From 1aa4c0c352a77fca01f00399a66192127cd9bd32 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Sun, 19 Apr 2026 02:07:44 +0000
Subject: [PATCH] Add acoustic_recorder/tests/test_core.py

---
 acoustic_recorder/tests/test_core.py | 80 ++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 acoustic_recorder/tests/test_core.py

diff --git a/acoustic_recorder/tests/test_core.py b/acoustic_recorder/tests/test_core.py
new file mode 100644
index 0000000..18afc91
--- /dev/null
+++ b/acoustic_recorder/tests/test_core.py
@@ -0,0 +1,80 @@
+import io
+import os
+import wave
+import tempfile
+from pathlib import Path
+from unittest import mock
+
+import numpy as np
+import pytest
+
+import acoustic_recorder.core as core
+
+
+@pytest.fixture
+def mock_wav_file(tmp_path):
+    path = tmp_path / "test_output.wav"
+    return path
+
+
+@pytest.fixture
+def mock_recording(monkeypatch):
+    def fake_rec(duration, samplerate, channels):
+        assert duration > 0
+        t = np.linspace(0, duration, int(samplerate * duration), endpoint=False)
+        # Generate simple sine wave for deterministic output
+        data = np.sin(2 * np.pi * 440 * t)
+        return np.stack([data for _ in range(channels)], axis=1).astype(np.float32)
+
+    monkeypatch.setattr(core.sd, "rec", fake_rec)
+    monkeypatch.setattr(core.sd, "wait", lambda: None)
+    return True
+
+
+def test_record_audio_creates_wav(mock_recording, mock_wav_file, monkeypatch):
+    monkeypatch.setattr(core.Path, "cwd", lambda: mock_wav_file.parent)
+
+    result_path = core.record_audio(1)
+
+    assert isinstance(result_path, str)
+    path_obj = Path(result_path)
+    assert path_obj.suffix == ".wav"
+    assert path_obj.exists()
+    with wave.open(path_obj, 'rb') as wf:
+        frames = wf.getnframes()
+        channels = wf.getnchannels()
+        sampwidth = wf.getsampwidth()
+
+    assert channels == 1 or channels == 2
+    assert frames > 0
+    assert sampwidth > 0
+
+
+def test_record_audio_invalid_duration_raises(monkeypatch):
+    with pytest.raises(ValueError):
+        core.record_audio(0)
+    with pytest.raises(ValueError):
+        core.record_audio(-5)
+
+
+def test_record_audio_path_uniqueness(mock_recording, tmp_path, monkeypatch):
+    monkeypatch.setattr(core.sd, "rec", lambda d, samplerate, channels: np.zeros((int(samplerate * d), channels)))
+    monkeypatch.setattr(core.sd, "wait", lambda: None)
+    monkeypatch.setattr(core.Path, "cwd", lambda: tmp_path)
+
+    path1 = Path(core.record_audio(1))
+    path2 = Path(core.record_audio(1))
+
+    assert path1 != path2
+    assert path1.exists()
+    assert path2.exists()
+
+
+def test_record_audio_file_content_is_nonempty(mock_recording, tmp_path, monkeypatch):
+    monkeypatch.setattr(core.Path, "cwd", lambda: tmp_path)
+
+    file_path = core.record_audio(1)
+    with open(file_path, 'rb') as f:
+        content = f.read()
+
+    assert len(content) > 44  # WAV header + data
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