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# QuaternionEqualityComparer
Use this utility to compare two [Quaternion](https://docs.unity3d.com/ScriptReference/Quaternion.html) objects for equality with [NUnit](http://www.nunit.org/) assertion constraints. Use the static instance `QuaternionEqualityComparer.Instance` to have the default calculation error value set to 0.00001f. For any other custom error value, use the [one argument constructor](#constructors).
## Static properties
| Syntax | Description |
| ---------- | ---------------------------------------------------------- |
| `Instance` | A comparer instance with the default error value 0.00001f. |
## Constructors
| Syntax | Description |
| ------------------------------------------------ | ------------------------------------------------------------ |
| `QuaternionEqualityComparer(float allowedError)` | Creates an instance of the comparer with a custom allowed error value. |
## Public methods
| Syntax | Description |
| ----------------------------------------------------- | ------------------------------------------------------------ |
| `bool Equals(Quaternion expected, Quaternion actual)` | Compares the `actual` and `expected` `Quaternion` objects for equality using the [Quaternion.Dot](https://docs.unity3d.com/ScriptReference/Quaternion.Dot.html) method. |
## Example
```c#
[TestFixture]
public class QuaternionTest
{
[Test]
public void VerifyThat_TwoQuaternionsAreEqual()
{
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));
//Using default error 0.00001f
actual = new Quaternion(10f, 0f, 0.1f, 0f);
expected = new Quaternion(1f, 10f, 0.1f, 0f);
Assert.That(actual, Is.EqualTo(expected).Using(QuaternionEqualityComparer.Instance));
}
}
```
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