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# 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](http://todo) 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));
}
}
```
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