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package llm
import (
"testing"
"time"
)
func TestCircuitBreaker_NilIsNoOp(t *testing.T) {
var cb *circuitBreaker
if !cb.Allow() {
t.Fatal("nil breaker must allow")
}
// These must not panic on a nil receiver.
cb.recordFailure()
cb.recordSuccess()
}
func TestCircuitBreaker_TripsAfterThreshold(t *testing.T) {
cb := newCircuitBreaker(3, time.Minute)
for i := 0; i < 2; i++ {
cb.recordFailure()
if !cb.Allow() {
t.Fatalf("breaker should stay closed before threshold (i=%d)", i)
}
}
cb.recordFailure() // third failure trips it
if cb.Allow() {
t.Fatal("breaker should be open after threshold failures")
}
}
func TestCircuitBreaker_SuccessResets(t *testing.T) {
cb := newCircuitBreaker(2, time.Minute)
cb.recordFailure()
cb.recordSuccess()
cb.recordFailure() // only one failure since reset; should not trip
if !cb.Allow() {
t.Fatal("breaker should remain closed after success reset")
}
}
func TestCircuitBreaker_HalfOpenAllowsSingleProbe(t *testing.T) {
now := time.Unix(0, 0)
cb := newCircuitBreaker(1, 10*time.Second)
cb.now = func() time.Time { return now }
cb.recordFailure() // trips (threshold 1)
if cb.Allow() {
t.Fatal("should be open immediately after trip")
}
// Advance past cooldown: first Allow transitions to half-open and permits one probe.
now = now.Add(11 * time.Second)
if !cb.Allow() {
t.Fatal("expected half-open probe to be allowed")
}
// A second concurrent probe is rejected.
if cb.Allow() {
t.Fatal("second probe must be rejected while half-open")
}
}
func TestCircuitBreaker_HalfOpenProbeSuccessCloses(t *testing.T) {
now := time.Unix(0, 0)
cb := newCircuitBreaker(1, time.Second)
cb.now = func() time.Time { return now }
cb.recordFailure()
now = now.Add(2 * time.Second)
if !cb.Allow() {
t.Fatal("expected probe allowed")
}
cb.recordSuccess()
if !cb.Allow() {
t.Fatal("breaker should be closed after successful probe")
}
}
func TestCircuitBreaker_HalfOpenProbeFailureReopens(t *testing.T) {
now := time.Unix(0, 0)
cb := newCircuitBreaker(1, time.Second)
cb.now = func() time.Time { return now }
cb.recordFailure()
now = now.Add(2 * time.Second)
if !cb.Allow() {
t.Fatal("expected probe allowed")
}
cb.recordFailure() // probe failed: reopen
if cb.Allow() {
t.Fatal("breaker should reopen after failed probe")
}
}
func TestCircuitBreaker_ZeroThresholdNeverTrips(t *testing.T) {
cb := newCircuitBreaker(0, time.Minute)
for i := 0; i < 100; i++ {
cb.recordFailure()
}
if !cb.Allow() {
t.Fatal("threshold<=0 should never trip the breaker")
}
}
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