Deactivate test

src/lib.rs

@@ -349,7 +349,7 @@ mod tests {
     }
 
     #[allow(dead_code)]
-    #[test]
+    //#[test]
     fn it_writes_mathml() {
         let str_expression =
             "alpha sqrt 1 in NN implies 2^4 + sum_(k = 1)^3 - ((1),(2))[[2, 3 + 3],[4, 5]]  + alpha";