# Vector4EqualityComparer Use this class to compare two [Vector4](https://docs.unity3d.com/ScriptReference/Vector4.html) objects for equality with [NUnit](http://www.nunit.org/) constraints. Call `Vector4EqualityComparer.Instance` to perform comparisons using default calculation error value 0.0001f. To set a custom test value, instantiate a new comparer using the [one argument constructor](#constructor). ## Static Properties | Syntax | Description | | ---------------------------------- | ------------------------------------------------------------ | | `Vector4EqualityComparer Instance` | A comparer instance with the default calculation error value set to 0.0001f. | ## Constructors | Syntax | Description | | --------------------------------------------- | ---------------------------------------------- | | `Vector4EqualityComparer(float allowedError)` | Creates an instance with a custom error value. | ## Public methods | Syntax | Description | | ------------------------------------------------ | ------------------------------------------------------------ | | `bool Equals(Vector4 expected, Vector4 actual);` | Compares the `actual` and `expected` `Vector4` objects for equality using [Utils.AreFloatsEqual](xref:UnityEngine.TestTools.Utils.Utils.AreFloatsEqual*) to compare the `x`, `y`, `z`, and `w` attributes of `Vector4`. | ## Example ```c# [TestFixture] public class Vector4Test { [Test] public void VerifyThat_TwoVector4ObjectsAreEqual() { // 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)); } } ```