Multiple Tests give different result than single test

Try using MockManager.Verify() or MockManager.ClearAll() in the test teardown method.
In any case, if you could post the code, we can help find out why the mocks where not cleared.

[TestFixture]
public class ServiceStartupManagerTests
{
[Test, Category("TypeMock"), ClearMocks, VerifyMocks]
public void TestStartServices()
{
ServiceStartupOrder ds = new ServiceStartupOrder();
ds.ServiceList.AddServiceListRow("Test0", 0, 0); //ignore
ds.ServiceList.AddServiceListRow("Test1", 1, 2);
ds.ServiceList.AddServiceListRow("Test2", 2, 1);

//Setup the test
using (RecordExpectations recorder = RecorderManager.StartRecording())
{
// CAUTION: ALL calls here are mocked!!!
ServiceManagerHelper helper = new ServiceManagerHelper();
StartupValidator val = new StartupValidator();

recorder.ExpectAndReturn(helper.StartService("Test1"), true);
recorder.ExpectAndReturn(helper.StartService("Test2"), true);
//recorder.ExpectAndReturn(val.ReadyForStartup(Guid.Empty),true);
recorder.CheckArguments();
}

ServiceStartupManager mgr = new ServiceStartupManager();
mgr.StartServices(ds);

MockManager.Verify();
MockManager.ClearAll();
}

[Test, Category("TypeMock"), ClearMocks, VerifyMocks]
//Test fails right now, we need to figure out how to clear the recorder between each test
public void TestStartServices_NotReady()
{
ServiceStartupOrder ds = new ServiceStartupOrder();
ds.ServiceList.AddServiceListRow("Test0", 0, 0); //ignore
ds.ServiceList.AddServiceListRow("Test1", 1, 2);
ds.ServiceList.AddServiceListRow("Test2", 2, 1);

//Setup the test
using (RecordExpectations recorder = RecorderManager.StartRecording())
{
// CAUTION: ALL calls here are mocked!!!
ServiceManagerHelper helper = new ServiceManagerHelper();
StartupValidator val = new StartupValidator();

recorder.ExpectAndReturn(val.ReadyForStartup(Guid.Empty), false);
recorder.CheckArguments();
}

ServiceStartupManager mgr = new ServiceStartupManager();
mgr.StartServices(ds);

MockManager.Verify();
MockManager.ClearAll();
}
[Test, Category("TypeMock"), ClearMocks, VerifyMocks]
public void TestStopServices()
{
ServiceStartupOrder ds = new ServiceStartupOrder();
ds.ServiceList.AddServiceListRow("Test0", 0, 0); //ignore
ds.ServiceList.AddServiceListRow("Test1", 1, 2);
ds.ServiceList.AddServiceListRow("Test2", 2, 1);

//Setup the test
using (RecordExpectations recorder = RecorderManager.StartRecording())
{
// CAUTION: ALL calls here are mocked!!!
ServiceManagerHelper helper = new ServiceManagerHelper();

recorder.ExpectAndReturn(helper.StopService("Test2"), true);
recorder.ExpectAndReturn(helper.StopService("Test1"), true);
recorder.CheckArguments();

}

ServiceStartupManager mgr = new ServiceStartupManager();
mgr.StopServices(ds);

MockManager.ClearAll();
MockManager.Verify();

}
}

the test TestStartServices_NotReady fails. This is because the call recorder.ExpectAndReturn(val.ReadyForStartup(Guid.Empty), false) did not really return false, it returned true. I guess this is because of the prev test. I tried clearMock, same thing.

Thanks for the fast response

Hi,
You should use the Tracer.
I don't really know your code but the Validator should not be effected from other tests as there is a new in the recorder. This means that a new instance will be created in the production code and that will be mocked.
Perhaps the code doesn't create a new Validator or creates it only the first time.

Scott,
thank you very much. Yes the validator was created only once (Singleton). After changing that it worked fine.

How would I write a test if it is a singleton? I cannot tell when the new is called. How would you tell this the recorder?

You can use:

recorder.MockAllInstances = true; 

This will mock new and old instances.