diff --git a/tests/node_code.rs b/tests/node_code.rs
index 0e699fb..b5f1c83 100644
--- a/tests/node_code.rs
+++ b/tests/node_code.rs
@@ -39,3 +39,53 @@ fn check_node_code_1() {
     assert_decimated_feq!(res.0, 50, vec![0.3; 10]);
 }
 
+#[test]
+fn check_node_code_state() {
+    let (mut matrix, mut node_exec) = setup();
+
+    let block_fun = matrix.get_block_function(0).expect("block fun exists");
+    {
+        let mut block_fun = block_fun.lock().expect("matrix lock");
+        block_fun.instanciate_at(0, 0, 2, "value", Some("220.0".to_string()));
+        block_fun.instanciate_at(0, 1, 2, "phase", None);
+        block_fun.instanciate_at(0, 1, 3, "value", Some("2.0".to_string()));
+        block_fun.instanciate_at(0, 2, 2, "*", None);
+        block_fun.instanciate_at(0, 3, 1, "-", None);
+        block_fun.instanciate_at(0, 2, 1, "value", Some("1.0".to_string()));
+        block_fun.instanciate_at(0, 4, 1, "set", Some("&sig1".to_string()));
+    }
+
+    matrix.check_block_function(0).expect("no compile error");
+
+    let fft = run_and_get_fft4096_now(&mut node_exec, 50);
+    // Aliasing sawtooth I expect:
+    assert_eq!(
+        fft,
+        vec![
+            (205, 133),
+            (215, 576),
+            (226, 527),
+            (237, 90),
+            (431, 195),
+            (441, 322),
+            (452, 131),
+            (646, 61),
+            (657, 204),
+            (668, 157),
+            (872, 113),
+            (883, 155),
+            (894, 51),
+            (1098, 127),
+            (1109, 82),
+            (1314, 85),
+            (1324, 98),
+            (1540, 93),
+            (1755, 70),
+            (1766, 67),
+            (1981, 72),
+            (2196, 60),
+            (2422, 57),
+            (2638, 52)
+        ]
+    );
+}