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// Copyright 2016 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 testdeps provides access to dependencies needed by test execution.
//
// This package is imported by the generated main package, which passes
// TestDeps into testing.Main. This allows tests to use packages at run time
// without making those packages direct dependencies of package testing.
// Direct dependencies of package testing are harder to write tests for.
package testdeps
import (
"bufio"
"internal/testlog"
"io"
"regexp"
"runtime/pprof"
"strings"
"sync"
)
// TestDeps is an implementation of the testing.testDeps interface,
// suitable for passing to testing.MainStart.
type TestDeps struct{}
var matchPat string
var matchRe *regexp.Regexp
func (TestDeps) MatchString(pat, str string) (result bool, err error) {
if matchRe == nil || matchPat != pat {
matchPat = pat
matchRe, err = regexp.Compile(matchPat)
if err != nil {
return
}
}
return matchRe.MatchString(str), nil
}
func (TestDeps) StartCPUProfile(w io.Writer) error {
return pprof.StartCPUProfile(w)
}
func (TestDeps) StopCPUProfile() {
pprof.StopCPUProfile()
}
func (TestDeps) WriteProfileTo(name string, w io.Writer, debug int) error {
return pprof.Lookup(name).WriteTo(w, debug)
}
// ImportPath is the import path of the testing binary, set by the generated main function.
var ImportPath string
func (TestDeps) ImportPath() string {
return ImportPath
}
// testLog implements testlog.Interface, logging actions by package os.
type testLog struct {
mu sync.Mutex
w *bufio.Writer
set bool
}
func (l *testLog) Getenv(key string) {
l.add("getenv", key)
}
func (l *testLog) Open(name string) {
l.add("open", name)
}
func (l *testLog) Stat(name string) {
l.add("stat", name)
}
func (l *testLog) Chdir(name string) {
l.add("chdir", name)
}
// add adds the (op, name) pair to the test log.
func (l *testLog) add(op, name string) {
if strings.Contains(name, "\n") || name == "" {
return
}
l.mu.Lock()
defer l.mu.Unlock()
if l.w == nil {
return
}
l.w.WriteString(op)
l.w.WriteByte(' ')
l.w.WriteString(name)
l.w.WriteByte('\n')
}
var log testLog
func (TestDeps) StartTestLog(w io.Writer) {
log.mu.Lock()
log.w = bufio.NewWriter(w)
if !log.set {
// Tests that define TestMain and then run m.Run multiple times
// will call StartTestLog/StopTestLog multiple times.
// Checking log.set avoids calling testlog.SetLogger multiple times
// (which will panic) and also avoids writing the header multiple times.
log.set = true
testlog.SetLogger(&log)
log.w.WriteString("# test log\n") // known to cmd/go/internal/test/test.go
}
log.mu.Unlock()
}
func (TestDeps) StopTestLog() error {
log.mu.Lock()
defer log.mu.Unlock()
err := log.w.Flush()
log.w = nil
return err
}
// SetPanicOnExit0 tells the os package whether to panic on os.Exit(0).
func (TestDeps) SetPanicOnExit0(v bool) {
testlog.SetPanicOnExit0(v)
}
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