async/async_test.go at master · eleniums/async · GitHub

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package async

import (
	"context"
	"errors"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	assert "github.com/stretchr/testify/require"
)

func Test_Run_Success(t *testing.T) {
	// arrange
	task1Completed := false
	task1 := func() error {
		defer func() { task1Completed = true }()
		return nil
	}

	task2Completed := false
	task2 := func() error {
		defer func() { task2Completed = true }()
		return nil
	}

	task3Completed := false
	task3 := func() error {
		defer func() { task3Completed = true }()
		return nil
	}

	// act
	errc := Run(task1, task2, task3)
	err := Wait(errc)

	// assert
	assert.NoError(t, err)
	assert.True(t, task1Completed)
	assert.True(t, task2Completed)
	assert.True(t, task3Completed)
}

func Test_Run_Error(t *testing.T) {
	// arrange
	task1Completed := false
	task1 := func() error {
		defer func() { task1Completed = true }()
		return nil
	}

	task2Completed := false
	task2 := func() error {
		defer func() { task2Completed = true }()
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	task3Completed := false
	task3 := func() error {
		defer func() { task3Completed = true }()
		time.Sleep(time.Millisecond * 100)
		return errors.New("task3 error")
	}

	// act
	errc := Run(task1, task2, task3)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
	assert.True(t, task1Completed)
	assert.False(t, task2Completed)
	assert.True(t, task3Completed)
}

func Test_RunLimited_Success(t *testing.T) {
	// arrange
	ctx := context.Background()

	var count int32
	task := func() error {
		atomic.AddInt32(&count, 1)
		return nil
	}

	// act
	errc := RunLimited(ctx, 3, 4, task)
	err := Wait(errc)

	// assert
	assert.NoError(t, err)
	assert.Equal(t, int32(12), count)
}

func Test_RunLimited_Cancel(t *testing.T) {
	// arrange
	ctx, cancel := context.WithCancel(context.Background())

	var count int32
	task := func() error {
		atomic.AddInt32(&count, 1)

		if count >= 6 {
			cancel()
		}

		return nil
	}

	// act
	errc := RunLimited(ctx, 3, 4, task)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
	assert.True(t, count >= 6)
	assert.True(t, count < 12)
}

func Test_RunLimited_Error(t *testing.T) {
	// arrange
	ctx := context.Background()

	var count int32
	task := func() error {
		atomic.AddInt32(&count, 1)

		if count >= 6 {
			return errors.New("task error")
		}

		return nil
	}

	// act
	errc := RunLimited(ctx, 3, 4, task)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
	assert.True(t, count >= 6)
	assert.True(t, count < 12)
}

func Test_RunForever_Cancel(t *testing.T) {
	// arrange
	ctx, cancel := context.WithCancel(context.Background())

	var count int32
	task := func() error {
		atomic.AddInt32(&count, 1)

		if count >= 10 {
			cancel()
		}

		return nil
	}

	// act
	errc := RunForever(ctx, 2, task)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
	assert.True(t, count >= 10)
}

func Test_RunForever_Timeout(t *testing.T) {
	// arrange
	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*100)
	defer cancel()

	task := func() error {
		return nil
	}

	// act
	errc := RunForever(ctx, 2, task)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
}

func Test_RunForever_Deadline(t *testing.T) {
	// arrange
	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Millisecond*100))
	defer cancel()

	task := func() error {
		return nil
	}

	// act
	errc := RunForever(ctx, 2, task)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
}

func Test_RunForever_Error(t *testing.T) {
	// arrange
	ctx := context.Background()

	var count int32
	task := func() error {
		atomic.AddInt32(&count, 1)

		if count >= 10 {
			return errors.New("task error")
		}

		return nil
	}

	// act
	errc := RunForever(ctx, 2, task)
	err := Wait(errc)

	// assert
	assert.Error(t, err)
	assert.True(t, count >= 10)
}

func Test_HandleError_Success(t *testing.T) {
	// arrange
	var wg sync.WaitGroup
	wg.Add(3)

	task1 := func() error {
		return errors.New("task1 error")
	}

	task2 := func() error {
		time.Sleep(time.Millisecond * 200)
		return errors.New("task2 error")
	}

	task3 := func() error {
		time.Sleep(time.Millisecond * 100)
		return errors.New("task3 error")
	}

	// act
	errc := Run(task1, task2, task3)

	count := 0
	HandleError(errc, func(err error) {
		defer wg.Done()
		count++
	})
	wg.Wait()

	// assert
	assert.Equal(t, 3, count)
}

func Benchmark_Run(b *testing.B) {
	task := func() error {
		return nil
	}

	for i := 0; i < b.N; i++ {
		Run(task, task, task)
	}
}