public void CircuitBreaker_ReturnsOnOpenCircuit()
{
var circuitBreaker = new SimpleCircuitBreaker();
var cache = new CircuitBreakingFluentDictionaryCache(circuitBreaker)
.WithSource(new CacheMe());
CacheStrategy <double> cacheStrategy = cache.Method(r => r.DoWork());
Assert.IsFalse(circuitBreaker.IsBroken, "circuit should be open");
CachedValue <double> result1 = cacheStrategy.Get();
Assert.IsNotNull(result1, "because the circuit is open, we should have gotten a result");
CachedValue <double> result2 = cacheStrategy.Get();
Assert.IsNotNull(result2, "because the circuit is open, we should have gotten a result");
Assert.AreEqual(result1.Version, result2.Version, "the first and 2nd results should be the same");
}
public void CircuitBreaker_NullOnBrokenCircuit()
{
var circuitBreaker = new SimpleCircuitBreaker();
var cache = new CircuitBreakingFluentDictionaryCache(circuitBreaker)
.WithSource(new CacheMe());
CacheStrategy <double> cacheStrategy = cache.Method(r => r.DoWork());
Assert.IsFalse(circuitBreaker.IsBroken, "circuit should be open");
CachedValue <double> result1 = cacheStrategy.Get();
Assert.IsNotNull(result1, "because the circuit is open, we should have gotten a result");
circuitBreaker.TryBreak(new InvalidOperationException());
Assert.IsTrue(circuitBreaker.IsBroken, "circuit should be closed");
CachedValue <double> result2 = cacheStrategy.Get();
Assert.IsNull(result2, "because the circuit is closed, we should have gotten no result");
}
public void CircuitBreaker_NullOnBrokenCircuitDueToCachingFailure()
{
var circuitBreaker = new SimpleCircuitBreaker();
var rawCache = new CircuitBreakingFluentDictionaryCache(circuitBreaker);
var cache = rawCache.WithSource(new CacheMe());
CacheStrategy <double> cacheStrategy = cache.Method(r => r.DoWork());
Assert.IsFalse(circuitBreaker.IsBroken, "circuit should be open");
CachedValue <double> result1 = cacheStrategy.Get();
Assert.IsNotNull(result1, "because the circuit is open, we should have gotten a result");
//Simulate failure
rawCache.ShouldThrowException = true;
CachedValue <double> result2 = cacheStrategy.Get();
Assert.IsTrue(circuitBreaker.IsBroken, "circuit should now be broken");
Assert.IsNull(result2, "because the circuit is closed, we should have gotten no result");
}
