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// Package test provides testing utilities.
package test
import (
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"runtime"
"testing"
)
// Assembles asserts that the given assembly code passes the go assembler.
func Assembles(t *testing.T, asm []byte) {
t.Helper()
dir, clean := TempDir(t)
defer clean()
asmfilename := filepath.Join(dir, "asm.s")
if err := ioutil.WriteFile(asmfilename, asm, 0600); err != nil {
t.Fatal(err)
}
objfilename := filepath.Join(dir, "asm.o")
goexec(t, "tool", "asm", "-e", "-o", objfilename, asmfilename)
}
// TempDir creates a temp directory. Returns the path to the directory and a
// cleanup function.
func TempDir(t *testing.T) (string, func()) {
t.Helper()
dir, err := ioutil.TempDir("", "avo")
if err != nil {
t.Fatal(err)
}
return dir, func() {
if err := os.RemoveAll(dir); err != nil {
t.Fatal(err)
}
}
}
// ExecCommand executes the command, logging the command and output and failing
// the test on error.
func ExecCommand(t *testing.T, cmd *exec.Cmd) {
t.Helper()
t.Logf("exec: %s", cmd.Args)
if cmd.Dir != "" {
t.Logf("dir: %s", cmd.Dir)
}
b, err := cmd.CombinedOutput()
t.Logf("output:\n%s\n", string(b))
if err != nil {
t.Fatal(err)
}
}
// Exec executes the named program with the given arguments, logging the command
// and output and failing the test on error.
func Exec(t *testing.T, name string, arg ...string) {
t.Helper()
cmd := exec.Command(name, arg...)
ExecCommand(t, cmd)
}
// GoTool returns a best guess path to the "go" binary.
func GoTool() string {
var exeSuffix string
if runtime.GOOS == "windows" {
exeSuffix = ".exe"
}
path := filepath.Join(runtime.GOROOT(), "bin", "go"+exeSuffix)
if _, err := os.Stat(path); err == nil {
return path
}
return "go"
}
// goexec runs a "go" command and checks the output.
func goexec(t *testing.T, arg ...string) {
Exec(t, GoTool(), arg...)
}
// Logger builds a logger that writes to the test object.
func Logger(tb testing.TB) *log.Logger {
return log.New(Writer(tb), "test", log.LstdFlags)
}
type writer struct {
tb testing.TB
}
// Writer builds a writer that logs all writes to the test object.
func Writer(tb testing.TB) io.Writer {
return writer{tb}
}
func (w writer) Write(p []byte) (n int, err error) {
w.tb.Log(string(p))
return len(p), nil
}
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