e2e(api): add initial functional tests & pytest configuration

Signed-off-by: Arian Nasr <arian@2ari.ca>

e2e/requirements.txt

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+Werkzeug==3.1.8
+pytest==9.0.3
+requests==2.34.2

e2e/unit/api/test_api.py

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+import pytest
+import requests
+import io
+import os
+from werkzeug.utils import secure_filename
+
+
+def test_api_ping(base_url):
+    response = requests.get(f'{base_url}/ping')
+    assert response.status_code == 200
+    assert response.text == 'pong'
+
+def test_api_upload_non_audio_file(base_url, upload_folder):
+    files = {'file': ('test.txt', io.BytesIO(b'not an audio file'))}
+    expected_filename = os.path.join(upload_folder, secure_filename('test.txt'))
+    response = requests.post(f'{base_url}/', files=files)
+    assert response.status_code == 400
+    assert "not allowed" in response.json().get("error", "")
+    assert not os.path.exists(expected_filename)
+
+    if os.path.exists(expected_filename):
+        os.remove(expected_filename)

e2e/unit/conftest.py

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+import pytest
+import os
+
+@pytest.fixture(scope='session')
+def base_url():
+    return os.getenv('BASE_URL', 'http://127.0.0.1:5001')
+
+@pytest.fixture(scope='session')
+def upload_folder():
+    return os.getenv('NAVIDROME_MUSIC_FOLDER', '/opt/navidrome/music')