readme.md

Smart Assertions

Smart Test enables you to do Smart Assertions too.

Smart Assertions are assertions that do high level works with one line of code only!

For example, when you have a test for a property assignment, you can verify that PropertyChanged event is raised with 1 line of code only!

Usage

To use a Smart Assertion, you have to pass Assertion instances as params parameters of any RunTest method.

To create an Assertion instance, you should use the public static readonly property SmartAssert from the class SmartTest.

using NUnit.Framework;
using static SmartTests.SmartTest;

[TestFixture]
public class MyClassTest
{
    [Test]
    public void MyPropertyTest_IsAboveMin()
    {
        var mc = new MyClass();

        RunTest( MinExcluded.IsAboveMin &
                 NotifyPropertyChanged.HasNoSubscriber,
                 Assign( () => mc.MyProperty, 10 ),
                 SmartAssert.Raised_PropertyChanged() );

        Assert.AreEqual( 10, mc.MyProperty );
    }
}

What is a Smart Assertion

A Smart Assertion is an assertion that is able to run code before and after the Act part of your test.

For example, in the previous example, Raised_PropertyChanged creates an instance of an Assertion sub-class that:

1. Before Act: register itself on the PropertyChanged event of mc.
2. During Act: the event should be triggered and the previous method should be called:
   1. Setting a flag that the event was raised
   2. Verifying that the PropertyName of the event is MyProperty.
3. After Act: ensure that the flag is true, otherwise generates an exception.

Existing Smart Assertions

Here is the existing categories of Smart Assertions:

• Change: to test relative changes to properties
• ChangedTo: to test an effective change to a property.
• NotChangedL to test properties did not change.
• PropertyChanged: to test PropertyChanged event.
• Raise: to test any classical event.
• Wait: to test parallel code.
• Within: to test code is done within specific time.

Adding Smart Assertions

If you want more Smart Assertions, you can create your own.