From 3d2d763a3b6aeb065c1e47b0bc8ccd27c4f5a328 Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Tue, 29 Jun 2021 20:56:08 -0700
Subject: [PATCH] test 4x4 multiplication

---
 rtchallenge/src/matrices.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/rtchallenge/src/matrices.rs b/rtchallenge/src/matrices.rs
index cde3253..dd66764 100644
--- a/rtchallenge/src/matrices.rs
+++ b/rtchallenge/src/matrices.rs
@@ -339,4 +339,28 @@ mod tests {
         );
         assert_ne!(a, b);
     }
+    #[test]
+    fn mul4x4() {
+        let a = Matrix4x4::new(
+            [1., 2., 3., 4.],
+            [5., 6., 7., 8.],
+            [9., 8., 7., 6.],
+            [5., 4., 3., 2.],
+        );
+        let b = Matrix4x4::new(
+            [-2., 1., 2., 3.],
+            [3., 2., 1., -1.],
+            [4., 3., 6., 5.],
+            [1., 2., 7., 8.],
+        );
+        assert_eq!(
+            a * b,
+            Matrix4x4::new(
+                [20., 22., 50., 48.],
+                [44., 54., 114., 108.],
+                [40., 58., 110., 102.],
+                [16., 26., 46., 42.],
+            )
+        );
+    }
 }