public void CallsConstructorMultipleTimesGivenThreeParallelInstanceCalls()
{
Assert.Null(SingletonTestHelpers.GetPrivateStaticInstance <SingletonWithLocking>());
// configure logger to slow down the creation long enough to cause problems
Logger.DelayMilliseconds = 50;
var strings = new List <string>()
{
"one", "two", "three"
};
var instances = new List <SingletonWithLocking>();
var options = new ParallelOptions()
{
MaxDegreeOfParallelism = 3
};
Parallel.ForEach(strings, options, instance =>
{
instances.Add(SingletonWithLocking.Instance);
});
var log = Logger.Output();
try
{
Assert.Equal(1, log.Count(log => log.Contains("Constructor")));
Assert.Equal(3, log.Count(log => log.Contains("Instance")));
}
finally
{
Logger.Output().ToList().ForEach(h => _output.WriteLine(h));
}
}
public void ReturnsNonNullSingletonInstance()
{
Assert.Null(SingletonTestHelpers.GetPrivateStaticInstance <SingletonWithLocking>());
var result = SingletonWithLocking.Instance;
Assert.NotNull(result);
Assert.IsType <SingletonWithLocking>(result);
Logger.Output().ToList().ForEach(h => _output.WriteLine(h));
}
public void OnlyCallsConstructorOnceGivenThreeInstanceCalls()
{
Assert.Null(SingletonTestHelpers.GetPrivateStaticInstance <Singleton>());
var one = Singleton.Instance;
var two = Singleton.Instance;
var three = Singleton.Instance;
var log = Logger.Output();
Assert.Equal(1, log.Count(log => log.Contains("Constructor")));
Assert.Equal(3, log.Count(log => log.Contains("Instance")));
Logger.Output().ToList().ForEach(h => _output.WriteLine(h));
}
public void OnlyCallsConstructorOnceGivenThreeInstanceCalls()
{
Assert.Null(SingletonTestHelpers.GetPrivateStaticInstance <SingletonWithLocking>());
// configure logger to slow down the creation longer than the pauses below
Logger.DelayMilliseconds = 10;
var result1 = SingletonWithLocking.Instance;
Thread.Sleep(1);
var result2 = SingletonWithLocking.Instance;
Thread.Sleep(1);
var result3 = SingletonWithLocking.Instance;
var log = Logger.Output();
Assert.Equal(1, log.Count(log => log.Contains("Constructor")));
Assert.Equal(3, log.Count(log => log.Contains("Instance")));
Logger.Output().ToList().ForEach(h => _output.WriteLine(h));
}
public SingletonWithLockingTests(ITestOutputHelper output)
{
_output = output;
SingletonTestHelpers.Reset(typeof(SingletonWithLocking));
Logger.Clear();
}
public SingletonInstance(ITestOutputHelper output)
{
_output = output;
SingletonTestHelpers.Reset(typeof(Singleton));
Logger.Clear();
}
public NaiveImplementationTests(ITestOutputHelper output)
{
_output = output;
SingletonTestHelpers.Reset(typeof(Singleton));
Logger.Clear();
}
public DoubleNullCheckSingletonTests(ITestOutputHelper output)
{
_output = output;
SingletonTestHelpers.Reset(typeof(DoubleNullCheckSingleton));
Logger.Clear();
}
