adding tests

.coveragerc

@@ -0,0 +1,26 @@
+# .coveragerc to control coverage.py
+[run]
+branch = True
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code:
+    def __repr__
+    if self\.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+
+    # Don't complain about abstract methods, they aren't run:
+    @(abc\.)?abstractmethod
+
+ignore_errors = True

pytest.ini

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+[pytest]
+log_cli_level = DEBUG
+addopts = --cov=croaker/ --cov-report=term-missing

test/test_playlist.py

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+from pathlib import Path
+from unittest.mock import MagicMock
+
+import pytest
+
+import croaker.playlist
+import croaker.path
+
+@pytest.fixture(autouse=True)
+def mock_env(monkeypatch):
+    fixtures = Path(__file__).parent / 'fixtures'
+    monkeypatch.setenv('CROAKER_ROOT', str(fixtures))
+    monkeypatch.setenv('MEDIA_GLOB', '*.mp3,*.foo,*.bar')
+
+
+def test_playlist_loading():
+    pl = croaker.playlist.Playlist(name='test_playlist')
+    path = str(pl.path)
+    tracks = [str(t) for t in pl.tracks]
+
+    assert path == str(croaker.path.playlist_root() / pl.name)
+    assert pl.name == 'test_playlist'
+    assert tracks[0] == f"{path}/_theme.mp3"
+    assert f"{path}/one.mp3" in tracks
+    assert f"{path}/two.mp3" in tracks
+    assert f"{path}/one.foo" in tracks
+    assert f"{path}/one.baz" not in tracks
+
+
+@pytest.mark.parametrize('paths, make_theme, expected_count', [
+    (['test_playlist'], True, 4),
+    (['test_playlist'], False, 4),
+    (['test_playlist', 'sources/one.mp3'], True, 5),
+    (['test_playlist', 'sources/one.mp3'], False, 5),
+])
+def test_playlist_creation(monkeypatch, paths, make_theme, expected_count):
+    new_symlinks = []
+
+    def symlink(target):
+        new_symlinks.append(target)
+
+    pl = croaker.playlist.Playlist(name='foo')
+    monkeypatch.setattr(croaker.playlist.Path, 'unlink', MagicMock())
+    monkeypatch.setattr(croaker.playlist.Path, 'symlink_to', MagicMock(side_effect=symlink))
+    monkeypatch.setattr(croaker.playlist.Path, 'mkdir', MagicMock())
+
+    pl.add([croaker.path.playlist_root() / p for p in paths], make_theme)
+    assert len(new_symlinks) == expected_count