Write a test for mic support

test/cmake/Basics.cmake

@@ -316,9 +316,10 @@ add_python_test(
 
 add_python_test(
     NAME "Core accepts microphone input"
-    TEST_MODULE ""
-    DISABLED
-) # TODO: Implement this test
+    TEST_MODULE basics.core_accepts_microphone_input
+    CONTENT "${MICRECORD_NDS}"
+    CORE_OPTION melonds_boot_mode=direct
+)
 
 add_python_test(
     NAME "Core queries device power state"

test/python/basics/core_accepts_microphone_input.py

@@ -0,0 +1,49 @@
+from collections.abc import Iterator
+from itertools import count, repeat
+from math import sin
+from typing import cast
+
+from libretro import Session
+from libretro.api import ArrayAudioState
+from libretro.api.input import JoypadState
+
+import prelude
+from libretro.api.video import SoftwareVideoState
+
+
+def generate_input() -> Iterator[int]:
+    yield from repeat(None, 6)
+
+    yield JoypadState(a=True)
+
+    yield from repeat(None, 90)
+
+    yield JoypadState(a=True)
+
+    yield from repeat(None)
+
+
+def generate_sine_wave() -> Iterator[int]:
+    for i in count():
+        yield int(sin(i * 440) * 30000)
+
+
+kwargs = {
+    "input_state": generate_input,
+    "mic_interface": generate_sine_wave,
+    "options": {
+        "melonds_mic_input_active": "always"
+    }
+}
+
+session: Session
+with prelude.session(**kwargs) as session:
+    audio = cast(ArrayAudioState, session.audio)
+    video = cast(SoftwareVideoState, session.video)
+    for i in range(300):
+        session.core.run()
+
+    assert audio.buffer is not None
+    assert len(audio.buffer) > 0
+    assert any(b != 0 for b in audio.buffer)
+    # Assert that we're not just being given silence