner