The testing directory contains COS customizer integration tests.

Each *.yaml file in the top level of the directory corresponds to exactly one
COS customizer integration test. These *.yaml files are Cloud Build workflow
definitions, and are intended to be run with the whole COS customizer source.
For example, to run `smoke_test.yaml`, run
`gcloud builds submit --config=testing/smoke_test.yaml .` from the COS
customizer source root.

Directories contain data needed for tests; this usually includes scripts and
cloud-configs. For the most part, test assertions are made in cloud-configs
that run on instances made from generated images.

The util directory contains utilities for all tests. For example,
run_test.wf.json is a Daisy workflow that facilitates running a test.
vm.wf.json and gpu_vm.wf.json are used by run_test.wf.json for creating a
normal VM and GPU VM respectively.

To run all tests, use the run_tests.sh script in the COS customizer source
root.