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package hunch
import (
"context"
"fmt"
"reflect"
"sync/atomic"
"testing"
"time"
)
type AppError struct {
}
func (err AppError) Error() string {
return "app error!"
}
type MultiReturns struct {
Val interface{}
Err error
}
func isSlice(v interface{}) bool {
rv := reflect.ValueOf(v)
return rv.Kind() == reflect.Slice
}
func TestTake_ShouldWorksAsExpected(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Take(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
<-time.After(300 * time.Millisecond)
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
rs := []int{}
for _, v := range r.Val.([]interface{}) {
rs = append(rs, v.(int))
}
equal := reflect.DeepEqual([]int{2, 1, 3}, rs)
if !equal {
t.Errorf("Execution order is wrong, gets: %+v\n", rs)
}
}
func TestTake_ShouldJustTakeAll(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Take(
rootCtx,
100,
func(ctx context.Context) (interface{}, error) {
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
rs := []int{}
for _, v := range r.Val.([]interface{}) {
rs = append(rs, v.(int))
}
if len(rs) != 3 {
t.Errorf("Should return 3 results, but gets: %+v\n", rs)
}
}
func TestTake_ShouldLimitResults(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Take(
rootCtx,
2,
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
<-time.After(300 * time.Millisecond)
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
rs := []int{}
for _, v := range r.Val.([]interface{}) {
rs = append(rs, v.(int))
}
equal := reflect.DeepEqual([]int{2, 1}, rs)
if !equal {
t.Errorf("Execution order is wrong, gets: %+v\n", rs)
}
}
func TestTake_ShouldCancelWhenOneExecutableReturnedError(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Take(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 0, AppError{}
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if !isSlice(r.Val) || len(r.Val.([]interface{})) != 0 {
t.Errorf("Return Value should be default, gets: \"%v\"\n", r.Val)
}
if r.Err == nil {
t.Errorf("Should returns an Error, gets `nil`\n")
}
}
func TestTake_ShouldCancelWhenRootCanceled(t *testing.T) {
t.Parallel()
rootCtx, cancel := context.WithCancel(context.Background())
ch := make(chan MultiReturns)
go func() {
r, err := Take(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
select {
case <-ctx.Done():
return nil, AppError{}
case <-time.After(300 * time.Millisecond):
return 3, nil
}
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
go func() {
time.Sleep(150 * time.Millisecond)
cancel()
}()
r := <-ch
if !isSlice(r.Val) || len(r.Val.([]interface{})) != 0 {
t.Errorf("Return Value should be default, gets: \"%v\"\n", r.Val)
}
if r.Err == nil {
t.Errorf("Should returns an Error, gets `nil`\n")
}
}
func TestAll_ShouldWorksAsExpected(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := All(
rootCtx,
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
<-time.After(300 * time.Millisecond)
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
rs := []int{}
for _, v := range r.Val.([]interface{}) {
rs = append(rs, v.(int))
}
equal := reflect.DeepEqual([]int{1, 2, 3}, rs)
if !equal {
t.Errorf("Execution order is wrong, gets: %+v\n", rs)
}
}
func TestAll_WhenOutOfOrder(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := All(
rootCtx,
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(300 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
<-time.After(100 * time.Millisecond)
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
rs := []int{}
for _, v := range r.Val.([]interface{}) {
rs = append(rs, v.(int))
}
equal := reflect.DeepEqual([]int{1, 2, 3}, rs)
if !equal {
t.Errorf("Execution order is wrong, gets: %+v\n", rs)
}
}
func TestAll_WhenRootCtxCanceled(t *testing.T) {
t.Parallel()
rootCtx, cancel := context.WithCancel(context.Background())
ch := make(chan MultiReturns)
go func() {
r, err := All(
rootCtx,
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
select {
case <-ctx.Done():
return nil, AppError{}
case <-time.After(300 * time.Millisecond):
return 3, nil
}
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
go func() {
time.Sleep(150 * time.Millisecond)
cancel()
}()
r := <-ch
if !isSlice(r.Val) || len(r.Val.([]interface{})) != 0 {
t.Errorf("Return Value should be default, gets: \"%v\"\n", r.Val)
}
if r.Err == nil {
t.Errorf("Should returns an Error, gets `nil`\n")
}
}
func TestAll_WhenAnySubFunctionFailed(t *testing.T) {
t.Parallel()
rootCtx, cancel := context.WithCancel(context.Background())
defer cancel()
ch := make(chan MultiReturns)
go func() {
r, err := All(
rootCtx,
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(300 * time.Millisecond)
return nil, AppError{}
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if !isSlice(r.Val) || len(r.Val.([]interface{})) != 0 {
t.Errorf("Return Value should be default, gets: \"%v\"\n", r.Val)
}
if r.Err == nil {
t.Errorf("Should returns an Error, gets `nil`\n")
}
if r.Err.Error() != "app error!" {
t.Errorf("Should returns an AppError, gets \"%v\"\n", r.Err.Error())
}
}
func TestRetry_WithNoFailure(t *testing.T) {
t.Parallel()
times := 0
expect := 1
rootCtx, cancel := context.WithCancel(context.Background())
defer cancel()
ch := make(chan MultiReturns)
go func() {
r, err := Retry(
rootCtx,
10,
func(ctx context.Context) (interface{}, error) {
times++
time.Sleep(100 * time.Millisecond)
return expect, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
val, ok := r.Val.(int)
if ok == false || val != expect {
t.Errorf("Unmatched value: %v\n", r.Val)
}
if times != 1 {
t.Errorf("Should execute only once, gets: %v\n", times)
}
}
func TestLast_ShouldWorksAsExpected(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Last(
rootCtx,
2,
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 1, nil
},
func(ctx context.Context) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 2, nil
},
func(ctx context.Context) (interface{}, error) {
<-time.After(300 * time.Millisecond)
return 3, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
rs := []int{}
for _, v := range r.Val.([]interface{}) {
rs = append(rs, v.(int))
}
equal := reflect.DeepEqual([]int{1, 3}, rs)
if !equal {
t.Errorf("Execution order is wrong, gets: %+v\n", rs)
}
}
func TestWaterfall_ShouldWorksAsExpected(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Waterfall(
rootCtx,
func(ctx context.Context, n interface{}) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
return 1, nil
},
func(ctx context.Context, n interface{}) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
n = n.(int) + 1
return n, nil
},
func(ctx context.Context, n interface{}) (interface{}, error) {
time.Sleep(100 * time.Millisecond)
n = n.(int) + 1
return n, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
if r.Val.(int) != 3 {
t.Errorf("Expect \"3\", but gets: \"%v\"\n", r.Val)
}
}
func TestRetry_ShouldReturnsOnSuccess(t *testing.T) {
t.Parallel()
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Retry(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
time.Sleep(200 * time.Millisecond)
return 1, nil
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
if r.Val != 1 {
t.Errorf("Should gets `1`, gets: %+v instead\n", r.Val)
}
}
func TestRetry_ShouldReturnsAfterFailingSeveralTimes(t *testing.T) {
t.Parallel()
var times int32
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Retry(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
atomic.AddInt32(×, 1)
if atomic.LoadInt32(×) >= 2 {
return 1, nil
}
return nil, fmt.Errorf("err")
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err != nil {
t.Errorf("Gets an error: %v\n", r.Err)
}
if times != 2 {
t.Errorf("Should tried 2 times, instead of %v\n", times)
}
if r.Val != 1 {
t.Errorf("Should gets `1`, gets: %+v instead\n", r.Val)
}
}
func TestRetry_ShouldKeepRetrying(t *testing.T) {
t.Parallel()
var times int32
rootCtx := context.Background()
ch := make(chan MultiReturns)
go func() {
r, err := Retry(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
atomic.AddInt32(×, 1)
return nil, fmt.Errorf("err")
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
r := <-ch
if r.Err == nil {
t.Errorf("Should gets an error")
}
if times != 3 {
t.Errorf("Should tried 3 times, instead of: %+v\n", times)
}
}
func TestRetry_WhenRootCtxCanceled(t *testing.T) {
t.Parallel()
rootCtx, cancel := context.WithCancel(context.Background())
ch := make(chan MultiReturns)
go func() {
r, err := Retry(
rootCtx,
3,
func(ctx context.Context) (interface{}, error) {
time.Sleep(50 * time.Millisecond)
return nil, fmt.Errorf("err")
},
)
ch <- MultiReturns{r, err}
close(ch)
}()
go func() {
time.Sleep(10 * time.Millisecond)
cancel()
}()
r := <-ch
if r.Err == nil {
t.Errorf("Should gets an error")
}
}
func TestMin(t *testing.T) {
t.Parallel()
if min(1, 2) != 1 {
t.Errorf("Should returns 1")
}
if min(-1, 2) != -1 {
t.Errorf("Should returns -1")
}
if min(54321, 12345) != 12345 {
t.Errorf("Should returns 12345")
}
}