From 77daf85fc1855b32728b243b4d71d95a3a7b930e Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Wed, 26 Jul 2023 19:31:43 +0200
Subject: [PATCH] Add unit test for angles unwind math #1267

---
 Source/Engine/Tests/TestMath.cs | 47 +++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Source/Engine/Tests/TestMath.cs

diff --git a/Source/Engine/Tests/TestMath.cs b/Source/Engine/Tests/TestMath.cs
new file mode 100644
index 000000000..bc1bc1a8d
--- /dev/null
+++ b/Source/Engine/Tests/TestMath.cs
@@ -0,0 +1,47 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#if FLAX_TESTS
+using NUnit.Framework;
+
+namespace FlaxEngine.Tests
+{
+    /// <summary>
+    /// Tests for <see cref="Mathf"/> and <see cref="Mathd"/>.
+    /// </summary>
+    [TestFixture]
+    public class TestMath
+    {
+        /// <summary>
+        /// Test unwinding angles.
+        /// </summary>
+        [Test]
+        public void TestUnwind()
+        {
+            Assert.AreEqual(0.0f, Mathf.UnwindDegreesAccurate(0.0f));
+            Assert.AreEqual(45.0f, Mathf.UnwindDegreesAccurate(45.0f));
+            Assert.AreEqual(90.0f, Mathf.UnwindDegreesAccurate(90.0f));
+            Assert.AreEqual(180.0f, Mathf.UnwindDegreesAccurate(180.0f));
+            Assert.AreEqual(0.0f, Mathf.UnwindDegreesAccurate(360.0f));
+            Assert.AreEqual(0.0f, Mathf.UnwindDegrees(0.0f));
+            Assert.AreEqual(45.0f, Mathf.UnwindDegrees(45.0f));
+            Assert.AreEqual(90.0f, Mathf.UnwindDegrees(90.0f));
+            Assert.AreEqual(180.0f, Mathf.UnwindDegrees(180.0f));
+            Assert.AreEqual(0.0f, Mathf.UnwindDegrees(360.0f));
+            var fError = 0.001f;
+            var dError = 0.00001;
+            for (float f = -400.0f; f <= 400.0f; f += 0.1f)
+            {
+                var f1 = Mathf.UnwindDegreesAccurate(f);
+                var f2 = Mathf.UnwindDegrees(f);
+                if (Mathf.Abs(f1 - f2) >= fError)
+                    throw new Exception($"Failed on angle={f}, {f1} != {f2}");
+                var d = (double)f;
+                var d1 = Mathd.UnwindDegreesAccurate(d);
+                var d2 = Mathd.UnwindDegrees(d);
+                if (Mathd.Abs(d1 - d2) >= dError)
+                    throw new Exception($"Failed on angle={d}, {d1} != {d2}");
+            }
+        }
+    }
+}
+#endif