Initial MIDI Rx test using pyxsim

tests/midi_test_helpers.py

@@ -1,7 +1,7 @@
 # Copyright 2024 XMOS LIMITED.
 # This Software is subject to the terms of the XMOS Public Licence: Version 1.
 
-class Midi_expect:
+class midi_expect_tx:
     def __init(self):
         pass
 
@@ -14,11 +14,33 @@ class Midi_expect:
 
         return expected
 
+class midi_expect_rx:
+    def __init(self):
+        pass
 
-def create_midi_tx_file(commands):
-    with open("midi_tx_cmds.txt", "wt") as mt:
+    def expect(self, commands):
+        expected = ""
+        for command in commands:
+            while len(command) < 3:
+                command.append(0)
+            expected += "dut_midi_rx: " + " ".join([f"{byte}" for byte in command]) + "\n"
+
+        return expected
+
+midi_tx_file = "midi_tx_cmds.txt"
+midi_rx_file = "midi_rx_cmds.txt"
+
+def create_midi_tx_file(commands=None):
+    with open(midi_tx_file, "wt") as mt:
+        if commands is None:
+            return
         for command in commands:
             while len(command) < 3:
                 command.append(0)
             text = " ".join([str(byte) for byte in command]) + "\n"
             mt.write(text)
+
+def create_midi_rx_file(num_commands=0):
+    with open(midi_rx_file, "wt") as mr:
+        text = f"{num_commands}\n"
+        mr.write(text)