CaptureStdOut captures Stdout to a string.

CaptureUserOut captures output written to UserOut to a string.

Chdir will change to the directory for the site specified by TestSite.

CleanupDir removes a directory specified by string.

ClearDockerEnv unsets env vars set in platform DockerEnv() so that they can be set by another test run.

ContainerCheck determines if a given container name exists and matches a given state.

CreateTmpDir creates a temporary directory and returns its path as a string.

GetCachedArchive returns a directory populated with the contents of the specified archive, either from cache or from downloading and creating cache.

OsTempDir gets os.TempDir() (usually provided by $TMPDIR) but expands any symlinks found within it.

TimeTrack determines the amount of time a function takes to return.

TestSite describes a site for testing, with name, URL of tarball, and optional dir.