Feat: begin slight refactoring

tests/forth/midi.rs

@@ -1,6 +1,10 @@
 use crate::harness::{default_ctx, expect_outputs, forth};
-use cagire::forth::{CcMemory, StepContext};
-use std::sync::{Arc, Mutex};
+use cagire::forth::{CcAccess, StepContext};
+use cagire::midi::CcMemory;
+use std::sync::Arc;
+
+#[allow(unused_imports)]
+use cagire::forth::Value;
 
 #[test]
 fn test_midi_channel_set() {
@@ -42,16 +46,13 @@ fn test_ccval_returns_zero_without_cc_memory() {
 
 #[test]
 fn test_ccval_reads_from_cc_memory() {
-    let cc_memory: CcMemory = Arc::new(Mutex::new([[[0u8; 128]; 16]; 4]));
-    {
-        let mut mem = cc_memory.lock().unwrap();
-        mem[0][0][1] = 64; // device 0, channel 1 (0-indexed), CC 1, value 64
-        mem[0][5][74] = 127; // device 0, channel 6 (0-indexed), CC 74, value 127
-    }
+    let cc_memory = CcMemory::new();
+    cc_memory.set_cc(0, 0, 1, 64); // device 0, channel 1 (0-indexed), CC 1, value 64
+    cc_memory.set_cc(0, 5, 74, 127); // device 0, channel 6 (0-indexed), CC 74, value 127
 
     let f = forth();
     let ctx = StepContext {
-        cc_memory: Some(Arc::clone(&cc_memory)),
+        cc_access: Some(Arc::new(cc_memory.clone()) as Arc<dyn CcAccess>),
         ..default_ctx()
     };
 
@@ -122,7 +123,10 @@ fn test_midi_full_defaults() {
 fn test_midi_bend_center() {
     let outputs = expect_outputs("0.0 bend m.", 1);
     // 0.0 -> 8192 (center)
-    assert!(outputs[0].contains("/midi/bend/8191/chan/0") || outputs[0].contains("/midi/bend/8192/chan/0"));
+    assert!(
+        outputs[0].contains("/midi/bend/8191/chan/0")
+            || outputs[0].contains("/midi/bend/8192/chan/0")
+    );
 }
 
 #[test]