package hello

func hello() string {
 words := []string{"hello", "func", "in", "package", "hello"}
 wl := len(words)

 sentence := ""
 for key, word := range words {
  sentence += word
  if key < wl-1 {
   sentence += " "
  } else {
   sentence += "."
  }
 }
 return sentence
}

package hello

import (
 "fmt"
 "testing"
)

func TestHello(t *testing.T) {
 got := hello()
 expect := "hello func in package hello."

 if got != expect {
  t.Errorf("got [%s] expected [%s]", got, expect)
 }
}

func BenchmarkHello(b *testing.B) {
 for i := 0; i < b.N; i++ {
  hello()
 }
}

func ExampleHello() {
 hl := hello()
 fmt.Println(hl)
 // Output: hello func in package hello.
}

PASS
ok  hello 0.007s

# /usr/local/go/src/bytes/compare_test.go
func TestCompareIdenticalSlice(t *testing.T) {
 var b = []byte("Hello Gophers!")
 if Compare(b, b) != 0 {
  t.Error("b != b")
 }
 if Compare(b, b[:1]) != 1 {
  t.Error("b > b[:1] failed")
 }
}

# /usr/local/go/src/bytes/reader_test.go
func TestReadAfterBigSeek(t *testing.T) {
 r := NewReader([]byte("0123456789"))
 if _, err := r.Seek(1<<31+5, os.SEEK_SET); err != nil {
  t.Fatal(err)
 }
 if n, err := r.Read(make([]byte, 10)); n != 0 || err != io.EOF {
  t.Errorf("Read = %d, %v; want 0, EOF", n, err)
 }
}

# /usr/local/go/src/archive/zip/zip_test.go
func TestZip64(t *testing.T) {
 if testing.Short() {
  t.Skip("slow test; skipping")
 }
 const size = 1 << 32 // before the "END\n" part
 buf := testZip64(t, size)
 testZip64DirectoryRecordLength(buf, t)
}

# /usr/local/go/src/regexp/exec_test.go
func TestFowler(t *testing.T) {
 files, err := filepath.Glob("testdata/*.dat")
 if err != nil {
  t.Fatal(err)
 }
 for _, file := range files {
  t.Log(file)
  testFowler(t, file)
 }
}

# /usr/local/go/src/runtime/stack_test.go
func TestStackGrowth(t *testing.T) {
 t.Parallel()
 var wg sync.WaitGroup

 // in a normal goroutine
 wg.Add(1)
 go func() {
  defer wg.Done()
  growStack()
 }()
 wg.Wait()

 // ...
}

# /usr/local/go/src/bufio/bufio_test.go
func BenchmarkWriterFlush(b *testing.B) {
 b.ReportAllocs()
 bw := NewWriter(ioutil.Discard)
 str := strings.Repeat("x", 50)
 for i := 0; i < b.N; i++ {
  bw.WriteString(str)
  bw.Flush()
 }
}

# /usr/local/go/src/fmt/scan_test.go
func BenchmarkScanInts(b *testing.B) {
 b.ResetTimer()
 ints := makeInts(intCount)
 var r RecursiveInt
 for i := b.N - 1; i >= 0; i-- {
  buf := bytes.NewBuffer(ints)
  b.StartTimer()
  scanInts(&r, buf)
  b.StopTimer()
 }
}

# /usr/local/go/src/testing/benchmark.go
func BenchmarkFields(b *testing.B) {
 b.SetBytes(int64(len(fieldsInput)))
 for i := 0; i < b.N; i++ {
  Fields(fieldsInput)
 }
}

# /usr/local/go/src/sync/atomic/value_test.go
func BenchmarkValueRead(b *testing.B) {
 var v Value
 v.Store(new(int))
 b.RunParallel(func(pb *testing.PB) {
  for pb.Next() {
   x := v.Load().(*int)
   if *x != 0 {
    b.Fatalf("wrong value: got %v, want 0", *x)
   }
  }
 })
}

# /usr/local/go/src/log/log_test.go:
import (
 "bytes"
 "fmt"
 "os"
 "regexp"
 "strings"
 "testing"
 "time"
)

# /usr/local/go/src/log/log_test.go:
const (
 Rdate   = `[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]`
 Rtime   = `[0-9][0-9]:[0-9][0-9]:[0-9][0-9]`
 Rmicroseconds = `\.[0-9][0-9][0-9][0-9][0-9][0-9]`
 Rline   = `(57|59):` // must update if the calls to l.Printf / l.Print below move
 Rlongfile  = `.*/[A-Za-z0-9_\-]+\.go:` + Rline
 Rshortfile = `[A-Za-z0-9_\-]+\.go:` + Rline
)

// ...

var tests = []tester{
 // individual pieces:
 {0, "", ""},
 {0, "XXX", "XXX"},
 {Ldate, "", Rdate + " "},
 {Ltime, "", Rtime + " "},
 {Ltime | Lmicroseconds, "", Rtime + Rmicroseconds + " "},
 {Lmicroseconds, "", Rtime + Rmicroseconds + " "}, // microsec implies time
 {Llongfile, "", Rlongfile + " "},
 {Lshortfile, "", Rshortfile + " "},
 {Llongfile | Lshortfile, "", Rshortfile + " "}, // shortfile overrides longfile
 // everything at once:
 {Ldate | Ltime | Lmicroseconds | Llongfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rlongfile + " "},
 {Ldate | Ltime | Lmicroseconds | Lshortfile, "XXX", "XXX" + Rdate + " " + Rtime + Rmicroseconds + " " + Rshortfile + " "},
}

# /usr/local/go/src/bytes/buffer_test.go
func init() {
 testBytes = make([]byte, N)
 for i := 0; i < N; i++ {
  testBytes[i] = 'a' + byte(i%26)
 }
 data = string(testBytes)
}

# /usr/local/go/src/log/log_test.go:
type tester struct {
 flag int
 prefix string
 pattern string // regexp that log output must match; we add ^ and expected_text$ always
}

// ...

func testPrint(t *testing.T, flag int, prefix string, pattern string, useFormat bool) {
 // ...
}

func Example() { ... }  # 包的示例函数
func ExampleF() { ... }  # 函数F的示例函数
func ExampleT() { ... }  # 类型T的示例函数
func ExampleT_M() { ... } # 类型T的M方法的示例函数

# 多示例函数 需要跟下划线加小写字母开头的后缀
func Example_suffix() { ... }
func ExampleF_suffix() { ... }
func ExampleT_suffix() { ... }
func ExampleT_M_suffix() { ... }

[tabalt@localhost hello] go test -v
=== RUN TestHello
--- PASS: TestHello (0.00s)
=== RUN ExampleHello
--- PASS: ExampleHello (0.00s)
PASS
ok  hello 0.006s

[tabalt@localhost hello] go test -v -run=xxx
PASS
ok  hello 0.006s

[tabalt@localhost hello] go test -bench=.
PASS
BenchmarkHello-8  2000000   657 ns/op
ok  hello 1.993s

[tabalt@localhost hello] go test -bench=. -benchmem
PASS
BenchmarkHello-8  2000000   666 ns/op   208 B/op   9 allocs/op
ok  hello 2.014s

# /usr/local/go/src/math/big/int_test.go
func checkMul(a, b []byte) bool {
 var x, y, z1 Int
 x.SetBytes(a)
 y.SetBytes(b)
 z1.Mul(&x, &y)

 var z2 Int
 z2.SetBytes(mulBytes(a, b))

 return z1.Cmp(&z2) == 0
}

func TestMul(t *testing.T) {
 if err := quick.Check(checkMul, nil); err != nil {
  t.Error(err)
 }
}

func CheckEqual(f, g interface{}, config *Config) (err error)

ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 fmt.Fprintln(w, "Hello, client")
}))
defer ts.Close()

res, err := http.Get(ts.URL)
if err != nil {
 log.Fatal(err)
}

greeting, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
 log.Fatal(err)
}

fmt.Printf("%s", greeting)

handler := func(w http.ResponseWriter, r *http.Request) {
 http.Error(w, "something failed", http.StatusInternalServerError)
}

req, err := http.NewRequest("GET", "http://example.com/foo", nil)
if err != nil {
 log.Fatal(err)
}

w := httptest.NewRecorder()
handler(w, req)

fmt.Printf("%d - %s", w.Code, w.Body.String())

//被测试的进程退出函数
func Crasher() {
 fmt.Println("Going down in flames!")
 os.Exit(1)
}

//测试进程退出函数的测试函数
func TestCrasher(t *testing.T) {
 if os.Getenv("BE_CRASHER") == "1" {
  Crasher()
  return
 }
 cmd := exec.Command(os.Args[0], "-test.run=TestCrasher")
 cmd.Env = append(os.Environ(), "BE_CRASHER=1")
 err := cmd.Run()
 if e, ok := err.(*exec.ExitError); ok && !e.Success() {
  return
 }
 t.Fatalf("process ran with err %v, want exit status 1", err)
}