"""Shared test setup.

Puts the repo root on sys.path so `import isr`, `import web` and
`import isrweb.*` work regardless of where pytest is invoked from. This used
to be an inline sys.path.insert at the top of test_isr.py, which only
happened to work for the other test modules because that file imported first.
"""

import os
import sys
import wave

import pytest

sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))


@pytest.fixture
def write_wav():
    """Factory for small 16-bit WAV files. Returns the path written."""
    def _write(path, seconds=2, framerate=8000, channels=1, sampwidth=2,
               frames=None):
        with wave.open(str(path), 'wb') as wf:
            wf.setnchannels(channels)
            wf.setsampwidth(sampwidth)
            wf.setframerate(framerate)
            wf.writeframes(frames if frames is not None
                           else b'\x00\x00' * (seconds * framerate * channels))
        return path
    return _write