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executor.go
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executor.go
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package testutil
import (
"context"
"fmt"
"sync/atomic"
"testing"
"github.com/stretchr/testify/assert"
"github.com/failsafe-go/failsafe-go"
)
// Given performs pre-test setup that may involve resetting state so that the same fixtures can be used for sync and async tests.
type Given func() context.Context
type WhenRun[R any] func(execution failsafe.Execution[R]) error
type WhenGet[R any] func(execution failsafe.Execution[R]) (R, error)
type Resetable interface {
Reset()
}
type Tester[R any] struct {
t *testing.T
// Given
given func() context.Context
// When
executor failsafe.Executor[R]
run WhenRun[R]
get WhenGet[R]
// Then
then func()
expectedAttempts int
expectedExecutions int
expectedResult R
expectedError *error
expectedSuccess bool
expectedFailure bool
}
func Test[R any](t *testing.T) *Tester[R] {
return &Tester[R]{
t: t,
}
}
func (t *Tester[R]) Setup(fn func()) *Tester[R] {
t.given = func() context.Context {
fn()
return nil
}
return t
}
func (t *Tester[R]) Context(fn func() context.Context) *Tester[R] {
t.given = fn
return t
}
func (t *Tester[R]) Reset(stats ...Resetable) *Tester[R] {
t.given = func() context.Context {
for _, s := range stats {
s.Reset()
}
return nil
}
return t
}
func (t *Tester[R]) With(policies ...failsafe.Policy[R]) *Tester[R] {
t.executor = failsafe.NewExecutor[R](policies...)
return t
}
func (t *Tester[R]) WithExecutor(executor failsafe.Executor[R]) *Tester[R] {
t.executor = executor
return t
}
func (t *Tester[R]) Run(when WhenRun[R]) *Tester[R] {
t.run = when
return t
}
func (t *Tester[R]) Get(when WhenGet[R]) *Tester[R] {
t.get = when
return t
}
func (t *Tester[R]) AssertSuccess(expectedAttempts int, expectedExecutions int, expectedResult R, then ...func()) {
t.expectedSuccess = true
t.expectedAttempts = expectedAttempts
t.expectedExecutions = expectedExecutions
t.expectedResult = expectedResult
if len(then) > 0 {
t.then = then[0]
}
t.do()
}
func (t *Tester[R]) AssertSuccessError(expectedAttempts int, expectedExecutions int, expectedError error, then ...func()) {
t.expectedError = &expectedError
t.AssertSuccess(expectedAttempts, expectedExecutions, *(new(R)), then...)
}
func (t *Tester[R]) AssertFailure(expectedAttempts int, expectedExecutions int, expectedError error, then ...func()) {
t.expectedFailure = true
t.expectedAttempts = expectedAttempts
t.expectedExecutions = expectedExecutions
t.expectedError = &expectedError
if len(then) > 0 {
t.then = then[0]
}
t.do()
}
func (t *Tester[R]) do() {
test := func(async bool) {
executorFn, assertFn := PrepareTest(t.t, t.given, t.executor, t.expectedAttempts, t.expectedExecutions, t.expectedResult, t.expectedError, t.expectedSuccess, t.expectedFailure, t.then)
// Execute
var result R
var err error
executor := executorFn()
if t.run != nil {
if !async {
err = executor.RunWithExecutionAsync(t.run).Error()
} else {
err = executor.RunWithExecution(t.run)
}
} else {
if !async {
result, err = executor.GetWithExecution(t.get)
} else {
result, err = executor.GetWithExecutionAsync(t.get).Get()
}
}
assertFn(result, err)
}
// Run sync
fmt.Println("Testing sync")
test(false)
// Run async
fmt.Println("\nTesting async")
test(true)
}
func PrepareTest[R any](t *testing.T, given Given, executor failsafe.Executor[R], expectedAttempts int, expectedExecutions int, expectedResult R,
expectedError *error, expectedSuccess bool, expectedFailure bool, then func()) (executorFn func() failsafe.Executor[R], assertResult func(R, error)) {
if given != nil {
if ctx := given(); ctx != nil {
executor = executor.WithContext(ctx)
}
}
var doneEvent atomic.Pointer[failsafe.ExecutionDoneEvent[R]]
var onSuccessCalled atomic.Bool
var onFailureCalled atomic.Bool
executorFn = func() failsafe.Executor[R] {
return executor.OnDone(func(e failsafe.ExecutionDoneEvent[R]) {
doneEvent.Store(&e)
}).OnSuccess(func(e failsafe.ExecutionDoneEvent[R]) {
onSuccessCalled.Store(true)
}).OnFailure(func(e failsafe.ExecutionDoneEvent[R]) {
onFailureCalled.Store(true)
})
}
assertResult = func(result R, err error) {
if then != nil {
then()
}
if doneEvent.Load() != nil {
if expectedAttempts != -1 {
assert.Equal(t, expectedAttempts, doneEvent.Load().Attempts(), "expected attempts did not match")
}
if expectedExecutions != -1 {
assert.Equal(t, expectedExecutions, doneEvent.Load().Executions(), "expected executions did not match")
}
}
assert.Equal(t, expectedResult, result, "expected result did not match")
if expectedError == nil {
assert.Nil(t, err, " error should be nil")
} else {
assert.ErrorIs(t, err, *expectedError, "expected error did not match")
}
if expectedSuccess {
assert.True(t, onSuccessCalled.Load(), "onSuccess should have been called")
assert.False(t, onFailureCalled.Load(), "onFailure should not have been called")
} else if expectedFailure {
assert.False(t, onSuccessCalled.Load(), "onSuccess should not have been called")
assert.True(t, onFailureCalled.Load(), "onFailure should have been called")
}
}
return executorFn, assertResult
}