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waitgroup_test.go
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waitgroup_test.go
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package conc
import (
"fmt"
"sync/atomic"
"testing"
"github.com/stretchr/testify/require"
)
func ExampleWaitGroup() {
var count atomic.Int64
var wg WaitGroup
for i := 0; i < 10; i++ {
wg.Go(func() {
count.Add(1)
})
}
wg.Wait()
fmt.Println(count.Load())
// Output:
// 10
}
func TestWaitGroup(t *testing.T) {
t.Parallel()
t.Run("ctor", func(t *testing.T) {
t.Parallel()
wg := NewWaitGroup()
require.IsType(t, &WaitGroup{}, wg)
})
t.Run("all spawned run", func(t *testing.T) {
t.Parallel()
var count atomic.Int64
var wg WaitGroup
for i := 0; i < 100; i++ {
wg.Go(func() {
count.Add(1)
})
}
wg.Wait()
require.Equal(t, count.Load(), int64(100))
})
t.Run("panic", func(t *testing.T) {
t.Parallel()
t.Run("is propagated", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
wg.Go(func() {
panic("super bad thing")
})
require.Panics(t, wg.Wait)
})
t.Run("one is propagated", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
wg.Go(func() {
panic("super bad thing")
})
wg.Go(func() {
panic("super badder thing")
})
require.Panics(t, wg.Wait)
})
t.Run("nonpanics do not overwrite panic", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
wg.Go(func() {
panic("super bad thing")
})
for i := 0; i < 10; i++ {
wg.Go(func() {})
}
require.Panics(t, wg.Wait)
})
t.Run("nonpanics run successfully", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
var i atomic.Int64
wg.Go(func() {
i.Add(1)
})
wg.Go(func() {
panic("super bad thing")
})
wg.Go(func() {
i.Add(1)
})
require.Panics(t, wg.Wait)
require.Equal(t, int64(2), i.Load())
})
t.Run("is caught by waitandrecover", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
wg.Go(func() {
panic("super bad thing")
})
p := wg.WaitAndRecover()
require.Equal(t, p.Value, "super bad thing")
})
t.Run("one is caught by waitandrecover", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
wg.Go(func() {
panic("super bad thing")
})
wg.Go(func() {
panic("super badder thing")
})
p := wg.WaitAndRecover()
require.NotNil(t, p)
})
t.Run("nonpanics run successfully with waitandrecover", func(t *testing.T) {
t.Parallel()
var wg WaitGroup
var i atomic.Int64
wg.Go(func() {
i.Add(1)
})
wg.Go(func() {
panic("super bad thing")
})
wg.Go(func() {
i.Add(1)
})
p := wg.WaitAndRecover()
require.Equal(t, p.Value, "super bad thing")
require.Equal(t, int64(2), i.Load())
})
})
}