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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));
+    }
+}
+```
+