Builder reports the name of the builder running this test (for example, "linux-amd64" or "windows-386-gce").

CanInternalLink reports whether the current system can link programs with internal linking.

CleanCmdEnv will fill cmd.Env with the environment, excluding certain variables that could modify the behavior of the Go tools such as GODEBUG and GOTRACEBACK.

CPUIsSlow reports whether the CPU running the test is suspected to be slow.

GoTool reports the path to the Go tool.

GoToolPath reports the path to the Go tool.

HasCGO reports whether the current system can use cgo.

HasExec reports whether the current system can start new processes using os.StartProcess or (more commonly) exec.Command.

HasExternalNetwork reports whether the current system can use external (non-localhost) networks.

HasGoBuild reports whether the current system can build programs with ``go build'' and then run them with os.StartProcess or exec.Command.

HasGoRun reports whether the current system can run programs with ``go run.''.

HasLink reports whether the current system can use os.Link.

HasSrc reports whether the entire source tree is available under GOROOT.

HasSymlink reports whether the current system can use os.Symlink.

MustHaveCGO calls t.Skip if cgo is not available.

MustHaveExec checks that the current system can start new processes using os.StartProcess or (more commonly) exec.Command.

MustHaveExecPath checks that the current system can start the named executable using os.StartProcess or (more commonly) exec.Command.

MustHaveExternalNetwork checks that the current system can use external (non-localhost) networks.

MustHaveGoBuild checks that the current system can build programs with ``go build'' and then run them with os.StartProcess or exec.Command.

MustHaveGoRun checks that the current system can run programs with ``go run.'' If not, MustHaveGoRun calls t.Skip with an explanation.

MustHaveLink reports whether the current system can use os.Link.

MustHaveSymlink reports whether the current system can use os.Symlink.

MustInternalLink checks that the current system can link programs with internal linking.

RunWithTimeout runs cmd and returns its combined output.

SkipIfShortAndSlow skips t if -short is set and the CPU running the test is suspected to be slow.

Sigquit is the signal to send to kill a hanging subprocess.