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// Copyright 2022 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 coverage
import (
"encoding/json"
"internal/coverage"
"internal/goexperiment"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
_ "unsafe"
)
//go:linkname testing_testGoCoverDir testing.testGoCoverDir
func testing_testGoCoverDir() string
func testGoCoverDir(t *testing.T) string {
tgcd := testing_testGoCoverDir()
if tgcd != "" {
return tgcd
}
return t.TempDir()
}
// TestTestSupport does a basic verification of the functionality in
// runtime/coverage.processCoverTestDir (doing this here as opposed to
// relying on other test paths will provide a better signal when
// running "go test -cover" for this package).
func TestTestSupport(t *testing.T) {
if !goexperiment.CoverageRedesign {
return
}
if testing.CoverMode() == "" {
return
}
tgcd := testGoCoverDir(t)
t.Logf("testing.testGoCoverDir() returns %s mode=%s\n",
tgcd, testing.CoverMode())
textfile := filepath.Join(t.TempDir(), "file.txt")
var sb strings.Builder
err := processCoverTestDirInternal(tgcd, textfile,
testing.CoverMode(), "", &sb)
if err != nil {
t.Fatalf("bad: %v", err)
}
// Check for existence of text file.
if inf, err := os.Open(textfile); err != nil {
t.Fatalf("problems opening text file %s: %v", textfile, err)
} else {
inf.Close()
}
// Check for percent output with expected tokens.
strout := sb.String()
want := "of statements"
if !strings.Contains(strout, want) {
t.Logf("output from run: %s\n", strout)
t.Fatalf("percent output missing token: %q", want)
}
}
var funcInvoked bool
//go:noinline
func thisFunctionOnlyCalledFromSnapshotTest(n int) int {
if funcInvoked {
panic("bad")
}
funcInvoked = true
// Contents here not especially important, just so long as we
// have some statements.
t := 0
for i := 0; i < n; i++ {
for j := 0; j < i; j++ {
t += i ^ j
}
}
return t
}
// Tests runtime/coverage.snapshot() directly. Note that if
// coverage is not enabled, the hook is designed to just return
// zero.
func TestCoverageSnapshot(t *testing.T) {
C1 := snapshot()
thisFunctionOnlyCalledFromSnapshotTest(15)
C2 := snapshot()
cond := "C1 > C2"
val := C1 > C2
if testing.CoverMode() != "" {
cond = "C1 >= C2"
val = C1 >= C2
}
t.Logf("%f %f\n", C1, C2)
if val {
t.Errorf("erroneous snapshots, %s = true C1=%f C2=%f",
cond, C1, C2)
}
}
const hellogo = `
package main
func main() {
println("hello")
}
`
// Returns a pair F,T where F is a meta-data file generated from
// "hello.go" above, and T is a token to look for that should be
// present in the coverage report from F.
func genAuxMeta(t *testing.T, dstdir string) (string, string) {
// Do a GOCOVERDIR=<tmp> go run hello.go
src := filepath.Join(dstdir, "hello.go")
if err := os.WriteFile(src, []byte(hellogo), 0777); err != nil {
t.Fatalf("write failed: %v", err)
}
args := []string{"run", "-covermode=" + testing.CoverMode(), src}
cmd := exec.Command(testenv.GoToolPath(t), args...)
cmd.Env = updateGoCoverDir(os.Environ(), dstdir, true)
if b, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("go run failed (%v): %s", err, b)
}
// Pick out the generated meta-data file.
files, err := os.ReadDir(dstdir)
if err != nil {
t.Fatalf("reading %s: %v", dstdir, err)
}
for _, f := range files {
if strings.HasPrefix(f.Name(), "covmeta") {
return filepath.Join(dstdir, f.Name()), "hello.go:"
}
}
t.Fatalf("could not locate generated meta-data file")
return "", ""
}
func TestAuxMetaDataFiles(t *testing.T) {
if !goexperiment.CoverageRedesign {
return
}
if testing.CoverMode() == "" {
return
}
testenv.MustHaveGoRun(t)
tgcd := testGoCoverDir(t)
t.Logf("testing.testGoCoverDir() returns %s mode=%s\n",
tgcd, testing.CoverMode())
td := t.TempDir()
// Manufacture a new, separate meta-data file not related to this
// test. Contents are not important, just so long as the
// packages/paths are different.
othermetadir := filepath.Join(td, "othermeta")
if err := os.Mkdir(othermetadir, 0777); err != nil {
t.Fatalf("mkdir failed: %v", err)
}
mfile, token := genAuxMeta(t, othermetadir)
// Write a metafiles file.
metafiles := filepath.Join(tgcd, coverage.MetaFilesFileName)
mfc := coverage.MetaFileCollection{
ImportPaths: []string{"command-line-arguments"},
MetaFileFragments: []string{mfile},
}
jdata, err := json.Marshal(mfc)
if err != nil {
t.Fatalf("marshal MetaFileCollection: %v", err)
}
if err := os.WriteFile(metafiles, jdata, 0666); err != nil {
t.Fatalf("write failed: %v", err)
}
// Kick off guts of test.
var sb strings.Builder
textfile := filepath.Join(td, "file2.txt")
err = processCoverTestDirInternal(tgcd, textfile,
testing.CoverMode(), "", &sb)
if err != nil {
t.Fatalf("bad: %v", err)
}
if err = os.Remove(metafiles); err != nil {
t.Fatalf("removing metafiles file: %v", err)
}
// Look for the expected things in the coverage profile.
contents, err := os.ReadFile(textfile)
strc := string(contents)
if err != nil {
t.Fatalf("problems reading text file %s: %v", textfile, err)
}
if !strings.Contains(strc, token) {
t.Logf("content: %s\n", string(contents))
t.Fatalf("cov profile does not contain aux meta content %q", token)
}
}
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