From 105ff81713d541f1020f109589fd1310c9d9cf63 Mon Sep 17 00:00:00 2001
From: Oliver Booth <me@olivr.me>
Date: Mon, 3 Apr 2023 15:02:03 +0100
Subject: [PATCH] test: add tests for MathUtility.Lerp

---
 X10D.Tests/src/Math/MathUtilityTests.cs | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/X10D.Tests/src/Math/MathUtilityTests.cs b/X10D.Tests/src/Math/MathUtilityTests.cs
index 4056a54..cd23081 100644
--- a/X10D.Tests/src/Math/MathUtilityTests.cs
+++ b/X10D.Tests/src/Math/MathUtilityTests.cs
@@ -1,4 +1,4 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 #if !NET6_0_OR_GREATER
 using X10D.Core;
 #endif
@@ -96,6 +96,27 @@ public class MathUtilityTests
         Assert.AreEqual(0.0f, floatResult, 1e-6f);
     }
 
+    [TestMethod]
+    public void Lerp_ShouldReturnHigher_GivenAlpha1()
+    {
+        Assert.AreEqual(20.0f, MathUtility.Lerp(10.0f, 20.0f, 1.0f));
+        Assert.AreEqual(20.0, MathUtility.Lerp(10.0, 20.0, 1.0));
+    }
+
+    [TestMethod]
+    public void Lerp_ShouldReturnLower_GivenAlpha0()
+    {
+        Assert.AreEqual(10.0f, MathUtility.Lerp(10.0f, 20.0f, 0.0f));
+        Assert.AreEqual(10.0, MathUtility.Lerp(10.0, 20.0, 0.0));
+    }
+
+    [TestMethod]
+    public void Lerp_ShouldReturnMidPoint_GivenAlphaPoint5()
+    {
+        Assert.AreEqual(15.0f, MathUtility.Lerp(10.0f, 20.0f, 0.5f));
+        Assert.AreEqual(15.0, MathUtility.Lerp(10.0, 20.0, 0.5));
+    }
+
     [TestMethod]
     public void LinearToGamma_ShouldReturnQuarter_GivenQuarterAndGamma1()
     {