ShouldAssertions

    

A BDD library for testing C# code inspired by Jasmine, Buddy, etc.

Installation

Use NuGet or my Unity package registry.

Or install via the OpenUPM registry. (Requires openupm-cli)

openupm add games.artees.should-assertions

Usage

Use the Artees.BDD.ShouldExtensions.Should extension methods for setting invariants in your code. The assertions will be ignored unless SHOULD_ASSERTIONS is defined as a conditional compilation symbol. The following code throws a ShouldException with the message "Value should be fascinating but was glorious".

#define SHOULD_ASSERTIONS

using Artees.BDD;

public class ExampleClass
{
    public void Test()
    {
        ShouldAssertions.Listeners.Add(new ExceptionShouldListener());
        const string myCode = "glorious";
        myCode.Should().BeEqual("fascinating");
    }
}

Use the Aka method to assign a human-readable name to a variable:

myCode.Aka("My code").Should().BeEqual("fascinating");

The output will be "My code should be fascinating but was glorious".

Currently the Aka method is the only way to add a note, although it doesn't always look beautiful:

myCode.Aka("Oh no! My code").Should().BeEqual("fascinating");

Every assertion can be negated using the Not method:

myCode.Should().Not().BeEqual("fascinating");

Listeners

You can integrate ShouldAssertions with Unity's assertions, NUnit, or any other testing framework. Create your listener by inheriting from the ShouldListener class:

using Artees.BDD;
using UnityEngine;

public class UnityShouldListener : ShouldListener
{
	public override void LogError(string message)
	{
		Debug.LogAssertion(message);
	}

	public override void LogPending(string message)
	{
		Debug.LogWarning(message);
	}
}

Then add the listener to the ShouldAssertions.Listeners collection:

var listener = new UnityShouldListener();
ShouldAssertions.Listeners.Add(listener);
ShouldAssertions.Fail("Log an assertion message to the Unity's console.");

The ShouldListener is disposable. When you have finished using it, you should dispose of it:

using (var listener = new UnityShouldListener())
{
	ShouldAssertions.Listeners.Add(listener);
	false.Should().BeTrue();
}

or:

private void Start()
{
    _listener = new UnityShouldListener();
    ShouldAssertions.Listeners.Add(_listener);
}

private void OnDestroy()
{
    _listener.Dispose();
}

Drag the UnityShouldListenerInitializer.prefab into your first scene to easily add the UnityShouldListener.

Assertions

Type	Example	Description
Any	3.Should().BeEqual(3)	Verifies that two values are equal.
Any	true.Should().BeTrue()	Asserts that a condition is true.
Any	false.Should().BeFalse()	Asserts that a condition is false.
Any	((object) null).Should().BeNull()	Verifies that the object is equal to null.
Any	2.Should().BeInstanceOf<int>()	Asserts that the object is an instance of a given type.
Any	o0.Should().BeSame(o1)	Asserts that two objects refer to the same object.
double, float	3.7.Should().BeEqual(3.701, 0.1)	Verifies that two values are equal considering a delta.
double, float	(0.0 / 0.0).Should().BeNaN()	Verifies that the value is an NaN value.
string	"string".Should().Contains("str")	Asserts that the string contains a substring.
IEnumerable	new[] {1, 2, 7}.Should<int>().Contains(7)	Asserts that the collection contains an item.
IComparable	3.Should().BeGreaterThan(2)	Verifies that the value is greater.
IComparable	3.Should().BeLessThan(4)	Verifies that the value is less.
IComparable	3.Should().BeGreaterThanOrEqual(3)	Verifies that the value is greater or equal.
IComparable	3.Should().BeLessThanOrEqual(4)	Verifies that the value is less or equal.
Action	throwException.Should().Throw<Exception>()	Verifies that a delegate throws a particular exception when called.

Pending tests

You can write a pending test and come back to it later or let another developer implement it. The following code logs the warning message "Value should be fascinating but was glorious".

myCode.Should("be fascinating");