diff --git a/src/nodes/tests.rs b/src/nodes/tests.rs
index 4c3caa6..59995fe 100644
--- a/src/nodes/tests.rs
+++ b/src/nodes/tests.rs
@@ -4,6 +4,14 @@ use rug::Float;
 
 use crate::nodes::{Function, Node, Nodes, Operator, PREC};
 
+#[test]
+fn implicit_mult() {
+    assert_eq!(
+        Nodes::from_str("10 sin(10)").unwrap().evaluate().to_f64(),
+        -5.440211108893698
+    );
+}
+
 #[test]
 fn constants() {
     assert_eq!(