Added test for the Comb node

tests/common/mod.rs

@@ -531,6 +531,33 @@ pub fn run_and_get_fft4096_now(
     fft_thres_at_ms(&mut out_l[..], FFT::F4096, thres, 0.0)
 }
 
+/// Takes about 1 second of audio to average 10 ffts
+#[allow(unused)]
+pub fn run_and_get_avg_fft4096_now(
+    node_exec: &mut hexodsp::nodes::NodeExecutor,
+    thres: u32) -> Vec<(u16, u32)>
+{
+    let min_samples_for_fft = 4096.0 * 1.5; // 1.5 for some extra margin
+    let run_len_s = min_samples_for_fft / SAMPLE_RATE;
+
+    let (mut out_l, _out_r) = run_no_input(node_exec, run_len_s);
+    let mut data = fft_thres_at_ms(&mut out_l[..], FFT::F4096, 0, 0.0);
+
+    for _ in 0..9 {
+        let (mut out_l, _out_r) = run_no_input(node_exec, run_len_s);
+        let out = fft_thres_at_ms(&mut out_l[..], FFT::F4096, 0, 0.0);
+        for (x, d) in out.iter().zip(data.iter_mut()) {
+            d.1 += x.1;
+        }
+    }
+
+    for d in data.iter_mut() {
+        d.1 /= 10;
+    }
+
+    data.iter().filter(|d| d.1 >= thres).copied().collect()
+}
+
 #[allow(unused)]
 pub enum FFT {
     F16,

tests/node_comb.rs

@@ -0,0 +1,50 @@
+mod common;
+use common::*;
+
+#[test]
+fn check_node_comb_1() {
+    let (node_conf, mut node_exec) = new_node_engine();
+    let mut matrix = Matrix::new(node_conf, 3, 3);
+
+    let noise_1 = NodeId::Noise(0);
+    let comb_1  = NodeId::Comb(0);
+    let out_1   = NodeId::Out(0);
+    matrix.place(0, 1,
+        Cell::empty(noise_1)
+        .input(None, None, None)
+        .out(None, noise_1.out("sig"), None));
+    matrix.place(1, 1,
+        Cell::empty(comb_1)
+        .input(None, comb_1.inp("inp"), None)
+        .out(None, comb_1.out("sig"), None));
+    matrix.place(2, 2,
+        Cell::empty(out_1)
+        .input(None, out_1.inp("ch1"), out_1.inp("ch1"))
+        .out(None, None, None));
+
+    pset_n(&mut matrix, comb_1, "g", 0.950);
+    pset_n(&mut matrix, comb_1, "time", 0.014);
+    matrix.sync().unwrap();
+
+    let fft = run_and_get_avg_fft4096_now(&mut node_exec, 180);
+    assert_eq!(fft, vec![
+        (0, 216), (11, 221), (22, 216), (3370, 206), (3381, 248),
+        (3391, 191), (6740, 185), (6751, 207), (6761, 195), (10131, 215),
+        (10142, 210), (10153, 213), (10164, 201), (20338, 187), (20349, 184)
+    ]);
+
+    pset_n_wait(&mut matrix, &mut node_exec, comb_1, "time", 0.030);
+
+    let fft = run_and_get_avg_fft4096_now(&mut node_exec, 180);
+    assert_eq!(fft, vec![
+        (1001, 206), (2993, 196), (3004, 219), (3994, 197),
+        (6998, 211), (8000, 201)
+    ]);
+
+    pset_n_wait(&mut matrix, &mut node_exec, comb_1, "g", 0.999);
+    let fft = run_and_get_avg_fft4096_now(&mut node_exec, 1000);
+    assert_eq!(fft, vec![
+        (0, 2003), (11, 1015), (991, 1078), (1001, 1837), (2003, 1059),
+        (2993, 1420), (3004, 1775), (3994, 1297), (4005, 1485)
+    ]);
+}