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tea_test.go
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tea_test.go
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package tea
import (
"bytes"
"context"
"errors"
"sync/atomic"
"testing"
"time"
)
type incrementMsg struct{}
type testModel struct {
executed atomic.Value
counter atomic.Value
}
func (m testModel) Init() Cmd {
return nil
}
func (m *testModel) Update(msg Msg) (Model, Cmd) {
switch msg.(type) {
case incrementMsg:
i := m.counter.Load()
if i == nil {
m.counter.Store(1)
} else {
m.counter.Store(i.(int) + 1)
}
case KeyMsg:
return m, Quit
}
return m, nil
}
func (m *testModel) View() string {
m.executed.Store(true)
return "success\n"
}
func TestTeaModel(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
in.Write([]byte("q"))
ctx, cancel := context.WithTimeout(context.TODO(), 3*time.Second)
defer cancel()
p := NewProgram(&testModel{}, WithInput(&in), WithOutput(&buf), WithContext(ctx))
if _, err := p.Run(); err != nil {
t.Fatal(err)
}
if buf.Len() == 0 {
t.Fatal("no output")
}
}
func TestTeaQuit(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
m := &testModel{}
p := NewProgram(m, WithInput(&in), WithOutput(&buf))
go func() {
for {
time.Sleep(time.Millisecond)
if m.executed.Load() != nil {
p.Quit()
return
}
}
}()
if _, err := p.Run(); err != nil {
t.Fatal(err)
}
}
func TestTeaWithFilter(t *testing.T) {
testTeaWithFilter(t, 0)
testTeaWithFilter(t, 1)
testTeaWithFilter(t, 2)
}
func testTeaWithFilter(t *testing.T, preventCount uint32) {
var buf bytes.Buffer
var in bytes.Buffer
m := &testModel{}
shutdowns := uint32(0)
p := NewProgram(m,
WithInput(&in),
WithOutput(&buf),
WithFilter(func(_ Model, msg Msg) Msg {
if _, ok := msg.(QuitMsg); !ok {
return msg
}
if shutdowns < preventCount {
atomic.AddUint32(&shutdowns, 1)
return nil
}
return msg
}))
go func() {
for atomic.LoadUint32(&shutdowns) <= preventCount {
time.Sleep(time.Millisecond)
p.Quit()
}
}()
if err := p.Start(); err != nil {
t.Fatal(err)
}
if shutdowns != preventCount {
t.Errorf("Expected %d prevented shutdowns, got %d", preventCount, shutdowns)
}
}
func TestTeaKill(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
m := &testModel{}
p := NewProgram(m, WithInput(&in), WithOutput(&buf))
go func() {
for {
time.Sleep(time.Millisecond)
if m.executed.Load() != nil {
p.Kill()
return
}
}
}()
if _, err := p.Run(); !errors.Is(err, ErrProgramKilled) {
t.Fatalf("Expected %v, got %v", ErrProgramKilled, err)
}
}
func TestTeaContext(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
var buf bytes.Buffer
var in bytes.Buffer
m := &testModel{}
p := NewProgram(m, WithContext(ctx), WithInput(&in), WithOutput(&buf))
go func() {
for {
time.Sleep(time.Millisecond)
if m.executed.Load() != nil {
cancel()
return
}
}
}()
if _, err := p.Run(); !errors.Is(err, ErrProgramKilled) {
t.Fatalf("Expected %v, got %v", ErrProgramKilled, err)
}
}
func TestTeaBatchMsg(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
inc := func() Msg {
return incrementMsg{}
}
m := &testModel{}
p := NewProgram(m, WithInput(&in), WithOutput(&buf))
go func() {
p.Send(BatchMsg{inc, inc})
for {
time.Sleep(time.Millisecond)
i := m.counter.Load()
if i != nil && i.(int) >= 2 {
p.Quit()
return
}
}
}()
if _, err := p.Run(); err != nil {
t.Fatal(err)
}
if m.counter.Load() != 2 {
t.Fatalf("counter should be 2, got %d", m.counter.Load())
}
}
func TestTeaSequenceMsg(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
inc := func() Msg {
return incrementMsg{}
}
m := &testModel{}
p := NewProgram(m, WithInput(&in), WithOutput(&buf))
go p.Send(sequenceMsg{inc, inc, Quit})
if _, err := p.Run(); err != nil {
t.Fatal(err)
}
if m.counter.Load() != 2 {
t.Fatalf("counter should be 2, got %d", m.counter.Load())
}
}
func TestTeaSequenceMsgWithBatchMsg(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
inc := func() Msg {
return incrementMsg{}
}
batch := func() Msg {
return BatchMsg{inc, inc}
}
m := &testModel{}
p := NewProgram(m, WithInput(&in), WithOutput(&buf))
go p.Send(sequenceMsg{batch, inc, Quit})
if _, err := p.Run(); err != nil {
t.Fatal(err)
}
if m.counter.Load() != 3 {
t.Fatalf("counter should be 3, got %d", m.counter.Load())
}
}
func TestTeaSend(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
m := &testModel{}
p := NewProgram(m, WithInput(&in), WithOutput(&buf))
// sending before the program is started is a blocking operation
go p.Send(Quit())
if _, err := p.Run(); err != nil {
t.Fatal(err)
}
// sending a message after program has quit is a no-op
p.Send(Quit())
}
func TestTeaNoRun(t *testing.T) {
var buf bytes.Buffer
var in bytes.Buffer
m := &testModel{}
NewProgram(m, WithInput(&in), WithOutput(&buf))
}