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future_test.go
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future_test.go
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package mo
import (
"fmt"
"sync/atomic"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func assertAndIncrement(is *assert.Assertions, expected int, i *int32) {
got := atomic.LoadInt32(i)
is.Equal(int32(expected), got)
atomic.AddInt32(i, 1)
}
func TestFuture(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
resolve(42)
}).Then(func(value int) (int, error) {
is.Equal(42, value)
return 21, assert.AnError
}).Catch(func(err error) (int, error) {
is.Equal(assert.AnError, err)
return 0, nil
}).Then(func(value int) (int, error) {
is.Equal(0, value)
return 84, nil
}).Collect()
is.Equal(84, result)
is.Nil(err)
}
func TestFutureSimpleResolve(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
resolve(42)
}).Collect()
is.Equal(42, result)
is.Nil(err)
}
func TestFutureSimpleReject(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
reject(assert.AnError)
}).Collect()
is.Equal(0, result)
is.NotNil(err)
is.Equal(assert.AnError, err)
}
func TestFutureMultipleResolve(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
resolve(42)
}).Then(func(value int) (int, error) {
is.Equal(42, value)
return 84, nil
}).Then(func(value int) (int, error) {
is.Equal(84, value)
return 21, nil
}).Collect()
is.Equal(21, result)
is.Nil(err)
}
func TestFutureMultipleReject(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
resolve(42)
}).Catch(func(err error) (int, error) {
is.Fail("should not enter here")
return 84, assert.AnError
}).Then(func(value int) (int, error) {
is.Equal(42, value)
return 21, assert.AnError
}).Catch(func(err error) (int, error) {
is.Equal(assert.AnError, err)
return 1, nil
}).Collect()
is.Equal(1, result)
is.Nil(err)
}
func TestFutureSingleReject(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
reject(assert.AnError)
}).Catch(func(err error) (int, error) {
is.Equal(assert.AnError, err)
return 84, nil
}).Collect()
is.Equal(84, result)
is.Nil(err)
}
func TestFutureErrorResult(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
reject(assert.AnError)
}).Collect()
is.Equal(0, result)
is.NotNil(err)
is.Equal(assert.AnError, err)
}
func TestFutureFinallyResolve(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
resolve(21)
}).Finally(func(value int, err error) (int, error) {
is.Equal(21, value)
is.Nil(err)
return 42, nil
}).Collect()
is.Equal(42, result)
is.Nil(err)
}
func TestFutureFinallyReject(t *testing.T) {
is := assert.New(t)
result, err := NewFuture[int](func(resolve func(int), reject func(error)) {
reject(assert.AnError)
}).Finally(func(value int, err error) (int, error) {
is.Equal(0, value)
is.NotNil(err)
is.Equal(assert.AnError, err)
return 42, nil
}).Collect()
is.Equal(42, result)
is.Nil(err)
}
func TestFutureOrder(t *testing.T) {
is := assert.New(t)
var i int32 = 0
_ = NewFuture[int](func(resolve func(int), reject func(error)) {
assertAndIncrement(is, 1, &i)
resolve(42)
}).Then(func(value int) (int, error) {
assertAndIncrement(is, 2, &i)
return 21, assert.AnError
}).Catch(func(err error) (int, error) {
assertAndIncrement(is, 3, &i)
return 1, nil
}).Finally(func(value int, err error) (int, error) {
assertAndIncrement(is, 4, &i)
return 21, nil
})
assertAndIncrement(is, 0, &i)
}
func TestFutureOrderCollect(t *testing.T) {
is := assert.New(t)
var i int32 = 0
_, _ = NewFuture[int](func(resolve func(int), reject func(error)) {
assertAndIncrement(is, 0, &i)
resolve(42)
}).Then(func(value int) (int, error) {
assertAndIncrement(is, 1, &i)
return 21, assert.AnError
}).Catch(func(err error) (int, error) {
assertAndIncrement(is, 2, &i)
return 1, nil
}).Finally(func(value int, err error) (int, error) {
assertAndIncrement(is, 3, &i)
return 1, nil
}).Collect()
assertAndIncrement(is, 4, &i)
}
func TestFutureCancel(t *testing.T) {
is := assert.New(t)
var i int32 = 0
future := NewFuture[int](func(resolve func(int), reject func(error)) {
assertAndIncrement(is, 0, &i)
time.Sleep(5 * time.Millisecond)
resolve(42)
}).Then(func(value int) (int, error) {
assertAndIncrement(is, 3, &i)
is.Fail("should not enter here")
return 21, assert.AnError
})
time.Sleep(1 * time.Millisecond)
assertAndIncrement(is, 1, &i)
future.Cancel()
time.Sleep(10 * time.Millisecond)
assertAndIncrement(is, 2, &i)
}
func TestFutureCancelDelayed(t *testing.T) {
is := assert.New(t)
var i int32 = 0
future := NewFuture[int](func(resolve func(int), reject func(error)) {
time.Sleep(1 * time.Millisecond)
assertAndIncrement(is, 1, &i)
resolve(42)
}).Then(func(value int) (int, error) {
assertAndIncrement(is, 2, &i)
return 21, assert.AnError
})
assertAndIncrement(is, 0, &i)
time.Sleep(10 * time.Millisecond)
future.Cancel()
assertAndIncrement(is, 3, &i)
}
func TestFutureCancelTerminated(t *testing.T) {
is := assert.New(t)
var i int32 = 0
future := NewFuture[int](func(resolve func(int), reject func(error)) {
time.Sleep(1 * time.Millisecond)
assertAndIncrement(is, 1, &i)
resolve(42)
}).Then(func(value int) (int, error) {
assertAndIncrement(is, 2, &i)
return 21, assert.AnError
})
assertAndIncrement(is, 0, &i)
_, _ = future.Collect()
assertAndIncrement(is, 3, &i)
future.Cancel()
assertAndIncrement(is, 4, &i)
}
func TestFutureResultResult(t *testing.T) {
is := assert.New(t)
result := NewFuture[int](func(resolve func(int), reject func(error)) {
reject(assert.AnError)
}).Result()
is.Equal(Err[int](assert.AnError), result)
is.NotNil(result.Error())
is.Equal(assert.AnError, result.Error())
}
func TestFutureResultEither(t *testing.T) {
is := assert.New(t)
either := NewFuture[int](func(resolve func(int), reject func(error)) {
reject(assert.AnError)
}).Either()
is.Equal(Left[error, int](assert.AnError), either)
is.NotNil(either.Left())
is.Equal(assert.AnError, either.MustLeft())
}
func TestFutureCompleteBeforeThen(t *testing.T) {
completed := make(chan struct{})
fut := NewFuture(func(resolve func(int), reject func(error)) {
resolve(1)
close(completed)
})
<-completed
//nolint:errcheck
fut.Then(func(in int) (int, error) {
fmt.Println(in) // will never been print
return in, nil
}).Collect() // deadlock
}