Delayed NUnit Assert message evaluation

Question

I have this assert in my test code

Assert.That(() => eventData.Count == 0,
Is.True.After(notificationPollingDelay),
\"Received unexpected event with last even         


        

Answer 1

In NUnit version 3.50 I had to use a different syntax. Here is the example:

var constraint = Is.True.After( delayInMilliseconds: 100000, pollingInterval: 100);
Assert.That( () => yourCondition, constraint );

This will test whether yourCondition is true waiting a certain maximum time using the DelayedConstraint created by the Is.True.After method.

In this example the DelayedConstraint is configured to use maximum time of 100 seconds polling every 0.1 seconds.

See aslo the legacy NUnit 2.5 documentation for DelayedConstraint.