wrote test for matix multiplication

matrix/Cargo.toml

@@ -8,4 +8,3 @@ edition = "2018"
 
 [dependencies]
 approx = "0.4"
-bencher = "0.1.5"

matrix/src/lib.rs

@@ -169,4 +169,29 @@ mod tests {
 
         assert_ne!(m_a, m_b);
     }
+
+    #[test]
+    fn multiply() {
+        let matrix_a = Matrix::from_array([
+            [1.0, 2.0, 3.0, 4.0,],
+            [5.0, 6.0, 7.0, 8.0,],
+            [9.0, 8.0, 7.0, 6.0,],
+            [5.0, 4.0, 3.0, 2.0,],
+        ]);
+        let matrix_b = Matrix::from_array([
+            [-2.0, 1.0, 2.0, 3.0,],
+            [3.0, 2.0, 1.0, -1.0,],
+            [4.0, 3.0, 6.0, 5.0,],
+            [1.0, 2.0, 7.0, 8.0,],
+        ]);
+
+        let expected = Matrix::from_array([
+            [20.0, 22.0, 50.0, 48.0],
+            [44.0, 54.0, 114.0, 108.0],
+            [40.0, 58.0, 110.0, 102.0,],
+            [16.0, 26.0, 46.0, 42.0],
+        ]);
+
+        assert_eq!(matrix_a * matrix_b, expected);
+    }
 }