now := time.Now()
	tmpl := &x509.Certificate{Subject: pkix.Name{CommonName: "panda"}, SerialNumber: big.NewInt(1234), NotBefore: now, NotAfter: now.Add(duration)}

	der, err := x509.CreateCertificate(rand.Reader, tmpl, caCert, crPublicKey, caPrivateKey)
	if err != nil {
		t.Fatal(err)
	}

}

func configFile(config string, templateFile string) string {
	suffix := "json"
	// Envoy will interpret the file extension to determine the type. We should detect yaml inputs
	if strings.HasSuffix(templateFile, ".yaml.tmpl") || strings.HasSuffix(templateFile, ".yaml") {
		suffix = "yaml"
	}
	return path.Join(config, fmt.Sprintf(EnvoyFileTemplate, suffix))
}

func newTemplate(templateFilePath string) (*template.Template, error) {

	type Inventory struct {
		Material string
		Count    uint
	}
	sweaters := Inventory{"wool", 17}
	tmpl, err := template.New("test").Parse("{{.Count}} items are made of {{.Material}}")
	if err != nil { panic(err) }
	err = tmpl.Execute(os.Stdout, sweaters)
	if err != nil { panic(err) }

More intricate examples appear below.

Text and spaces

		if p != nil {
			opts.Configs = append(opts.Configs, *p)
		}
	}
	configStr := opts.ConfigString
	if opts.ConfigTemplateInput != nil {
		tmpl := template.Must(template.New("").Funcs(sprig.TxtFuncMap()).Parse(opts.ConfigString))
		var buf bytes.Buffer
		if err := tmpl.Execute(&buf, opts.ConfigTemplateInput); err != nil {
			t.Fatalf("failed to execute template: %v", err)
		}
		configStr = buf.String()
	}

			if err = i.Run(&output, printer); err != nil {
				t.Fatalf("did not expect an error running the Images command: %v", err)
			}

			tmpl, err := template.New("test").Parse(tc.expectedOutput)
			if err != nil {
				t.Fatalf("could not create template: %v", err)
			}
			if err = tmpl.Execute(&expectedOutput, versionMapping); err != nil {
				t.Fatalf("could not execute template: %v", err)
			}

	"istio.io/istio/pkg/test/framework/components/environment/kube"
	"istio.io/istio/pkg/test/framework/components/namespace"
	"istio.io/istio/pkg/test/framework/components/prometheus"
	"istio.io/istio/pkg/test/util/tmpl"
	util "istio.io/istio/tests/integration/telemetry"
)

const (
	// ServiceEntry is used to create conflicts on various ports
	// As defined below, the tcp-conflict and https-conflict ports are 9443 and 9091

		if err != nil {
			t.Fatal(err)
		}
	} else {
		vc, err = inject.NewValuesConfig(`
global:
  hub: test
  tag: test`)
		if err != nil {
			t.Fatal(err)
		}

	}
	tmpl, err := inject.ParseTemplates(map[string]string{
		"kube-gateway": file.AsStringOrFail(t, filepath.Join(env.IstioSrc, "manifests/charts/istio-control/istio-discovery/files/kube-gateway.yaml")),

			t.RunTraffic(TrafficTestCase{
				name:   "source ip " + c.Config().Service,
				config: svc + tmpl.MustEvaluate(destRule, "useSourceIp: true"),
				call:   c.CallOrFail,
				opts:   callOpts,
			})
			t.RunTraffic(TrafficTestCase{
				name:   "query param" + c.Config().Service,
				config: svc + tmpl.MustEvaluate(destRule, "httpQueryParameterName: some-query-param"),
				call:   c.CallOrFail,
				opts:   callOpts,

	signingKey crypto.PrivateKey, subjectIDs []string, ttl time.Duration, isCA bool,
) (cert []byte, err error) {
	tmpl, err := genCertTemplateFromCSR(csr, subjectIDs, ttl, isCA)
	if err != nil {
		return nil, err
	}
	return x509.CreateCertificate(rand.Reader, tmpl, signingCert, publicKey, signingKey)
}

// LoadSignerCredsFromFiles loads the signer cert&key from the given files.
//

	}

	t.Parallel()

	tmpl := template.Must(template.New("pie").Parse(pieSourceTemplate))

	writeGo := func(t *testing.T, dir string) {
		f, err := os.Create(filepath.Join(dir, "pie.go"))
		if err != nil {
			t.Fatal(err)
		}

		// Passing a 100-element slice here will cause
		// pieSourceTemplate to create 100 variables with
		// different types.
		if err := tmpl.Execute(f, make([]byte, 100)); err != nil {