blob: 54d3465404d1347b3451c7f847221b513f4e0d26 [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.
// No testdata on Android.
// +build !android
package main_test
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"testing"
"golang.org/x/tools/internal/testenv"
)
const (
// Data directory, also the package directory for the test.
testdata = "testdata"
)
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.NeedsTool(t, "go")
tmpdir, err := ioutil.TempDir("", "TestCover")
if err != nil {
t.Fatal(err)
}
defer func() {
if debug {
fmt.Printf("test files left in %s\n", tmpdir)
} else {
os.RemoveAll(tmpdir)
}
}()
testcover := filepath.Join(tmpdir, "testcover.exe")
testMain := filepath.Join(tmpdir, "main.go")
testTest := filepath.Join(tmpdir, "test.go")
coverInput := filepath.Join(tmpdir, "test_line.go")
coverOutput := filepath.Join(tmpdir, "test_cover.go")
for _, f := range []string{testMain, testTest} {
data, err := ioutil.ReadFile(filepath.Join(testdata, filepath.Base(f)))
if err != nil {
t.Fatal(err)
}
if err := ioutil.WriteFile(f, data, 0644); err != nil {
t.Fatal(err)
}
}
// 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)
}
err = ioutil.WriteFile(coverInput, bytes.Join(lines, []byte("\n")), 0666)
if err != nil {
t.Fatal(err)
}
// go build -o testcover
cmd := exec.Command("go", "build", "-o", testcover)
run(cmd, t)
// ./testcover -mode=count -var=coverTest -o ./testdata/test_cover.go testdata/test_line.go
cmd = exec.Command(testcover, "-mode=count", "-var=coverTest", "-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("go", "run", testMain, coverOutput)
run(cmd, t)
}
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)
}
}