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stream_shadow_test.go
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/
stream_shadow_test.go
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package ps121
import (
"errors"
"io"
"sync"
"testing"
"time"
"github.com/brianvoe/gofakeit/v6"
pbany "github.com/golang/protobuf/ptypes/any"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
gomock "go.uber.org/mock/gomock"
)
var _ Stream = &StreamWithShadow{}
func TestStreamWithShadow_Send(t *testing.T) {
t.Run("Happy Path", func(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
fakeMessage := new(pbany.Any)
gofakeit.Struct(fakeMessage)
require.NotNil(t, fakeMessage)
require.NotEmpty(t, fakeMessage)
mockStream := NewMockStream(ctrl)
mockShadow := NewMockStream(ctrl)
mockComparator := NewMockComparator(ctrl)
var wg sync.WaitGroup
mockStream.EXPECT().Send(fakeMessage).Return(nil)
wg.Add(1)
mockShadow.EXPECT().Send(fakeMessage).Do(func(_ any) {
time.Sleep(50 * time.Millisecond)
wg.Done()
}).Return(nil)
sut := StreamWithShadow{
Primary: mockStream,
Shadow: mockShadow,
Comparator: mockComparator,
}
startTime := time.Now()
err := sut.Send(fakeMessage)
elapsed1 := time.Now().Sub(startTime)
wg.Wait()
elapsed2 := time.Now().Sub(startTime)
require.NoError(t, err)
assert.InDelta(t, 0, elapsed1.Milliseconds(), 5)
assert.InDelta(t, 50, elapsed2.Milliseconds(), 5)
// Wait for remaining calls in other goroutines
time.Sleep(100 * time.Millisecond)
})
t.Run("When primary fails, dont call shadow", func(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
fakeError := errors.New(gofakeit.SentenceSimple())
fakeMessage := new(pbany.Any)
gofakeit.Struct(fakeMessage)
require.NotNil(t, fakeMessage)
require.NotEmpty(t, fakeMessage)
mockStream := NewMockStream(ctrl)
mockShadow := NewMockStream(ctrl)
mockComparator := NewMockComparator(ctrl)
mockStream.EXPECT().Send(fakeMessage).Return(fakeError)
sut := StreamWithShadow{
Primary: mockStream,
Shadow: mockShadow,
Comparator: mockComparator,
}
err := sut.Send(fakeMessage)
require.ErrorIs(t, err, fakeError)
// Wait for remaining calls in other goroutines
time.Sleep(100 * time.Millisecond)
})
t.Run("When shadow fails must log", func(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
fakeError := errors.New(gofakeit.SentenceSimple())
fakeMessage := new(pbany.Any)
gofakeit.Struct(fakeMessage)
require.NotNil(t, fakeMessage)
require.NotEmpty(t, fakeMessage)
mockStream := NewMockStream(ctrl)
mockShadow := NewMockStream(ctrl)
mockComparator := NewMockComparator(ctrl)
var wg sync.WaitGroup
mockStream.EXPECT().Send(fakeMessage).Return(nil)
wg.Add(1)
mockShadow.EXPECT().Send(fakeMessage).Do(func(_ any) {
time.Sleep(50 * time.Millisecond)
wg.Done()
}).Return(fakeError)
// mockLogger.EXPECT().LogSendFailure(fakeError)
sut := StreamWithShadow{
Primary: mockStream,
Shadow: mockShadow,
Comparator: mockComparator,
}
startTime := time.Now()
err := sut.Send(fakeMessage)
elapsed1 := time.Now().Sub(startTime)
wg.Wait()
elapsed2 := time.Now().Sub(startTime)
require.NoError(t, err)
assert.InDelta(t, 0, elapsed1.Milliseconds(), 5)
assert.InDelta(t, 50, elapsed2.Milliseconds(), 5)
// Wait for remaining calls in other goroutines
time.Sleep(100 * time.Millisecond)
})
}
func TestStreamWithShadow_Receive_Realistic(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
fakeMethod := gofakeit.BuzzWord()
fakeMessageBytes := []byte(gofakeit.SentenceSimple())
fakeMessage := NewFakeProtoMessage(fakeMessageBytes)
require.NotNil(t, fakeMessage)
require.NotEmpty(t, fakeMessage)
fakeError := errors.New(gofakeit.SentenceSimple())
fakeShadowMessageBytes := []byte(gofakeit.SentenceSimple())
fakeShadowMessage := NewFakeProtoMessage(fakeShadowMessageBytes)
require.NotNil(t, fakeShadowMessage)
require.NotEmpty(t, fakeShadowMessage)
fakeShadowError := errors.New(gofakeit.SentenceSimple())
require.NotEqual(t, fakeMessage, fakeShadowMessage)
require.NotEqual(t, &fakeMessage, &fakeShadowMessage)
mockStream := NewMockStream(ctrl)
mockShadow := NewMockStream(ctrl)
mockComparator := NewMockComparator(ctrl)
mockStream.EXPECT().
Receive().
Do(func() {
time.Sleep(200 * time.Millisecond)
}).
Return(fakeMessage, fakeError)
mockStream.EXPECT().Receive().Return(nil, io.EOF)
var waitShadow sync.WaitGroup
waitShadow.Add(2)
mockShadow.EXPECT().
Receive().
Do(func() {
time.Sleep(50 * time.Millisecond)
waitShadow.Done()
}).
Return(fakeShadowMessage, fakeShadowError)
mockShadow.EXPECT().
Receive().
Do(func() {
waitShadow.Done()
}).
Return(nil, io.EOF)
var waitComparator sync.WaitGroup
waitComparator.Add(2)
mockComparator.EXPECT().
Compare(fakeMethod, fakeMessageBytes, fakeError, fakeShadowMessageBytes, fakeShadowError).
Do(func(_, _, _, _, _ any) {
waitComparator.Done()
})
mockComparator.EXPECT().
Compare(fakeMethod, nil, io.EOF, nil, io.EOF).
Do(func(_, _, _, _, _ any) {
waitComparator.Done()
})
sut := StreamWithShadow{
Method: fakeMethod,
Primary: mockStream,
Shadow: mockShadow,
Comparator: mockComparator,
}
startTime := time.Now()
receiveMsg1, receiveErr1 := sut.Receive()
receiveMsg2, receiveErr2 := sut.Receive()
receivePrimaryDuration := time.Now().Sub(startTime)
waitShadow.Wait()
receiveShadow1Duration := time.Now().Sub(startTime)
assert.Equal(t, fakeMessage, receiveMsg1)
assert.Equal(t, fakeError, receiveErr1)
assert.Nil(t, receiveMsg2)
assert.Equal(t, io.EOF, receiveErr2)
assert.InDelta(t, 200, receivePrimaryDuration.Milliseconds(), 5)
assert.InDelta(t, 200+50, receiveShadow1Duration.Milliseconds(), 5)
waitComparator.Wait()
}