func()

in dev-tools/systemtests/container.go [98:139]

• 32 lines of code
• 8 McCabe index (conditional complexity)

func (tr *DockerTestRunner) CreateAndRunPermissionMatrix(ctx context.Context,
	cgroupNSValues []container.CgroupnsMode, privilegedValues []bool, runAsUserValues []string) {

	cases := []testCase{}

	if len(cgroupNSValues) == 0 {
		cgroupNSValues = []container.CgroupnsMode{tr.CgroupNSMode}
	}

	if len(privilegedValues) == 0 {
		privilegedValues = []bool{tr.Privileged}
	}

	if len(runAsUserValues) == 0 {
		runAsUserValues = []string{tr.RunAsUser}
	}

	// Create a test matrix of every possible case.
	// This might seem like overkill, but cgroup settings and docker permissions values produce some exciting edge cases. Just run all of them.
	for _, ns := range cgroupNSValues {
		for _, user := range runAsUserValues {
			for _, privSetting := range privilegedValues {
				cases = append(cases, testCase{nsmode: ns, priv: privSetting, user: user})
			}
		}
	}

	tr.Runner.Logf("Running %d tests", len(cases))

	baseRunner := tr.Runner // some odd recursion happens here if we just refer to tr.Runner
	for _, tc := range cases {
		baseRunner.Run(tc.String(), func(t *testing.T) {
			runner := tr
			runner.Runner = t
			runner.CgroupNSMode = tc.nsmode
			runner.Privileged = tc.priv
			runner.RunAsUser = tc.user
			runner.RunTestsOnDocker(ctx)
		})
	}

}