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package comprehensive
import (
"fmt"
"testing"
"time"
selecttools "github.com/gainovel/testcase/stdlib/runtime/select/tools"
commonprint "github.com/gainovel/testcase/tools/common/print"
)
var (
myfmt = commonprint.MyFmt
)
func TestName_2024_03_13_10_44_15(t *testing.T) {
// select的case语句基本特点
// go test -v -run TestName_2024_03_13_10_44_15/case1 github.com/gainovel/testcase/stdlib/runtime/select/features_and_usages/comprehensive
t.Run("case1", func(t *testing.T) {
var (
ch1 chan int
ch2 chan int
)
ch1 = make(chan int, 2)
ch2 = make(chan int)
myfmt.VarInitPrintln(` var (
ch1 chan int
ch2 chan int
)
ch1 = make(chan int, 2)
ch2 = make(chan int)`)
myfmt.ColorDescPrintln("go tools.SendToIntChan(ch2)", `func SendToIntChanNTimes(ch chan int, n int) {
for i := 0; i < n; i++ {
ch <- i
time.Sleep(time.Second)
}
}`)
go selecttools.SendToIntChanNTimes(ch2, 3)
label1:
for {
select {
case ch1 <- 1:
myfmt.ColorDescPrintln("进入case ch1 <- 1")
myfmt.KeyValuePrintln("len(ch1)", len(ch1), "cap(ch1)", cap(ch1))
val, ok := <-ch1
myfmt.ColorDescPrintln("val, ok := <-ch1")
myfmt.KeyValuePrintln("len(ch1)", len(ch1), "cap(ch1)", cap(ch1), "val", val, "ok", ok)
time.Sleep(time.Second)
case val, ok := <-ch2:
myfmt.ColorDescPrintln("进入case val, ok := <-ch2")
myfmt.KeyValuePrintln("len(ch2)", len(ch2), "cap(ch2)", cap(ch2), "val", val, "ok", ok)
if val == 2 {
break label1
}
time.Sleep(time.Second)
default:
fmt.Println("进入case default")
}
}
})
t.Run("read block", func(t *testing.T) {
var (
ch1 chan int
)
ch1 = make(chan int, 2)
// 如果没有一个goroutine在运行，go进程会停止，
// 所以这里放一个sleep goroutine
go selecttools.SleepGoroutineNMinute(5)
// ch1缓冲区无数据，select会阻塞
select {
case <-ch1:
myfmt.ColorDescPrintln("进入 case <-ch1")
}
})
}
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