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main_test.go
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main_test.go
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package main
import (
"errors"
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/sony/gobreaker"
)
func TestCircuitBreakerV3(t *testing.T) {
// Create a mock server to simulate external API
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte("OK"))
}))
defer server.Close()
// Replace callExternalAPI with a function that calls the mock server
callExternalAPI = func() (int, error) {
resp, err := http.Get(server.URL)
if err != nil {
return 0, err
}
defer resp.Body.Close()
return resp.StatusCode, nil
}
// Configure circuit breaker settings for testing
settings := gobreaker.Settings{
Name: "API Circuit Breaker",
MaxRequests: 5,
Interval: 60 * time.Second,
Timeout: 5 * time.Second,
ReadyToTrip: func(counts gobreaker.Counts) bool {
return counts.ConsecutiveFailures > 3
},
}
cb := gobreaker.NewCircuitBreaker(settings)
t.Run("SuccessfulRequest", func(t *testing.T) {
_, err := cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err != nil {
t.Fatalf("expected no error, got %v", err)
}
})
//Simulates consecutive failed requests and checks if the circuit breaker trips to the open state.
t.Run("FailedRequests", func(t *testing.T) {
// Override callExternalAPI to simulate failure
callExternalAPI = func() (int, error) {
return 0, errors.New("simulated failure")
}
for i := 0; i < 4; i++ {
_, err := cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err == nil {
t.Fatalf("expected error, got none")
}
}
if cb.State() != gobreaker.StateOpen {
t.Fatalf("expected circuit breaker to be open, got %v", cb.State())
}
})
//Simulates the circuit breaker being open,
//waits for the timeout,
//then checks if it closes again after a successful request.
t.Run("RetryAfterTimeout", func(t *testing.T) {
// Simulate circuit breaker opening
callExternalAPI = func() (int, error) {
return 0, errors.New("simulated failure")
}
for i := 0; i < 4; i++ {
_, err := cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err == nil {
t.Fatalf("expected error, got none")
}
}
if cb.State() != gobreaker.StateOpen {
t.Fatalf("expected circuit breaker to be open, got %v", cb.State())
}
// Wait for timeout duration
time.Sleep(settings.Timeout + 1*time.Second)
//After the timeout period,
//the circuit breaker should transition to the half-open state.
// Restore original callExternalAPI to simulate success
callExternalAPI = func() (int, error) {
resp, err := http.Get(server.URL)
if err != nil {
return 0, err
}
defer resp.Body.Close()
return resp.StatusCode, nil
}
_, err := cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err != nil {
t.Fatalf("expected no error, got %v", err)
}
if cb.State() != gobreaker.StateHalfOpen {
t.Fatalf("expected circuit breaker to be half-open, got %v", cb.State())
}
//After verifying the half-open state, another successful request is simulated to ensure the circuit breaker transitions back to the closed state.
for i := 0; i < int(settings.MaxRequests); i++ {
_, err = cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err != nil {
t.Fatalf("expected no error, got %v", err)
}
}
if cb.State() != gobreaker.StateClosed {
t.Fatalf("expected circuit breaker to be closed, got %v", cb.State())
}
})
t.Run("OnStateChange", func(t *testing.T) {
stateChanges := []gobreaker.State{}
settings.OnStateChange = func(name string, from gobreaker.State, to gobreaker.State) {
stateChanges = append(stateChanges, to)
}
cb = gobreaker.NewCircuitBreaker(settings)
// Simulate failures to trip the circuit breaker
callExternalAPI = func() (int, error) {
return 0, errors.New("simulated failure")
}
for i := 0; i < 4; i++ {
_, err := cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err == nil {
t.Fatalf("expected error, got none")
}
}
// Check for state transitions
expectedStates := []gobreaker.State{gobreaker.StateOpen}
if len(stateChanges) != len(expectedStates) {
t.Fatalf("expected state changes %v, got %v", expectedStates, stateChanges)
}
for i, state := range expectedStates {
if stateChanges[i] != state {
t.Fatalf("expected state change to %v, got %v", state, stateChanges[i])
}
}
})
t.Run("ReadyToTrip", func(t *testing.T) {
failures := 0
settings.ReadyToTrip = func(counts gobreaker.Counts) bool {
failures = int(counts.ConsecutiveFailures)
return counts.ConsecutiveFailures > 2 // Trip after 2 failures
}
cb = gobreaker.NewCircuitBreaker(settings)
// Simulate failures
callExternalAPI = func() (int, error) {
return 0, errors.New("simulated failure")
}
for i := 0; i < 3; i++ {
_, err := cb.Execute(func() (interface{}, error) {
return callExternalAPI()
})
if err == nil {
t.Fatalf("expected error, got none")
}
}
if failures != 3 {
t.Fatalf("expected 3 consecutive failures, got %d", failures)
}
if cb.State() != gobreaker.StateOpen {
t.Fatalf("expected circuit breaker to be open, got %v", cb.State())
}
})
}