test: spawn fake mpv and parec helpers with sys.executable

tests/test_player.py

@@ -2,13 +2,13 @@ from __future__ import annotations
 
 import os
 import queue
+import sys
 import time
 from pathlib import Path
 
 from beefy_player.player import Player
 
-FAKE_MPV = '''#!/usr/bin/env python3
-import json, os, socket, sys, time
+FAKE_MPV = f"#!{sys.executable}\n" + '''import json, os, socket, sys, time
 
 sock_path = None
 volume = 70

tests/test_spectrum.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import sys
 import time
 from pathlib import Path
 
@@ -8,8 +9,7 @@ import numpy as np
 from beefy_player import spectrum as spectrum_module
 from beefy_player.spectrum import Frame, SpectrumEngine
 
-PCM_SCRIPT = """#!/usr/bin/env python3
-import math, struct, sys, time
+PCM_SCRIPT = f"#!{sys.executable}\n" + """import math, struct, sys, time
 sr = 44100
 samples = [int(0.6 * 32767 * math.sin(2 * math.pi * 1000 * i / sr)) for i in range(4096)]
 chunk = struct.pack("<%dh" % len(samples), *samples)
@@ -303,7 +303,7 @@ def test_tap_audio_is_downmixed_and_retuned() -> None:
 def test_dead_monitor_falls_back_instead_of_flat_bars(tmp_path) -> None:
     script = tmp_path / "silent-parec"
     script.write_text(
-        "#!/usr/bin/env python3\n"
+        f"#!{sys.executable}\n"
         "import sys\n"
         "block = b'\\0' * 4096\n"
         "for _ in range(1000):\n"
@@ -333,7 +333,7 @@ def test_monitor_survives_silence_after_audio(tmp_path, monkeypatch) -> None:
     # replaced by the drifting stream tap) for the rest of the session.
     script = tmp_path / "parec"
     script.write_text(
-        "#!/usr/bin/env python3\n"
+        f"#!{sys.executable}\n"
         "import math, struct, sys, time\n"
         "sr = 44100\n"
         "n = 2048\n"