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app_test.go
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app_test.go
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// Copyright (c) 2020-2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package fx_test
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"log"
"os"
"reflect"
"runtime"
"strings"
"testing"
"time"
"github.com/benbjohnson/clock"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
. "go.uber.org/fx"
"go.uber.org/fx/fxevent"
"go.uber.org/fx/fxtest"
"go.uber.org/fx/internal/fxlog"
"go.uber.org/goleak"
"go.uber.org/multierr"
"go.uber.org/zap"
)
func NewForTest(tb testing.TB, opts ...Option) *App {
testOpts := []Option{
// Provide both: Logger and WithLogger so that if the test
// WithLogger fails, we don't pollute stderr.
Logger(fxtest.NewTestPrinter(tb)),
WithLogger(func() fxevent.Logger { return fxtest.NewTestLogger(tb) }),
}
opts = append(testOpts, opts...)
return New(opts...)
}
func NewSpied(opts ...Option) (*App, *fxlog.Spy) {
spy := new(fxlog.Spy)
opts = append([]Option{
WithLogger(func() fxevent.Logger { return spy }),
}, opts...)
return New(opts...), spy
}
func validateTestApp(tb testing.TB, opts ...Option) error {
testOpts := []Option{
// Provide both: Logger and WithLogger so that if the test
// WithLogger fails, we don't pollute stderr.
Logger(fxtest.NewTestPrinter(tb)),
WithLogger(func() fxevent.Logger { return fxtest.NewTestLogger(tb) }),
}
opts = append(testOpts, opts...)
return ValidateApp(opts...)
}
func TestNewApp(t *testing.T) {
t.Parallel()
t.Run("ProvidesLifecycleAndShutdowner", func(t *testing.T) {
t.Parallel()
var (
l Lifecycle
s Shutdowner
)
fxtest.New(
t,
Populate(&l, &s),
)
assert.NotNil(t, l)
assert.NotNil(t, s)
})
t.Run("OptionsHappensBeforeProvides", func(t *testing.T) {
t.Parallel()
// Should be grouping all provides and pushing them into the container
// after applying other options. This prevents the app configuration
// (e.g., logging) from changing halfway through our provides.
spy := new(fxlog.Spy)
app := fxtest.New(t, Provide(func() struct{} { return struct{}{} }),
WithLogger(func() fxevent.Logger { return spy }))
defer app.RequireStart().RequireStop()
require.Equal(t,
[]string{"Provided", "Provided", "Provided", "Provided", "LoggerInitialized", "Started"},
spy.EventTypes())
assert.Contains(t, spy.Events()[0].(*fxevent.Provided).OutputTypeNames, "struct {}")
})
t.Run("CircularGraphReturnsError", func(t *testing.T) {
t.Parallel()
type A struct{}
type B struct{}
app := NewForTest(t,
Provide(func(A) B { return B{} }),
Provide(func(B) A { return A{} }),
Invoke(func(B) {}),
)
err := app.Err()
require.Error(t, err, "fx.New should return an error")
errMsg := err.Error()
assert.Contains(t, errMsg, "cycle detected in dependency graph")
assert.Contains(t, errMsg, "depends on func(fx_test.B) fx_test.A")
assert.Contains(t, errMsg, "depends on func(fx_test.A) fx_test.B")
})
t.Run("ProvidesDotGraph", func(t *testing.T) {
t.Parallel()
type A struct{}
type B struct{}
type C struct{}
var g DotGraph
app := fxtest.New(t,
Provide(func() A { return A{} }),
Provide(func(A) B { return B{} }),
Provide(func(A, B) C { return C{} }),
Populate(&g),
)
defer app.RequireStart().RequireStop()
require.NoError(t, app.Err())
assert.Contains(t, g, `"fx.DotGraph" [label=<fx.DotGraph>];`)
})
t.Run("ProvidesWithAnnotate", func(t *testing.T) {
t.Parallel()
type A struct{}
type B struct {
In
Foo A `name:"foo"`
Bar A `name:"bar"`
Foos []A `group:"foo"`
}
app := fxtest.New(t,
Provide(
Annotated{
Target: func() A { return A{} },
Name: "foo",
},
Annotated{
Target: func() A { return A{} },
Name: "bar",
},
Annotated{
Target: func() A { return A{} },
Group: "foo",
},
),
Invoke(
func(b B) {
assert.NotNil(t, b.Foo)
assert.NotNil(t, b.Bar)
assert.Len(t, b.Foos, 1)
},
),
)
defer app.RequireStart().RequireStop()
require.NoError(t, app.Err())
})
t.Run("ProvidesWithAnnotateFlattened", func(t *testing.T) {
t.Parallel()
app := fxtest.New(t,
Provide(Annotated{
Target: func() []int { return []int{1} },
Group: "foo,flatten",
}),
Invoke(
func(b struct {
In
Foos []int `group:"foo"`
}) {
assert.Len(t, b.Foos, 1)
},
),
)
defer app.RequireStart().RequireStop()
require.NoError(t, app.Err())
})
t.Run("ProvidesWithEmptyAnnotate", func(t *testing.T) {
t.Parallel()
type A struct{}
type B struct {
In
Foo A
}
app := fxtest.New(t,
Provide(
Annotated{
Target: func() A { return A{} },
},
),
Invoke(
func(b B) {
assert.NotNil(t, b.Foo)
},
),
)
defer app.RequireStart().RequireStop()
require.NoError(t, app.Err())
})
t.Run("CannotNameAndGroup", func(t *testing.T) {
t.Parallel()
type A struct{}
app := NewForTest(t,
Provide(
Annotated{
Target: func() A { return A{} },
Name: "foo",
Group: "bar",
},
),
)
err := app.Err()
require.Error(t, err)
// fx.Annotated may specify only one of Name or Group: received fx.Annotated{Name: "foo", Group: "bar", Target: go.uber.org/fx_test.TestAnnotatedWithGroupAndName.func1()} from:
// go.uber.org/fx_test.TestAnnotatedWithGroupAndName
// /.../fx/annotated_test.go:164
// testing.tRunner
// /.../go/1.13.3/libexec/src/testing/testing.go:909
assert.Contains(t, err.Error(), "fx.Annotated may specify only one of Name or Group:")
assert.Contains(t, err.Error(), `received fx.Annotated{Name: "foo", Group: "bar", Target: go.uber.org/fx_test.TestNewApp`)
assert.Contains(t, err.Error(), "go.uber.org/fx_test.TestNewApp")
assert.Contains(t, err.Error(), "/app_test.go")
})
t.Run("ErrorProvidingAnnotated", func(t *testing.T) {
t.Parallel()
app := NewForTest(t, Provide(Annotated{
Target: 42, // not a constructor
Name: "foo",
}))
err := app.Err()
require.Error(t, err)
// Example:
// fx.Provide(fx.Annotated{...}) from:
// go.uber.org/fx_test.TestNewApp.func8
// /.../fx/app_test.go:206
// testing.tRunner
// /.../go/1.13.3/libexec/src/testing/testing.go:909
// Failed: must provide constructor function, got 42 (type int)
assert.Contains(t, err.Error(), `fx.Provide(fx.Annotated{Name: "foo", Target: 42}) from:`)
assert.Contains(t, err.Error(), "go.uber.org/fx_test.TestNewApp")
assert.Contains(t, err.Error(), "/app_test.go")
assert.Contains(t, err.Error(), "Failed: must provide constructor function")
})
t.Run("ErrorProvidingAnnotate", func(t *testing.T) {
t.Parallel()
type t1 struct{}
newT1 := func() t1 { return t1{} }
// Provide twice.
app := NewForTest(t, Provide(
Annotate(newT1, ResultTags(`name:"foo"`)),
Annotate(newT1, ResultTags(`name:"foo"`)),
))
err := app.Err()
require.Error(t, err)
// Example:
// fx.Provide(fx.Annotate(go.uber.org/fx_test.TestNewApp.func10.1(), fx.ResultTags(["name:\"foo\""])) from:
// go.uber.org/fx_test.TestNewApp.func10
// /.../fx/app_test.go:305
// testing.tRunner
// /.../src/testing/testing.go:1259
// Failed: cannot provide function "reflect".makeFuncStub (/.../reflect/asm_amd64.s:30):
// cannot provide fx_test.t1[name="foo"] from [0].Field0:
// already provided by "reflect".makeFuncStub (/.../reflect/asm_amd64.s:30)
assert.Contains(t, err.Error(), `fx.Provide(fx.Annotate(`)
assert.Contains(t, err.Error(), `fx.ResultTags(["name:\"foo\""])`)
assert.Contains(t, err.Error(), "already provided")
})
t.Run("ErrorProviding", func(t *testing.T) {
t.Parallel()
err := NewForTest(t, Provide(42)).Err()
require.Error(t, err)
// Example:
// fx.Provide(..) from:
// go.uber.org/fx_test.TestNewApp.func8
// /.../fx/app_test.go:206
// testing.tRunner
// /.../go/1.13.3/libexec/src/testing/testing.go:909
// Failed: must provide constructor function, got 42 (type int)
assert.Contains(t, err.Error(), "fx.Provide(42) from:")
assert.Contains(t, err.Error(), "go.uber.org/fx_test.TestNewApp")
assert.Contains(t, err.Error(), "/app_test.go")
assert.Contains(t, err.Error(), "Failed: must provide constructor function")
})
t.Run("Decorates", func(t *testing.T) {
t.Parallel()
spy := new(fxlog.Spy)
type A struct{ value int }
app := fxtest.New(t,
Provide(func() A { return A{value: 0} }),
Decorate(func(a A) A { return A{value: a.value + 1} }),
Invoke(func(a A) { assert.Equal(t, a.value, 1) }),
WithLogger(func() fxevent.Logger { return spy }))
defer app.RequireStart().RequireStop()
require.Equal(t,
[]string{"Provided", "Provided", "Provided", "Provided", "Decorated", "LoggerInitialized", "Invoking", "Invoked", "Started"},
spy.EventTypes())
})
t.Run("DecoratesFromManyModules", func(t *testing.T) {
t.Parallel()
spy := new(fxlog.Spy)
type A struct{ value int }
m := Module("decorator",
Decorate(func(a A) A { return A{value: a.value + 1} }),
)
app := fxtest.New(t,
m,
Provide(func() A { return A{value: 0} }),
Decorate(func(a A) A { return A{value: a.value + 1} }),
WithLogger(func() fxevent.Logger { return spy }),
)
defer app.RequireStart().RequireStop()
require.Equal(t,
[]string{"Provided", "Provided", "Provided", "Provided", "Decorated", "Decorated", "LoggerInitialized", "Started"},
spy.EventTypes())
})
}
func TestWithLoggerErrorUseDefault(t *testing.T) {
// This test cannot be run in paralllel with the others because
// it hijacks stderr.
// Temporarily hijack stderr and restore it after this test so
// that we can assert its contents.
f, err := os.CreateTemp(t.TempDir(), "stderr")
if err != nil {
t.Fatalf("could not open a file for writing")
}
defer func(oldStderr *os.File) {
assert.NoError(t, f.Close())
os.Stderr = oldStderr
}(os.Stderr)
os.Stderr = f
app := New(
Supply(zap.NewNop()),
WithLogger(&bytes.Buffer{}),
)
err = app.Err()
require.Error(t, err)
assert.Contains(t,
err.Error(),
"must provide constructor function, got (type *bytes.Buffer)",
)
stderr, err := os.ReadFile(f.Name())
require.NoError(t, err)
// Example output:
// [Fx] SUPPLY *zap.Logger
// [Fx] ERROR Failed to initialize custom logger: fx.WithLogger() from:
// go.uber.org/fx_test.TestSetupLogger.func3
// /Users/abg/dev/fx/app_test.go:334
// testing.tRunner
// /usr/local/Cellar/go/1.16.4/libexec/src/testing/testing.go:1193
// Failed: must provide constructor function, got (type *bytes.Buffer)
out := string(stderr)
assert.Contains(t, out, "[Fx] SUPPLY\t*zap.Logger\n")
assert.Contains(t, out, "[Fx] ERROR\t\tFailed to initialize custom logger: fx.WithLogger")
assert.Contains(t, out, "must provide constructor function, got (type *bytes.Buffer)\n")
}
func TestWithLogger(t *testing.T) {
t.Parallel()
t.Run("initializing custom logger", func(t *testing.T) {
t.Parallel()
var spy fxlog.Spy
app := fxtest.New(t,
Supply(&spy),
WithLogger(func(spy *fxlog.Spy) fxevent.Logger {
return spy
}),
)
assert.Equal(t, []string{
"Supplied", "Provided", "Provided", "Provided", "LoggerInitialized",
}, spy.EventTypes())
spy.Reset()
app.RequireStart().RequireStop()
require.NoError(t, app.Err())
assert.Equal(t, []string{"Started", "Stopped"}, spy.EventTypes())
})
t.Run("error in Provide shows logs", func(t *testing.T) {
t.Parallel()
var spy fxlog.Spy
app := New(
Supply(&spy),
WithLogger(func(spy *fxlog.Spy) fxevent.Logger {
return spy
}),
Provide(&bytes.Buffer{}), // not passing in a constructor.
)
err := app.Err()
require.Error(t, err)
assert.Contains(t,
err.Error(),
"must provide constructor function, got (type *bytes.Buffer)",
)
assert.Equal(t, []string{"Supplied", "Provided", "LoggerInitialized"}, spy.EventTypes())
})
t.Run("logger failed to build", func(t *testing.T) {
t.Parallel()
var buff bytes.Buffer
app := New(
Logger(log.New(&buff, "", 0)),
WithLogger(func() (fxevent.Logger, error) {
return nil, errors.New("great sadness")
}),
)
err := app.Err()
require.Error(t, err)
assert.Contains(t, err.Error(), "great sadness")
out := buff.String()
assert.Contains(t, out, "[Fx] ERROR\t\tFailed to initialize custom logger")
})
t.Run("logger dependency failed to build", func(t *testing.T) {
t.Parallel()
var buff bytes.Buffer
app := New(
Logger(log.New(&buff, "", 0)),
Provide(func() (*zap.Logger, error) {
return nil, errors.New("great sadness")
}),
WithLogger(func(log *zap.Logger) fxevent.Logger {
t.Errorf("WithLogger must not be called")
panic("must not be called")
}),
)
err := app.Err()
require.Error(t, err)
assert.Contains(t, err.Error(), "great sadness")
out := buff.String()
assert.Contains(t, out, "[Fx] PROVIDE\t*zap.Logger")
assert.Contains(t, out, "[Fx] ERROR\t\tFailed to initialize custom logger")
})
}
type errHandlerFunc func(error)
func (f errHandlerFunc) HandleError(err error) { f(err) }
func TestInvokes(t *testing.T) {
t.Parallel()
t.Run("Success event", func(t *testing.T) {
t.Parallel()
app, spy := NewSpied(
Invoke(func() {}),
)
require.NoError(t, app.Err())
invoked := spy.Events().SelectByTypeName("Invoked")
require.Len(t, invoked, 1)
assert.NoError(t, invoked[0].(*fxevent.Invoked).Err)
})
t.Run("Failure event", func(t *testing.T) {
t.Parallel()
app, spy := NewSpied(
Invoke(func() error {
return errors.New("great sadness")
}),
)
require.Error(t, app.Err())
invoked := spy.Events().SelectByTypeName("Invoked")
require.Len(t, invoked, 1)
assert.Error(t, invoked[0].(*fxevent.Invoked).Err)
})
t.Run("ErrorsAreNotOverriden", func(t *testing.T) {
t.Parallel()
type A struct{}
type B struct{}
app := NewForTest(t,
Provide(func() B { return B{} }), // B inserted into the graph
Invoke(func(A) {}), // failed A invoke
Invoke(func(B) {}), // successful B invoke
)
err := app.Err()
require.Error(t, err)
assert.Contains(t, err.Error(), "missing type: fx_test.A")
})
t.Run("ErrorHooksAreCalled", func(t *testing.T) {
t.Parallel()
type A struct{}
count := 0
h := errHandlerFunc(func(err error) {
count++
})
NewForTest(t,
Invoke(func(A) {}),
ErrorHook(h),
)
assert.Equal(t, 1, count)
})
}
func TestError(t *testing.T) {
t.Parallel()
t.Run("NilErrorOption", func(t *testing.T) {
t.Parallel()
var invoked bool
app := NewForTest(t,
Error(nil),
Invoke(func() { invoked = true }),
)
err := app.Err()
require.NoError(t, err)
assert.True(t, invoked)
})
t.Run("SingleErrorOption", func(t *testing.T) {
t.Parallel()
app := NewForTest(t,
Error(errors.New("module failure")),
Invoke(func() { t.Errorf("Invoke should not be called") }),
)
err := app.Err()
assert.EqualError(t, err, "module failure")
})
t.Run("MultipleErrorOption", func(t *testing.T) {
t.Parallel()
type A struct{}
app := NewForTest(t,
Provide(func() A {
t.Errorf("Provide should not be called")
return A{}
},
),
Invoke(func(A) { t.Errorf("Invoke should not be called") }),
Error(
errors.New("module A failure"),
errors.New("module B failure"),
),
)
err := app.Err()
require.Error(t, err)
assert.Contains(t, err.Error(), "module A failure")
assert.Contains(t, err.Error(), "module B failure")
assert.NotContains(t, err.Error(), "not in the container")
})
t.Run("ProvideAndInvokeErrorsAreIgnored", func(t *testing.T) {
t.Parallel()
type A struct{}
type B struct{}
app := NewForTest(t,
Provide(func(b B) A {
t.Errorf("B is missing from the container; Provide should not be called")
return A{}
},
),
Error(errors.New("module failure")),
Invoke(func(A) { t.Errorf("A was not provided; Invoke should not be called") }),
)
err := app.Err()
assert.EqualError(t, err, "module failure")
})
}
func TestOptions(t *testing.T) {
t.Parallel()
t.Run("OptionsComposition", func(t *testing.T) {
t.Parallel()
var n int
construct := func() struct{} {
n++
return struct{}{}
}
use := func(struct{}) {
n++
}
app := fxtest.New(t, Options(Provide(construct), Invoke(use)))
defer app.RequireStart().RequireStop()
assert.Equal(t, 2, n)
})
t.Run("ProvidesCalledInGraphOrder", func(t *testing.T) {
t.Parallel()
type type1 struct{}
type type2 struct{}
type type3 struct{}
initOrder := 0
new1 := func() type1 {
initOrder++
assert.Equal(t, 1, initOrder)
return type1{}
}
new2 := func(type1) type2 {
initOrder++
assert.Equal(t, 2, initOrder)
return type2{}
}
new3 := func(type1, type2) type3 {
initOrder++
assert.Equal(t, 3, initOrder)
return type3{}
}
biz := func(s1 type1, s2 type2, s3 type3) {
initOrder++
assert.Equal(t, 4, initOrder)
}
app := fxtest.New(t,
Provide(new1, new2, new3),
Invoke(biz),
)
defer app.RequireStart().RequireStop()
assert.Equal(t, 4, initOrder)
})
t.Run("ProvidesCalledLazily", func(t *testing.T) {
t.Parallel()
count := 0
newBuffer := func() *bytes.Buffer {
t.Error("this module should not init: no provided type relies on it")
return nil
}
newEmpty := func() struct{} {
count++
return struct{}{}
}
app := fxtest.New(t,
Provide(newBuffer, newEmpty),
Invoke(func(struct{}) { count++ }),
)
defer app.RequireStart().RequireStop()
assert.Equal(t, 2, count)
})
t.Run("Error", func(t *testing.T) {
t.Parallel()
spy := new(fxlog.Spy)
New(
Provide(&bytes.Buffer{}), // error, not a constructor
WithLogger(func() fxevent.Logger { return spy }),
)
require.Equal(t, []string{"Provided", "LoggerInitialized"}, spy.EventTypes())
assert.Contains(t, spy.Events()[0].(*fxevent.Provided).Err.Error(), "must provide constructor function")
})
}
func TestTimeoutOptions(t *testing.T) {
t.Parallel()
const timeout = time.Minute
// Further assertions can't succeed unless the test timeout is greater than the default.
require.True(t, timeout > DefaultTimeout, "test assertions require timeout greater than default")
var started, stopped bool
assertCustomContext := func(ctx context.Context, phase string) {
deadline, ok := ctx.Deadline()
if assert.True(t, ok, "no %s deadline", phase) {
remaining := time.Until(deadline)
assert.True(t, remaining > DefaultTimeout, "didn't respect customized %s timeout", phase)
}
}
verify := func(lc Lifecycle) {
lc.Append(Hook{
OnStart: func(ctx context.Context) error {
assertCustomContext(ctx, "start")
started = true
return nil
},
OnStop: func(ctx context.Context) error {
assertCustomContext(ctx, "stop")
stopped = true
return nil
},
})
}
app := fxtest.New(
t,
Invoke(verify),
StartTimeout(timeout),
StopTimeout(timeout),
)
app.RequireStart().RequireStop()
assert.True(t, started, "app wasn't started")
assert.True(t, stopped, "app wasn't stopped")
}
func TestAppRunTimeout(t *testing.T) {
t.Parallel()
// Fails with an error immediately.
failure := func(context.Context) error {
return errors.New("great sadness")
}
// Builds a hook that takes much longer than the application timeout.
takeVeryLong := func(clock *clock.Mock) func(ctx context.Context) error {
return func(ctx context.Context) error {
// We'll exceed the start and stop timeouts,
// and then some.
for i := 0; i < 3; i++ {
clock.Add(time.Second)
}
return errors.New("user should not see this")
}
}
tests := []struct {
desc string
// buildHook builds and returns the hooks for this test case.
buildHooks func(*clock.Mock) []Hook
// Type of the fxevent we want.
// Does not reflect the exact value.
wantEventType fxevent.Event
}{
{
// Timeout starting an application.
desc: "OnStart timeout",
buildHooks: func(clock *clock.Mock) []Hook {
return []Hook{
{OnStart: takeVeryLong(clock)},
}
},
wantEventType: &fxevent.Started{},
},
{
// Timeout during a rollback because start failed.
desc: "rollback timeout",
buildHooks: func(clock *clock.Mock) []Hook {
return []Hook{
// The hooks are separate because
// OnStop will not be run if that hook failed.
{OnStop: takeVeryLong(clock)},
{OnStart: failure},
}
},
wantEventType: &fxevent.Started{},
},
{
// Timeout during a stop.
desc: "OnStop timeout",
buildHooks: func(clock *clock.Mock) []Hook {
return []Hook{
{OnStop: takeVeryLong(clock)},
}
},
wantEventType: &fxevent.Stopped{},
},
}
for _, tt := range tests {
tt := tt
t.Run(tt.desc, func(t *testing.T) {
t.Parallel()
mockClock := clock.NewMock()
var (
exitCode int
exited bool
)
exit := func(code int) {
exited = true
exitCode = code
}
defer func() {
assert.True(t, exited,
"os.Exit must be called")
}()
// If the OnStart hook for this is invoked,
// it means that the Start did not fail.
// In that case, shut down immediately
// rather than block forever.
shutdown := func(sd Shutdowner, lc Lifecycle) {
lc.Append(Hook{
OnStart: func(context.Context) error {
return sd.Shutdown()
},
})
}
app, spy := NewSpied(
StartTimeout(time.Second),
StopTimeout(time.Second),
WithExit(exit),
WithClock(mockClock),
Invoke(func(lc Lifecycle) {
hooks := tt.buildHooks(mockClock)
for _, h := range hooks {
lc.Append(h)
}
}),
Invoke(shutdown),
)
app.Run()
assert.NotZero(t, exitCode,
"exit code mismatch")
eventType := reflect.TypeOf(tt.wantEventType).Elem().Name()
matchingEvents := spy.Events().SelectByTypeName(eventType)
require.Len(t, matchingEvents, 1,
"expected a %q event", eventType)
event := matchingEvents[0]
errv := reflect.ValueOf(event).Elem().FieldByName("Err")
require.True(t, errv.IsValid(),
"event %q does not have an Err attribute", eventType)
err, _ := errv.Interface().(error)
assert.ErrorIs(t, err, context.DeadlineExceeded,
"should fail because of a timeout")
})
}
}
func TestAppStart(t *testing.T) {
t.Parallel()
t.Run("Timeout", func(t *testing.T) {
t.Parallel()
mockClock := clock.NewMock()
type A struct{}
blocker := func(lc Lifecycle) *A {
lc.Append(
Hook{
OnStart: func(ctx context.Context) error {
mockClock.Add(5 * time.Second)
return ctx.Err()
},
},
)
return &A{}
}
// NOTE: for tests that gets cancelled/times out during lifecycle methods, it's possible
// for them to run into race with fxevent logs getting written to testing.T with the
// remainder of the tests. As a workaround, we provide fxlog.Spy to prevent the lifecycle
// goroutine from writing to testing.T.
spy := new(fxlog.Spy)
app := New(
WithLogger(func() fxevent.Logger { return spy }),
WithClock(mockClock),
Provide(blocker),
Invoke(func(*A) {}),
)
ctx, cancel := mockClock.WithTimeout(context.Background(), time.Second)
err := app.Start(ctx)
require.Error(t, err)
assert.Contains(t, err.Error(), "OnStart hook added by go.uber.org/fx_test.TestAppStart.func1.1 failed: context deadline exceeded")
cancel()
})
t.Run("TimeoutWithFinishedHooks", func(t *testing.T) {
t.Parallel()
mockClock := clock.NewMock()
type A struct{}
type B struct{ A *A }
type C struct{ B *B }
newA := func(lc Lifecycle) *A {
lc.Append(
Hook{
OnStart: func(context.Context) error {
mockClock.Add(100 * time.Millisecond)
return nil
},
},
)
return &A{}
}
newB := func(lc Lifecycle, a *A) *B {
lc.Append(
Hook{
OnStart: func(context.Context) error {
mockClock.Add(300 * time.Millisecond)
return nil
},
},
)
return &B{a}
}
newC := func(lc Lifecycle, b *B) *C {
lc.Append(
Hook{
OnStart: func(ctx context.Context) error {
mockClock.Add(5 * time.Second)
return ctx.Err()