ExecCommand executes an exec.Cmd.

LoadTestEndpoints loads a default test endpoint request (a GET / request expecting a 200 status code) into an openapi3.Swagger object (see github.com/getkin/kin-openapi).

ValidateEndpoints tests all paths (represented by openapi3.Paths) with all HTTP methods and given response bodies and make sure they respond with the expected status code.

GcloudCommonFlags is a slice of common flags that should be added as arguments to all executions of the external gcloud command.