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610 lines
13 KiB
Go
610 lines
13 KiB
Go
package mr
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import (
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"context"
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"errors"
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"io"
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"log"
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"runtime"
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"sync/atomic"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"go.uber.org/goleak"
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)
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var errDummy = errors.New("dummy")
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func init() {
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log.SetOutput(io.Discard)
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}
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func TestFinish(t *testing.T) {
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defer goleak.VerifyNone(t)
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var total uint32
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err := Finish(func() error {
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atomic.AddUint32(&total, 2)
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return nil
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}, func() error {
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atomic.AddUint32(&total, 3)
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return nil
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}, func() error {
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atomic.AddUint32(&total, 5)
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return nil
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})
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assert.Equal(t, uint32(10), atomic.LoadUint32(&total))
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assert.Nil(t, err)
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}
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func TestFinishNone(t *testing.T) {
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defer goleak.VerifyNone(t)
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assert.Nil(t, Finish())
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}
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func TestFinishVoidNone(t *testing.T) {
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defer goleak.VerifyNone(t)
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FinishVoid()
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}
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func TestFinishErr(t *testing.T) {
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defer goleak.VerifyNone(t)
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var total uint32
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err := Finish(func() error {
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atomic.AddUint32(&total, 2)
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return nil
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}, func() error {
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atomic.AddUint32(&total, 3)
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return errDummy
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}, func() error {
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atomic.AddUint32(&total, 5)
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return nil
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})
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assert.Equal(t, errDummy, err)
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}
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func TestFinishVoid(t *testing.T) {
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defer goleak.VerifyNone(t)
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var total uint32
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FinishVoid(func() {
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atomic.AddUint32(&total, 2)
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}, func() {
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atomic.AddUint32(&total, 3)
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}, func() {
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atomic.AddUint32(&total, 5)
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})
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assert.Equal(t, uint32(10), atomic.LoadUint32(&total))
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}
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func TestForEach(t *testing.T) {
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const tasks = 1000
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t.Run("all", func(t *testing.T) {
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defer goleak.VerifyNone(t)
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var count uint32
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ForEach(func(source chan<- int) {
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for i := 0; i < tasks; i++ {
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source <- i
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}
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}, func(item int) {
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atomic.AddUint32(&count, 1)
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}, WithWorkers(-1))
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assert.Equal(t, tasks, int(count))
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})
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t.Run("odd", func(t *testing.T) {
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defer goleak.VerifyNone(t)
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var count uint32
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ForEach(func(source chan<- int) {
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for i := 0; i < tasks; i++ {
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source <- i
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}
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}, func(item int) {
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if item%2 == 0 {
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atomic.AddUint32(&count, 1)
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}
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})
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assert.Equal(t, tasks/2, int(count))
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})
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t.Run("all", func(t *testing.T) {
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defer goleak.VerifyNone(t)
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assert.PanicsWithValue(t, "foo", func() {
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ForEach(func(source chan<- int) {
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for i := 0; i < tasks; i++ {
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source <- i
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}
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}, func(item int) {
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panic("foo")
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})
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})
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})
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}
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func TestGeneratePanic(t *testing.T) {
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defer goleak.VerifyNone(t)
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t.Run("all", func(t *testing.T) {
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assert.PanicsWithValue(t, "foo", func() {
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ForEach(func(source chan<- int) {
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panic("foo")
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}, func(item int) {
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})
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})
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})
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}
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func TestMapperPanic(t *testing.T) {
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defer goleak.VerifyNone(t)
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const tasks = 1000
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var run int32
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t.Run("all", func(t *testing.T) {
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assert.PanicsWithValue(t, "foo", func() {
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_, _ = MapReduce(func(source chan<- int) {
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for i := 0; i < tasks; i++ {
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source <- i
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}
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}, func(item int, writer Writer[int], cancel func(error)) {
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atomic.AddInt32(&run, 1)
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panic("foo")
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}, func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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})
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})
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assert.True(t, atomic.LoadInt32(&run) < tasks/2)
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})
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}
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func TestMapReduce(t *testing.T) {
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defer goleak.VerifyNone(t)
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tests := []struct {
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name string
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mapper MapperFunc[int, int]
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reducer ReducerFunc[int, int]
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expectErr error
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expectValue int
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}{
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{
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name: "simple",
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expectErr: nil,
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expectValue: 30,
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},
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{
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name: "cancel with error",
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mapper: func(v int, writer Writer[int], cancel func(error)) {
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if v%3 == 0 {
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cancel(errDummy)
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}
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writer.Write(v * v)
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},
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expectErr: errDummy,
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},
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{
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name: "cancel with nil",
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mapper: func(v int, writer Writer[int], cancel func(error)) {
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if v%3 == 0 {
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cancel(nil)
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}
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writer.Write(v * v)
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},
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expectErr: ErrCancelWithNil,
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},
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{
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name: "cancel with more",
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reducer: func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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var result int
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for item := range pipe {
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result += item
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if result > 10 {
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cancel(errDummy)
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}
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}
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writer.Write(result)
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},
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expectErr: errDummy,
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},
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}
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t.Run("MapReduce", func(t *testing.T) {
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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if test.mapper == nil {
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test.mapper = func(v int, writer Writer[int], cancel func(error)) {
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writer.Write(v * v)
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}
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}
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if test.reducer == nil {
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test.reducer = func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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var result int
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for item := range pipe {
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result += item
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}
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writer.Write(result)
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}
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}
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value, err := MapReduce(func(source chan<- int) {
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for i := 1; i < 5; i++ {
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source <- i
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}
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}, test.mapper, test.reducer, WithWorkers(runtime.NumCPU()))
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assert.Equal(t, test.expectErr, err)
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assert.Equal(t, test.expectValue, value)
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})
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}
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})
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t.Run("MapReduce", func(t *testing.T) {
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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if test.mapper == nil {
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test.mapper = func(v int, writer Writer[int], cancel func(error)) {
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writer.Write(v * v)
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}
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}
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if test.reducer == nil {
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test.reducer = func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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var result int
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for item := range pipe {
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result += item
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}
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writer.Write(result)
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}
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}
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source := make(chan int)
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go func() {
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for i := 1; i < 5; i++ {
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source <- i
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}
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close(source)
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}()
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value, err := MapReduceChan(source, test.mapper, test.reducer, WithWorkers(-1))
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assert.Equal(t, test.expectErr, err)
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assert.Equal(t, test.expectValue, value)
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})
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}
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})
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}
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func TestMapReduceWithReduerWriteMoreThanOnce(t *testing.T) {
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defer goleak.VerifyNone(t)
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assert.Panics(t, func() {
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MapReduce(func(source chan<- int) {
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for i := 0; i < 10; i++ {
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source <- i
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}
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}, func(item int, writer Writer[int], cancel func(error)) {
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writer.Write(item)
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}, func(pipe <-chan int, writer Writer[string], cancel func(error)) {
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drain(pipe)
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writer.Write("one")
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writer.Write("two")
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})
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})
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}
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func TestMapReduceVoid(t *testing.T) {
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defer goleak.VerifyNone(t)
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var value uint32
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tests := []struct {
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name string
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mapper MapperFunc[int, int]
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reducer VoidReducerFunc[int]
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expectValue uint32
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expectErr error
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}{
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{
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name: "simple",
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expectValue: 30,
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expectErr: nil,
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},
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{
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name: "cancel with error",
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mapper: func(v int, writer Writer[int], cancel func(error)) {
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if v%3 == 0 {
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cancel(errDummy)
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}
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writer.Write(v * v)
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},
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expectErr: errDummy,
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},
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{
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name: "cancel with nil",
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mapper: func(v int, writer Writer[int], cancel func(error)) {
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if v%3 == 0 {
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cancel(nil)
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}
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writer.Write(v * v)
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},
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expectErr: ErrCancelWithNil,
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},
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{
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name: "cancel with more",
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reducer: func(pipe <-chan int, cancel func(error)) {
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for item := range pipe {
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result := atomic.AddUint32(&value, uint32(item))
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if result > 10 {
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cancel(errDummy)
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}
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}
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},
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expectErr: errDummy,
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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atomic.StoreUint32(&value, 0)
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if test.mapper == nil {
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test.mapper = func(v int, writer Writer[int], cancel func(error)) {
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writer.Write(v * v)
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}
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}
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if test.reducer == nil {
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test.reducer = func(pipe <-chan int, cancel func(error)) {
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for item := range pipe {
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atomic.AddUint32(&value, uint32(item))
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}
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}
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}
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err := MapReduceVoid(func(source chan<- int) {
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for i := 1; i < 5; i++ {
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source <- i
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}
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}, test.mapper, test.reducer)
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assert.Equal(t, test.expectErr, err)
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if err == nil {
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assert.Equal(t, test.expectValue, atomic.LoadUint32(&value))
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}
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})
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}
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}
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func TestMapReduceVoidWithDelay(t *testing.T) {
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defer goleak.VerifyNone(t)
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var result []int
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err := MapReduceVoid(func(source chan<- int) {
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source <- 0
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source <- 1
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}, func(i int, writer Writer[int], cancel func(error)) {
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if i == 0 {
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time.Sleep(time.Millisecond * 50)
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}
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writer.Write(i)
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}, func(pipe <-chan int, cancel func(error)) {
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for item := range pipe {
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i := item
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result = append(result, i)
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}
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})
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assert.Nil(t, err)
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assert.Equal(t, 2, len(result))
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assert.Equal(t, 1, result[0])
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assert.Equal(t, 0, result[1])
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}
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func TestMapReducePanic(t *testing.T) {
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defer goleak.VerifyNone(t)
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assert.Panics(t, func() {
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_, _ = MapReduce(func(source chan<- int) {
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source <- 0
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source <- 1
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}, func(i int, writer Writer[int], cancel func(error)) {
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writer.Write(i)
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}, func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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for range pipe {
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panic("panic")
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}
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})
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})
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}
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func TestMapReducePanicOnce(t *testing.T) {
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defer goleak.VerifyNone(t)
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assert.Panics(t, func() {
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_, _ = MapReduce(func(source chan<- int) {
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for i := 0; i < 100; i++ {
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source <- i
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}
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}, func(i int, writer Writer[int], cancel func(error)) {
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if i == 0 {
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panic("foo")
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}
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writer.Write(i)
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}, func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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for range pipe {
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panic("bar")
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}
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})
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})
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}
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func TestMapReducePanicBothMapperAndReducer(t *testing.T) {
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defer goleak.VerifyNone(t)
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assert.Panics(t, func() {
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_, _ = MapReduce(func(source chan<- int) {
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source <- 0
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source <- 1
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}, func(item int, writer Writer[int], cancel func(error)) {
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panic("foo")
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}, func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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panic("bar")
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})
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})
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}
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func TestMapReduceVoidCancel(t *testing.T) {
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defer goleak.VerifyNone(t)
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var result []int
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err := MapReduceVoid(func(source chan<- int) {
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source <- 0
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source <- 1
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}, func(i int, writer Writer[int], cancel func(error)) {
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if i == 1 {
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cancel(errors.New("anything"))
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}
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writer.Write(i)
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}, func(pipe <-chan int, cancel func(error)) {
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for item := range pipe {
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i := item
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result = append(result, i)
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}
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})
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assert.NotNil(t, err)
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assert.Equal(t, "anything", err.Error())
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}
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func TestMapReduceVoidCancelWithRemains(t *testing.T) {
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defer goleak.VerifyNone(t)
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var done int32
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var result []int
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err := MapReduceVoid(func(source chan<- int) {
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for i := 0; i < defaultWorkers*2; i++ {
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source <- i
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}
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atomic.AddInt32(&done, 1)
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}, func(i int, writer Writer[int], cancel func(error)) {
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if i == defaultWorkers/2 {
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cancel(errors.New("anything"))
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}
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writer.Write(i)
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}, func(pipe <-chan int, cancel func(error)) {
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for item := range pipe {
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result = append(result, item)
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}
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})
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assert.NotNil(t, err)
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assert.Equal(t, "anything", err.Error())
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assert.Equal(t, int32(1), done)
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}
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func TestMapReduceWithoutReducerWrite(t *testing.T) {
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defer goleak.VerifyNone(t)
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uids := []int{1, 2, 3}
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res, err := MapReduce(func(source chan<- int) {
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for _, uid := range uids {
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source <- uid
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}
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}, func(item int, writer Writer[int], cancel func(error)) {
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writer.Write(item)
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}, func(pipe <-chan int, writer Writer[int], cancel func(error)) {
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drain(pipe)
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// not calling writer.Write(...), should not panic
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})
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assert.Equal(t, ErrReduceNoOutput, err)
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assert.Equal(t, 0, res)
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}
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func TestMapReduceVoidPanicInReducer(t *testing.T) {
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defer goleak.VerifyNone(t)
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const message = "foo"
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assert.Panics(t, func() {
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var done int32
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_ = MapReduceVoid(func(source chan<- int) {
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for i := 0; i < defaultWorkers*2; i++ {
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source <- i
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}
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atomic.AddInt32(&done, 1)
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}, func(i int, writer Writer[int], cancel func(error)) {
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writer.Write(i)
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}, func(pipe <-chan int, cancel func(error)) {
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panic(message)
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}, WithWorkers(1))
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})
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}
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func TestForEachWithContext(t *testing.T) {
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defer goleak.VerifyNone(t)
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var done int32
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ctx, cancel := context.WithCancel(context.Background())
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ForEach(func(source chan<- int) {
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for i := 0; i < defaultWorkers*2; i++ {
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source <- i
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}
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atomic.AddInt32(&done, 1)
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}, func(i int) {
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if i == defaultWorkers/2 {
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cancel()
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}
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}, WithContext(ctx))
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}
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|
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func TestMapReduceWithContext(t *testing.T) {
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defer goleak.VerifyNone(t)
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|
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var done int32
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var result []int
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ctx, cancel := context.WithCancel(context.Background())
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err := MapReduceVoid(func(source chan<- int) {
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for i := 0; i < defaultWorkers*2; i++ {
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source <- i
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}
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atomic.AddInt32(&done, 1)
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}, func(i int, writer Writer[int], c func(error)) {
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if i == defaultWorkers/2 {
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|
cancel()
|
|
}
|
|
writer.Write(i)
|
|
time.Sleep(time.Millisecond)
|
|
}, func(pipe <-chan int, cancel func(error)) {
|
|
for item := range pipe {
|
|
i := item
|
|
result = append(result, i)
|
|
}
|
|
}, WithContext(ctx))
|
|
assert.NotNil(t, err)
|
|
assert.Equal(t, context.DeadlineExceeded, err)
|
|
}
|
|
|
|
func BenchmarkMapReduce(b *testing.B) {
|
|
b.ReportAllocs()
|
|
|
|
mapper := func(v int64, writer Writer[int64], cancel func(error)) {
|
|
writer.Write(v * v)
|
|
}
|
|
reducer := func(input <-chan int64, writer Writer[int64], cancel func(error)) {
|
|
var result int64
|
|
for v := range input {
|
|
result += v
|
|
}
|
|
writer.Write(result)
|
|
}
|
|
|
|
for i := 0; i < b.N; i++ {
|
|
MapReduce(func(input chan<- int64) {
|
|
for j := 0; j < 2; j++ {
|
|
input <- int64(j)
|
|
}
|
|
}, mapper, reducer)
|
|
}
|
|
}
|