cmd/godoc/godoc_test.go - tools - Git at Google

 // Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 package main

 import (
 	"bytes"
 	"context"
 	"fmt"
 	"go/build"
 	"io/ioutil"
 	"net"
 	"net/http"
 	"os"
 	"os/exec"
 	"regexp"
 	"runtime"
 	"strings"
 	"sync"
 	"testing"
 	"time"

 	"golang.org/x/tools/go/packages/packagestest"
 	"golang.org/x/tools/internal/testenv"
 )

 func TestMain(m *testing.M) {
 	if os.Getenv("GODOC_TEST_IS_GODOC") != "" {
 		main()
 		os.Exit(0)
 	}

 	// Inform subprocesses that they should run the cmd/godoc main instead of
 	// running tests. It's a close approximation to building and running the real
 	// command, and much less complicated and expensive to build and clean up.
 	os.Setenv("GODOC_TEST_IS_GODOC", "1")

 	os.Exit(m.Run())
 }

 var exe struct {
 	path string
 	err  error
 	once sync.Once
 }

 func godocPath(t *testing.T) string {
 	if !testenv.HasExec() {
 		t.Skipf("skipping test that requires exec")
 	}

 	exe.once.Do(func() {
 		exe.path, exe.err = os.Executable()
 	})
 	if exe.err != nil {
 		t.Fatal(exe.err)
 	}
 	return exe.path
 }

 func serverAddress(t *testing.T) string {
 	ln, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
 		ln, err = net.Listen("tcp6", "[::1]:0")
 	}
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer ln.Close()
 	return ln.Addr().String()
 }

 func waitForServerReady(t *testing.T, ctx context.Context, cmd *exec.Cmd, addr string) {
 	waitForServer(t, ctx,
 		fmt.Sprintf("http://%v/", addr),
 		"Go Documentation Server",
 		false)
 }

 func waitForSearchReady(t *testing.T, ctx context.Context, cmd *exec.Cmd, addr string) {
 	waitForServer(t, ctx,
 		fmt.Sprintf("http://%v/search?q=FALLTHROUGH", addr),
 		"The list of tokens.",
 		false)
 }

 func waitUntilScanComplete(t *testing.T, ctx context.Context, addr string) {
 	waitForServer(t, ctx,
 		fmt.Sprintf("http://%v/pkg", addr),
 		"Scan is not yet complete",
 		// setting reverse as true, which means this waits
 		// until the string is not returned in the response anymore
 		true)
 }

 const pollInterval = 50 * time.Millisecond

 // waitForServer waits for server to meet the required condition,
 // failing the test if ctx is canceled before that occurs.
 func waitForServer(t *testing.T, ctx context.Context, url, match string, reverse bool) {
 	start := time.Now()
 	for {
 		if ctx.Err() != nil {
 			t.Helper()
 			t.Fatalf("server failed to respond in %v", time.Since(start))
 		}

 		time.Sleep(pollInterval)
 		res, err := http.Get(url)
 		if err != nil {
 			continue
 		}
 		body, err := ioutil.ReadAll(res.Body)
 		res.Body.Close()
 		if err != nil || res.StatusCode != http.StatusOK {
 			continue
 		}
 		switch {
 		case !reverse && bytes.Contains(body, []byte(match)),
 			reverse && !bytes.Contains(body, []byte(match)):
 			return
 		}
 	}
 }

 // hasTag checks whether a given release tag is contained in the current version
 // of the go binary.
 func hasTag(t string) bool {
 	for _, v := range build.Default.ReleaseTags {
 		if t == v {
 			return true
 		}
 	}
 	return false
 }

 func TestURL(t *testing.T) {
 	if runtime.GOOS == "plan9" {
 		t.Skip("skipping on plan9; fails to start up quickly enough")
 	}
 	bin := godocPath(t)

 	testcase := func(url string, contents string) func(t *testing.T) {
 		return func(t *testing.T) {
 			stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)

 			args := []string{fmt.Sprintf("-url=%s", url)}
 			cmd := testenv.Command(t, bin, args...)
 			cmd.Stdout = stdout
 			cmd.Stderr = stderr
 			cmd.Args[0] = "godoc"

 			// Set GOPATH variable to a non-existing absolute path
 			// and GOPROXY=off to disable module fetches.
 			// We cannot just unset GOPATH variable because godoc would default it to ~/go.
 			// (We don't want the indexer looking at the local workspace during tests.)
 			cmd.Env = append(os.Environ(),
 				"GOPATH=/does_not_exist",
 				"GOPROXY=off",
 				"GO111MODULE=off")

 			if err := cmd.Run(); err != nil {
 				t.Fatalf("failed to run godoc -url=%q: %s\nstderr:\n%s", url, err, stderr)
 			}

 			if !strings.Contains(stdout.String(), contents) {
 				t.Errorf("did not find substring %q in output of godoc -url=%q:\n%s", contents, url, stdout)
 			}
 		}
 	}

 	t.Run("index", testcase("/", "These packages are part of the Go Project but outside the main Go tree."))
 	t.Run("fmt", testcase("/pkg/fmt", "Package fmt implements formatted I/O"))
 }

 // Basic integration test for godoc HTTP interface.
 func TestWeb(t *testing.T) {
 	bin := godocPath(t)

 	for _, x := range packagestest.All {
 		t.Run(x.Name(), func(t *testing.T) {
 			testWeb(t, x, bin, false)
 		})
 	}
 }

 // Basic integration test for godoc HTTP interface.
 func TestWebIndex(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping slow test in -short mode")
 	}
 	bin := godocPath(t)
 	testWeb(t, packagestest.GOPATH, bin, true)
 }

 // Basic integration test for godoc HTTP interface.
 func testWeb(t *testing.T, x packagestest.Exporter, bin string, withIndex bool) {
 	switch runtime.GOOS {
 	case "plan9":
 		t.Skip("skipping on plan9: fails to start up quickly enough")
 	case "android", "ios":
 		t.Skip("skipping on mobile: lacks GOROOT/api in test environment")
 	}

 	// Write a fake GOROOT/GOPATH with some third party packages.
 	e := packagestest.Export(t, x, []packagestest.Module{
 		{
 			Name: "godoc.test/repo1",
 			Files: map[string]interface{}{
 				"a/a.go": `// Package a is a package in godoc.test/repo1.
 package a; import _ "godoc.test/repo2/a"; const Name = "repo1a"`,
 				"b/b.go": `package b; const Name = "repo1b"`,
 			},
 		},
 		{
 			Name: "godoc.test/repo2",
 			Files: map[string]interface{}{
 				"a/a.go": `package a; const Name = "repo2a"`,
 				"b/b.go": `package b; const Name = "repo2b"`,
 			},
 		},
 	})
 	defer e.Cleanup()

 	// Start the server.
 	addr := serverAddress(t)
 	args := []string{fmt.Sprintf("-http=%s", addr)}
 	if withIndex {
 		args = append(args, "-index", "-index_interval=-1s")
 	}
 	cmd := testenv.Command(t, bin, args...)
 	cmd.Dir = e.Config.Dir
 	cmd.Env = e.Config.Env
 	cmdOut := new(strings.Builder)
 	cmd.Stdout = cmdOut
 	cmd.Stderr = cmdOut
 	cmd.Args[0] = "godoc"

 	if err := cmd.Start(); err != nil {
 		t.Fatalf("failed to start godoc: %s", err)
 	}
 	ctx, cancel := context.WithCancel(context.Background())
 	go func() {
 		err := cmd.Wait()
 		t.Logf("%v: %v", cmd, err)
 		cancel()
 	}()
 	defer func() {
 		// Shut down the server cleanly if possible.
 		if runtime.GOOS == "windows" {
 			cmd.Process.Kill() // Windows doesn't support os.Interrupt.
 		} else {
 			cmd.Process.Signal(os.Interrupt)
 		}
 		<-ctx.Done()
 		t.Logf("server output:\n%s", cmdOut)
 	}()

 	if withIndex {
 		waitForSearchReady(t, ctx, cmd, addr)
 	} else {
 		waitForServerReady(t, ctx, cmd, addr)
 		waitUntilScanComplete(t, ctx, addr)
 	}

 	tests := []struct {
 		path        string
 		contains    []string // substring
 		match       []string // regexp
 		notContains []string
 		needIndex   bool
 		releaseTag  string // optional release tag that must be in go/build.ReleaseTags
 	}{
 		{
 			path: "/",
 			contains: []string{
 				"Go Documentation Server",
 				"Standard library",
 				"These packages are part of the Go Project but outside the main Go tree.",
 			},
 		},
 		{
 			path:     "/pkg/fmt/",
 			contains: []string{"Package fmt implements formatted I/O"},
 		},
 		{
 			path:     "/src/fmt/",
 			contains: []string{"scan_test.go"},
 		},
 		{
 			path:     "/src/fmt/print.go",
 			contains: []string{"// Println formats using"},
 		},
 		{
 			path: "/pkg",
 			contains: []string{
 				"Standard library",
 				"Package fmt implements formatted I/O",
 				"Third party",
 				"Package a is a package in godoc.test/repo1.",
 			},
 			notContains: []string{
 				"internal/syscall",
 				"cmd/gc",
 			},
 		},
 		{
 			path: "/pkg/?m=all",
 			contains: []string{
 				"Standard library",
 				"Package fmt implements formatted I/O",
 				"internal/syscall/?m=all",
 			},
 			notContains: []string{
 				"cmd/gc",
 			},
 		},
 		{
 			path: "/search?q=ListenAndServe",
 			contains: []string{
 				"/src",
 			},
 			notContains: []string{
 				"/pkg/bootstrap",
 			},
 			needIndex: true,
 		},
 		{
 			path: "/pkg/strings/",
 			contains: []string{
 				`href="/src/strings/strings.go"`,
 			},
 		},
 		{
 			path: "/cmd/compile/internal/amd64/",
 			contains: []string{
 				`href="/src/cmd/compile/internal/amd64/ssa.go"`,
 			},
 		},
 		{
 			path: "/pkg/math/bits/",
 			contains: []string{
 				`Added in Go 1.9`,
 			},
 		},
 		{
 			path: "/pkg/net/",
 			contains: []string{
 				`// IPv6 scoped addressing zone; added in Go 1.1`,
 			},
 		},
 		{
 			path: "/pkg/net/http/httptrace/",
 			match: []string{
 				`Got1xxResponse.*// Go 1\.11`,
 			},
 			releaseTag: "go1.11",
 		},
 		// Verify we don't add version info to a struct field added the same time
 		// as the struct itself:
 		{
 			path: "/pkg/net/http/httptrace/",
 			match: []string{
 				`(?m)GotFirstResponseByte func\(\)\s*$`,
 			},
 		},
 		// Remove trailing periods before adding semicolons:
 		{
 			path: "/pkg/database/sql/",
 			contains: []string{
 				"The number of connections currently in use; added in Go 1.11",
 				"The number of idle connections; added in Go 1.11",
 			},
 			releaseTag: "go1.11",
 		},

 		// Third party packages.
 		{
 			path:     "/pkg/godoc.test/repo1/a",
 			contains: []string{`const <span id="Name">Name</span> = &#34;repo1a&#34;`},
 		},
 		{
 			path:     "/pkg/godoc.test/repo2/b",
 			contains: []string{`const <span id="Name">Name</span> = &#34;repo2b&#34;`},
 		},
 	}
 	for _, test := range tests {
 		if test.needIndex && !withIndex {
 			continue
 		}
 		url := fmt.Sprintf("http://%s%s", addr, test.path)
 		resp, err := http.Get(url)
 		if err != nil {
 			t.Errorf("GET %s failed: %s", url, err)
 			continue
 		}
 		body, err := ioutil.ReadAll(resp.Body)
 		strBody := string(body)
 		resp.Body.Close()
 		if err != nil {
 			t.Errorf("GET %s: failed to read body: %s (response: %v)", url, err, resp)
 		}
 		isErr := false
 		for _, substr := range test.contains {
 			if test.releaseTag != "" && !hasTag(test.releaseTag) {
 				continue
 			}
 			if !bytes.Contains(body, []byte(substr)) {
 				t.Errorf("GET %s: wanted substring %q in body", url, substr)
 				isErr = true
 			}
 		}
 		for _, re := range test.match {
 			if test.releaseTag != "" && !hasTag(test.releaseTag) {
 				continue
 			}
 			if ok, err := regexp.MatchString(re, strBody); !ok || err != nil {
 				if err != nil {
 					t.Fatalf("Bad regexp %q: %v", re, err)
 				}
 				t.Errorf("GET %s: wanted to match %s in body", url, re)
 				isErr = true
 			}
 		}
 		for _, substr := range test.notContains {
 			if bytes.Contains(body, []byte(substr)) {
 				t.Errorf("GET %s: didn't want substring %q in body", url, substr)
 				isErr = true
 			}
 		}
 		if isErr {
 			t.Errorf("GET %s: got:\n%s", url, body)
 		}
 	}
 }

 // Test for golang.org/issue/35476.
 func TestNoMainModule(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping test in -short mode")
 	}
 	if runtime.GOOS == "plan9" {
 		t.Skip("skipping on plan9; for consistency with other tests that build godoc binary")
 	}
 	bin := godocPath(t)
 	tempDir := t.TempDir()

 	// Run godoc in an empty directory with module mode explicitly on,
 	// so that 'go env GOMOD' reports os.DevNull.
 	cmd := testenv.Command(t, bin, "-url=/")
 	cmd.Dir = tempDir
 	cmd.Env = append(os.Environ(), "GO111MODULE=on")
 	var stderr bytes.Buffer
 	cmd.Stderr = &stderr
 	err := cmd.Run()
 	if err != nil {
 		t.Fatalf("godoc command failed: %v\nstderr=%q", err, stderr.String())
 	}
 	if strings.Contains(stderr.String(), "go mod download") {
 		t.Errorf("stderr contains 'go mod download', is that intentional?\nstderr=%q", stderr.String())
 	}
 }
	// Copyright 2013 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package main

	import (
	"bytes"
	"context"
	"fmt"
	"go/build"
	"io/ioutil"
	"net"
	"net/http"
	"os"
	"os/exec"
	"regexp"
	"runtime"
	"strings"
	"sync"
	"testing"
	"time"

	"golang.org/x/tools/go/packages/packagestest"
	"golang.org/x/tools/internal/testenv"
	)

	func TestMain(m *testing.M) {
	if os.Getenv("GODOC_TEST_IS_GODOC") != "" {
	main()
	os.Exit(0)
	}

	// Inform subprocesses that they should run the cmd/godoc main instead of
	// running tests. It's a close approximation to building and running the real
	// command, and much less complicated and expensive to build and clean up.
	os.Setenv("GODOC_TEST_IS_GODOC", "1")

	os.Exit(m.Run())
	}

	var exe struct {
	path string
	err error
	once sync.Once
	}

	func godocPath(t *testing.T) string {
	if !testenv.HasExec() {
	t.Skipf("skipping test that requires exec")
	}

	exe.once.Do(func() {
	exe.path, exe.err = os.Executable()
	})
	if exe.err != nil {
	t.Fatal(exe.err)
	}
	return exe.path
	}

	func serverAddress(t *testing.T) string {
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
	ln, err = net.Listen("tcp6", "[::1]:0")
	}
	if err != nil {
	t.Fatal(err)
	}
	defer ln.Close()
	return ln.Addr().String()
	}

	func waitForServerReady(t testing.T, ctx context.Context, cmd exec.Cmd, addr string) {
	waitForServer(t, ctx,
	fmt.Sprintf("http://%v/", addr),
	"Go Documentation Server",
	false)
	}

	func waitForSearchReady(t testing.T, ctx context.Context, cmd exec.Cmd, addr string) {
	waitForServer(t, ctx,
	fmt.Sprintf("http://%v/search?q=FALLTHROUGH", addr),
	"The list of tokens.",
	false)
	}

	func waitUntilScanComplete(t *testing.T, ctx context.Context, addr string) {
	waitForServer(t, ctx,
	fmt.Sprintf("http://%v/pkg", addr),
	"Scan is not yet complete",
	// setting reverse as true, which means this waits
	// until the string is not returned in the response anymore
	true)
	}

	const pollInterval = 50 * time.Millisecond

	// waitForServer waits for server to meet the required condition,
	// failing the test if ctx is canceled before that occurs.
	func waitForServer(t *testing.T, ctx context.Context, url, match string, reverse bool) {
	start := time.Now()
	for {
	if ctx.Err() != nil {
	t.Helper()
	t.Fatalf("server failed to respond in %v", time.Since(start))
	}

	time.Sleep(pollInterval)
	res, err := http.Get(url)
	if err != nil {
	continue
	}
	body, err := ioutil.ReadAll(res.Body)
	res.Body.Close()
	if err != nil \|\| res.StatusCode != http.StatusOK {
	continue
	}
	switch {
	case !reverse && bytes.Contains(body, []byte(match)),
	reverse && !bytes.Contains(body, []byte(match)):
	return
	}
	}
	}

	// hasTag checks whether a given release tag is contained in the current version
	// of the go binary.
	func hasTag(t string) bool {
	for _, v := range build.Default.ReleaseTags {
	if t == v {
	return true
	}
	}
	return false
	}

	func TestURL(t *testing.T) {
	if runtime.GOOS == "plan9" {
	t.Skip("skipping on plan9; fails to start up quickly enough")
	}
	bin := godocPath(t)

	testcase := func(url string, contents string) func(t *testing.T) {
	return func(t *testing.T) {
	stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)

	args := []string{fmt.Sprintf("-url=%s", url)}
	cmd := testenv.Command(t, bin, args...)
	cmd.Stdout = stdout
	cmd.Stderr = stderr
	cmd.Args[0] = "godoc"

	// Set GOPATH variable to a non-existing absolute path
	// and GOPROXY=off to disable module fetches.
	// We cannot just unset GOPATH variable because godoc would default it to ~/go.
	// (We don't want the indexer looking at the local workspace during tests.)
	cmd.Env = append(os.Environ(),
	"GOPATH=/does_not_exist",
	"GOPROXY=off",
	"GO111MODULE=off")

	if err := cmd.Run(); err != nil {
	t.Fatalf("failed to run godoc -url=%q: %s\nstderr:\n%s", url, err, stderr)
	}

	if !strings.Contains(stdout.String(), contents) {
	t.Errorf("did not find substring %q in output of godoc -url=%q:\n%s", contents, url, stdout)
	}
	}
	}

	t.Run("index", testcase("/", "These packages are part of the Go Project but outside the main Go tree."))
	t.Run("fmt", testcase("/pkg/fmt", "Package fmt implements formatted I/O"))
	}

	// Basic integration test for godoc HTTP interface.
	func TestWeb(t *testing.T) {
	bin := godocPath(t)

	for _, x := range packagestest.All {
	t.Run(x.Name(), func(t *testing.T) {
	testWeb(t, x, bin, false)
	})
	}
	}

	// Basic integration test for godoc HTTP interface.
	func TestWebIndex(t *testing.T) {
	if testing.Short() {
	t.Skip("skipping slow test in -short mode")
	}
	bin := godocPath(t)
	testWeb(t, packagestest.GOPATH, bin, true)
	}

	// Basic integration test for godoc HTTP interface.
	func testWeb(t *testing.T, x packagestest.Exporter, bin string, withIndex bool) {
	switch runtime.GOOS {
	case "plan9":
	t.Skip("skipping on plan9: fails to start up quickly enough")
	case "android", "ios":
	t.Skip("skipping on mobile: lacks GOROOT/api in test environment")
	}

	// Write a fake GOROOT/GOPATH with some third party packages.
	e := packagestest.Export(t, x, []packagestest.Module{
	{
	Name: "godoc.test/repo1",
	Files: map[string]interface{}{
	"a/a.go": `// Package a is a package in godoc.test/repo1.
	package a; import _ "godoc.test/repo2/a"; const Name = "repo1a"`,
	"b/b.go": `package b; const Name = "repo1b"`,
	},
	},
	{
	Name: "godoc.test/repo2",
	Files: map[string]interface{}{
	"a/a.go": `package a; const Name = "repo2a"`,
	"b/b.go": `package b; const Name = "repo2b"`,
	},
	},
	})
	defer e.Cleanup()

	// Start the server.
	addr := serverAddress(t)
	args := []string{fmt.Sprintf("-http=%s", addr)}
	if withIndex {
	args = append(args, "-index", "-index_interval=-1s")
	}
	cmd := testenv.Command(t, bin, args...)
	cmd.Dir = e.Config.Dir
	cmd.Env = e.Config.Env
	cmdOut := new(strings.Builder)
	cmd.Stdout = cmdOut
	cmd.Stderr = cmdOut
	cmd.Args[0] = "godoc"

	if err := cmd.Start(); err != nil {
	t.Fatalf("failed to start godoc: %s", err)
	}
	ctx, cancel := context.WithCancel(context.Background())
	go func() {
	err := cmd.Wait()
	t.Logf("%v: %v", cmd, err)
	cancel()
	}()
	defer func() {
	// Shut down the server cleanly if possible.
	if runtime.GOOS == "windows" {
	cmd.Process.Kill() // Windows doesn't support os.Interrupt.
	} else {
	cmd.Process.Signal(os.Interrupt)
	}
	<-ctx.Done()
	t.Logf("server output:\n%s", cmdOut)
	}()

	if withIndex {
	waitForSearchReady(t, ctx, cmd, addr)
	} else {
	waitForServerReady(t, ctx, cmd, addr)
	waitUntilScanComplete(t, ctx, addr)
	}

	tests := []struct {
	path string
	contains []string // substring
	match []string // regexp
	notContains []string
	needIndex bool
	releaseTag string // optional release tag that must be in go/build.ReleaseTags
	}{
	{
	path: "/",
	contains: []string{
	"Go Documentation Server",
	"Standard library",
	"These packages are part of the Go Project but outside the main Go tree.",
	},
	},
	{
	path: "/pkg/fmt/",
	contains: []string{"Package fmt implements formatted I/O"},
	},
	{
	path: "/src/fmt/",
	contains: []string{"scan_test.go"},
	},
	{
	path: "/src/fmt/print.go",
	contains: []string{"// Println formats using"},
	},
	{
	path: "/pkg",
	contains: []string{
	"Standard library",
	"Package fmt implements formatted I/O",
	"Third party",
	"Package a is a package in godoc.test/repo1.",
	},
	notContains: []string{
	"internal/syscall",
	"cmd/gc",
	},
	},
	{
	path: "/pkg/?m=all",
	contains: []string{
	"Standard library",
	"Package fmt implements formatted I/O",
	"internal/syscall/?m=all",
	},
	notContains: []string{
	"cmd/gc",
	},
	},
	{
	path: "/search?q=ListenAndServe",
	contains: []string{
	"/src",
	},
	notContains: []string{
	"/pkg/bootstrap",
	},
	needIndex: true,
	},
	{
	path: "/pkg/strings/",
	contains: []string{
	`href="/src/strings/strings.go"`,
	},
	},
	{
	path: "/cmd/compile/internal/amd64/",
	contains: []string{
	`href="/src/cmd/compile/internal/amd64/ssa.go"`,
	},
	},
	{
	path: "/pkg/math/bits/",
	contains: []string{
	`Added in Go 1.9`,
	},
	},
	{
	path: "/pkg/net/",
	contains: []string{
	`// IPv6 scoped addressing zone; added in Go 1.1`,
	},
	},
	{
	path: "/pkg/net/http/httptrace/",
	match: []string{
	`Got1xxResponse.*// Go 1\.11`,
	},
	releaseTag: "go1.11",
	},
	// Verify we don't add version info to a struct field added the same time
	// as the struct itself:
	{
	path: "/pkg/net/http/httptrace/",
	match: []string{
	`(?m)GotFirstResponseByte func\(\)\s*$`,
	},
	},
	// Remove trailing periods before adding semicolons:
	{
	path: "/pkg/database/sql/",
	contains: []string{
	"The number of connections currently in use; added in Go 1.11",
	"The number of idle connections; added in Go 1.11",
	},
	releaseTag: "go1.11",
	},

	// Third party packages.
	{
	path: "/pkg/godoc.test/repo1/a",
	contains: []string{`const <span id="Name">Name</span> = "repo1a"`},
	},
	{
	path: "/pkg/godoc.test/repo2/b",
	contains: []string{`const <span id="Name">Name</span> = "repo2b"`},
	},
	}
	for _, test := range tests {
	if test.needIndex && !withIndex {
	continue
	}
	url := fmt.Sprintf("http://%s%s", addr, test.path)
	resp, err := http.Get(url)
	if err != nil {
	t.Errorf("GET %s failed: %s", url, err)
	continue
	}
	body, err := ioutil.ReadAll(resp.Body)
	strBody := string(body)
	resp.Body.Close()
	if err != nil {
	t.Errorf("GET %s: failed to read body: %s (response: %v)", url, err, resp)
	}
	isErr := false
	for _, substr := range test.contains {
	if test.releaseTag != "" && !hasTag(test.releaseTag) {
	continue
	}
	if !bytes.Contains(body, []byte(substr)) {
	t.Errorf("GET %s: wanted substring %q in body", url, substr)
	isErr = true
	}
	}
	for _, re := range test.match {
	if test.releaseTag != "" && !hasTag(test.releaseTag) {
	continue
	}
	if ok, err := regexp.MatchString(re, strBody); !ok \|\| err != nil {
	if err != nil {
	t.Fatalf("Bad regexp %q: %v", re, err)
	}
	t.Errorf("GET %s: wanted to match %s in body", url, re)
	isErr = true
	}
	}
	for _, substr := range test.notContains {
	if bytes.Contains(body, []byte(substr)) {
	t.Errorf("GET %s: didn't want substring %q in body", url, substr)
	isErr = true
	}
	}
	if isErr {
	t.Errorf("GET %s: got:\n%s", url, body)
	}
	}
	}

	// Test for golang.org/issue/35476.
	func TestNoMainModule(t *testing.T) {
	if testing.Short() {
	t.Skip("skipping test in -short mode")
	}
	if runtime.GOOS == "plan9" {
	t.Skip("skipping on plan9; for consistency with other tests that build godoc binary")
	}
	bin := godocPath(t)
	tempDir := t.TempDir()

	// Run godoc in an empty directory with module mode explicitly on,
	// so that 'go env GOMOD' reports os.DevNull.
	cmd := testenv.Command(t, bin, "-url=/")
	cmd.Dir = tempDir
	cmd.Env = append(os.Environ(), "GO111MODULE=on")
	var stderr bytes.Buffer
	cmd.Stderr = &stderr
	err := cmd.Run()
	if err != nil {
	t.Fatalf("godoc command failed: %v\nstderr=%q", err, stderr.String())
	}
	if strings.Contains(stderr.String(), "go mod download") {
	t.Errorf("stderr contains 'go mod download', is that intentional?\nstderr=%q", stderr.String())
	}
	}