diff --git a/fixed_wide_vectors/src/tests/tests.rs b/fixed_wide_vectors/src/tests/tests.rs
index ed0d8d8..a3530ea 100644
--- a/fixed_wide_vectors/src/tests/tests.rs
+++ b/fixed_wide_vectors/src/tests/tests.rs
@@ -1,4 +1,4 @@
-use crate::types::Vector3;
+use crate::types::{Vector3,Matrix3x4,Matrix4x2,Matrix3x2};
 
 #[test]
 fn test_bool(){
@@ -7,3 +7,36 @@ fn test_bool(){
 	assert_eq!(Vector3::new([false,false,true]).all(),false);
 	assert_eq!(Vector3::new([true,true,true]).all(),true);
 }
+
+#[test]
+fn test_arithmetic(){
+	let a=Vector3::new([1,2,3]);
+	assert_eq!((a+a*2).array,Vector3::new([1*3,2*3,3*3]).array);
+}
+
+#[test]
+fn matrix_dot(){
+	let lhs=Matrix3x4::new([
+		[1.0,2.0,3.0,4.0],
+		[5.0,6.0,7.0,8.0],
+		[9.0,1.0,1.0,1.0],
+	]);
+	let rhs=Matrix4x2::new([
+		[1.0,2.0],
+		[3.0,4.0],
+		[5.0,6.0],
+		[7.0,8.0],
+	]);
+	// Mat3<Vec4>.dot(Mat4<Vec2>) -> Mat3<Vec2>
+	let m_dot=lhs.dot(rhs);
+	//In[1]:= {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}} . {{1, 2}, {3, 4}, {5, 6}, {7, 8}}
+	//Out[1]= {{50, 60}, {114, 140}, {178, 220}}
+	assert_eq!(
+		m_dot.array,
+		Matrix3x2::new([
+			[50.0,60.0],
+			[114.0,140.0],
+			[178.0,220.0],
+		]).array
+	);
+}