The Unity Test Runner contains utilities that can be used with NUnit constraints for comparing floating point values and some non-primitive objects like Vector2, Vector4 and so on. These classes are placed in the UnityEngine.TestTools.Utils namespace.
A class that contains utility functions.
Signature public static bool AreFloatsEqual(float expected, float actual, float allowedRelativeError)
Description This method does a relative epsilon comparison of two floating point numbers for equality, and takes the relative error as the third parameter. The relative error is the absolute error divided by the magnitude of the exact value.
Usage
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class UtilTests
{
[Test]
public void FloatsAreEqual()
{
float expected = 10e-8f;
float actual = 0f;
float allowedRelativeError = 10e-6f;
Assert.That(Utils.AreFloatsEqual(expected, actual, allowedRelativeError), Is.True);
}
}
Signature public static bool AreFloatsEqualAbsoluteError(float expected, float actual, float allowedAbsoluteError)
Description This method compares two floating point numbers for equality under the given tolerance.
Usage
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class UtilTests
{
[Test]
public void FloatsAreAbsoluteEqual()
{
float expected = 0f;
float actual = 10e-6f;
float error = 10e-5f;
Assert.That(Utils.AreFloatsEqualAbsoluteError(expected, actual, error), Is.True);
}
}
Signature public static GameObject CreatePrimitive(PrimitiveType type)
Description
This is analogous to GameObject.CreatePrimitive, but creates a primitive mesh renderer with a fast shader instead of the default built-in shader, optimized for testing performance. It returns a GameObject with primitive mesh renderer and collider.
Usage
var box = Utils.CreatePrimitive(PrimitiveType.Cube);
This implements System.Collections.Generic.IEqualityComparer<float>. This comparer can be used with NUnit constraints to compare two float values for equality using relative epsilon comparison. Internally, this comparer uses Utils.AreFloatsEqual to compare float values.
Usage
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class FloatsTest
{
[Test]
public void FloatsAreEqual()
{
var comparer = new FloatEqualityComparer(10e-6f);
var actual = -0.00009f;
var expected = 0.00009f
Assert.That(actual, Is.EqualTo(expected).Using(comparer));
//Default allowed relative error 0.0001f
var actual = -0.01f;
var expected = 0.001f
Assert.That(actual, Is.EqualTo(expected).Using(FloatEqualityComparer.Instance));
}
}
Use this class to compare two UnityEngine.Color objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Color> interface. It considers 0.01f as the default error for comparisons if a value is not provided in the ColorEqualityComparer constructor.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class ColorTest
{
[Test]
public void ColorsAreEqual()
{
//Allowed error 10e-5f
var comparer = new ColorEqualityComparer(10e-5f);
var firstColor = new Color(0f, 0f, 0f, 1f);
var secondColor = new Color(10e-6f, 0f, 0f, 1f);
Assert.That(firstColor, Is.EqualTo(secondColor).Using(comparer));
//Using default error
firstColor = new Color(0f, 0f, 0f, 0f);
secondColor = new Color(0f, 0f, 0f, 0f);
Assert.That(firstColor, Is.EqualTo(secondColor).Using(ColorEqualityComparer.Instance));
}
}
Use this class to compare two UnityEngine.Quaternion objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Quaternion> interface. Use the static instance Instance to compare with default error 0.00001f. For any custom error value, use the single argument constructor.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class QuaternionTest
{
[Test]
public void QuaternionsAreEqual()
{
var actual = new Quaternion(10f, 0f, 0f, 0f);
var expected = new Quaternion(1f, 10f, 0f, 0f);
var comparer = new QuaternionEqualityComparer(10e-6f);
Assert.That(actual, Is.EqualTo(expected).Using(comparer));
}
}
Use this class to compare two UnityEngine.Vector2 objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Vector2> interface. Use the static Instance member to compare using default error 0.0001f. You can supply a custom error value while constructing the comparer object. It uses a relative epsilon comparison (the absolute error divided by the magnitude of the exact value) of Utils.AreFloatsEqual to compare individual coordinates.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class Vector2Test
{
[Test]
public void Vector2AreEqual()
{
//Custom error
var actual = new Vector2(10e-7f, 10e-7f);
var expected = new Vector2(0f, 0f);
var comparer = new Vector2EqualityComparer(10e-6f);
Assert.That(actual, Is.EqualTo(expected).Using(comparer));
//Default error 0.0001f
actual = new Vector2(0.01f, 0.01f);
expected = new Vector2(0.01f, 0.01f);
Assert.That(actual, Is.EqualTo(expected).Using(Vector2EqualityComparer.Instance));
}
}
Use this class to compare two UnityEngine.Vector3 objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Vector3> interface. Use the static Instance member to compare using default error 0.0001f. You can supply a custom error value while constructing the comparer object. It uses a relative epsilon comparison (the absolute error divided by the magnitude of the exact value) of Utils.AreFloatsEqual to compare individual coordinates.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class Vector3Test
{
[Test]
public void Vector3AreEqual()
{
//Custom error 10e-6f
var actual = new Vector3(10e-8f, 10e-8f, 10e-8f);
var expected = new Vector3(0f, 0f, 0f);
var comparer = new Vector3EqualityComparer(10e-6f);
Assert.That(actual, Is.EqualTo(expected).Using(comparer));
//Default error 0.0001f
actual = new Vector3(0.01f, 0.01f, 0f);
expected = new Vector3(0.01f, 0.01f, 0f);
Assert.That(actual, Is.EqualTo(expected).Using(Vector3EqualityComparer.Instance));
}
}
Use this class to compare two UnityEngine.Vector4 objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Vector4> interface. Use the static Instance member to compare using default error 0.0001f. You can supply a custom error value while constructing the comparer object. It uses a relative epsilon comparison (the absolute error divided by the magnitude of the exact value) of Utils.AreFloatsEqual to compare individual coordinates.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class Vector4Test
{
[Test]
public void Vector4AreEqual()
{
//Custom error 10e-6f
var actual = new Vector4(0, 0, 1e-6f, 1e-6f);
var expected = new Vector4(1e-6f, 0f, 0f, 0f);
var comparer = new Vector4EqualityComparer(10e-6f);
Assert.That(actual, Is.EqualTo(expected).Using(comparer));
//Default error 0.0001f
actual = new Vector4(0.01f, 0.01f, 0f, 0f);
expected = new Vector4(0.01f, 0.01f, 0f, 0f);
Assert.That(actual, Is.EqualTo(expected).Using(Vector4EqualityComparer.Instance));
}
}
Use this class to compare two UnityEngine.Vector2 objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Vector2> interface. It uses the overload operator== of UnityEngine.Vector2 to compare two Vector2 objects.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class Vector2Test
{
[Test]
public void VectorsAreEqual()
{
var actual = new Vector2(10e-7f, 10e-7f);
var expected = new Vector2(0f, 0f);
Assert.That(actual, Is.EqualTo(expected).Using(Vector2ComparerWithEqualsOperator.Instance));
}
}
Use this class to compare two UnityEngine.Vector3 objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Vector3> interface. It uses the overload operator== of UnityEngine.Vector3 to compare two Vector3 objects.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class Vector3Test
{
[Test]
public void VectorsAreEqual()
{
var actual = new Vector3(10e-7f, 10e-7f, 10e-7f);
var expected = new Vector2(0f, 0f, 0f);
Assert.That(actual, Is.EqualTo(expected).Using(Vector3ComparerWithEqualsOperator.Instance));
}
}
Use this class to compare two UnityEngine.Vector4 objects for equality, with NUnit constraints. This class implements the System.Collections.Generic.IEqualityComparer<Vector4> interface. It uses the overload operator== of UnityEngine.Vector4 to compare two Vector4 objects.
Usage
using UnityEngine;
using NUnit.Framework;
using UnityEngine.TestTools.Utils;
[TestFixture]
public class Vector4Test
{
[Test]
public void Vector4AreEqual()
{
var actual = new Vector4(0, 0, 1e-6f, 1e-6f);
var expected = new Vector4(1e-6f, 0f, 0f, 0f);
Assert.That(actual, Is.EqualTo(expected).Using(Vector4ComparerWithEqualsOperator.Instance));
}
}