blob: 81ac8ae467775d070370cb793d75b71f98f68042 [file] [log] [blame]
// 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_test
import (
"bytes"
"fmt"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"testing"
)
const (
// Data directory, also the package directory for the test.
testdata = "testdata"
// Binaries we compile.
testcover = "./testcover.exe"
)
var (
// Files we use.
testMain = filepath.Join(testdata, "main.go")
testTest = filepath.Join(testdata, "test.go")
coverInput = filepath.Join(testdata, "test_line.go")
coverOutput = filepath.Join(testdata, "test_cover.go")
)
var debug = false // Keeps the rewritten files around if set.
// Run this shell script, but do it in Go so it can be run by "go test".
//
// replace the word LINE with the line number < testdata/test.go > testdata/test_line.go
// go build -o ./testcover
// ./testcover -mode=count -var=CoverTest -o ./testdata/test_cover.go testdata/test_line.go
// go run ./testdata/main.go ./testdata/test.go
//
func TestCover(t *testing.T) {
testenv.MustHaveGoBuild(t)
// Read in the test file (testTest) and write it, with LINEs specified, to coverInput.
file, err := ioutil.ReadFile(testTest)
if err != nil {
t.Fatal(err)
}
lines := bytes.Split(file, []byte("\n"))
for i, line := range lines {
lines[i] = bytes.Replace(line, []byte("LINE"), []byte(fmt.Sprint(i+1)), -1)
}
if err := ioutil.WriteFile(coverInput, bytes.Join(lines, []byte("\n")), 0666); err != nil {
t.Fatal(err)
}
// defer removal of test_line.go
if !debug {
defer os.Remove(coverInput)
}
// go build -o testcover
cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", testcover)
run(cmd, t)
// defer removal of testcover
defer os.Remove(testcover)
// ./testcover -mode=count -var=thisNameMustBeVeryLongToCauseOverflowOfCounterIncrementStatementOntoNextLineForTest -o ./testdata/test_cover.go testdata/test_line.go
cmd = exec.Command(testcover, "-mode=count", "-var=thisNameMustBeVeryLongToCauseOverflowOfCounterIncrementStatementOntoNextLineForTest", "-o", coverOutput, coverInput)
run(cmd, t)
// defer removal of ./testdata/test_cover.go
if !debug {
defer os.Remove(coverOutput)
}
// go run ./testdata/main.go ./testdata/test.go
cmd = exec.Command(testenv.GoToolPath(t), "run", testMain, coverOutput)
run(cmd, t)
file, err = ioutil.ReadFile(coverOutput)
if err != nil {
t.Fatal(err)
}
// compiler directive must appear right next to function declaration.
if got, err := regexp.MatchString(".*\n//go:nosplit\nfunc someFunction().*", string(file)); err != nil || !got {
t.Errorf("misplaced compiler directive: got=(%v, %v); want=(true; nil)", got, err)
}
// "go:linkname" compiler directive should be present.
if got, err := regexp.MatchString(`.*go\:linkname some\_name some\_name.*`, string(file)); err != nil || !got {
t.Errorf("'go:linkname' compiler directive not found: got=(%v, %v); want=(true; nil)", got, err)
}
// No other comments should be present in generated code.
c := ".*// This comment shouldn't appear in generated go code.*"
if got, err := regexp.MatchString(c, string(file)); err != nil || got {
t.Errorf("non compiler directive comment %q found. got=(%v, %v); want=(false; nil)", c, got, err)
}
}
func run(c *exec.Cmd, t *testing.T) {
c.Stdout = os.Stdout
c.Stderr = os.Stderr
err := c.Run()
if err != nil {
t.Fatal(err)
}
}