Test tag and encode

tests/__snapshots__/test_tag.ambr

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+# serializer version: 1
+# name: test_main
+  ''
+# ---
+# name: test_main.1
+  _Call(
+    tuple(
+      list([
+        'lame',
+        '--preset',
+        'standard',
+        '--ta',
+        'Bluu',
+        '--tl',
+        'Album Title Here',
+        '--tn',
+        '01',
+        '--tt',
+        'Song Title Here',
+        'TMP_PATH_HERE/path/to/Album Title Here/01 - Song Title Here.wav',
+        'TMP_PATH_HERE/path/to/Album Title Here/01 - Song Title Here.mp3',
+      ]),
+    ),
+    dict({
+    }),
+  )
+# ---

tests/test_tag.py

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+"""Tag and encode tests."""
+
+from pathlib import Path
+from unittest import mock
+
+from click.testing import CliRunner
+from music.__main__ import tag
+from syrupy.assertion import SnapshotAssertion
+
+
+@mock.patch("subprocess.check_call")
+def test_main(
+    mock_subprocess: mock.Mock, snapshot: SnapshotAssertion, tmp_path: Path
+) -> None:
+    """Test main calls the expected subprocess."""
+    some_path = (
+        tmp_path / "path" / "to" / "Album Title Here" / "01 - Song Title Here.wav"
+    )
+    some_path.parent.mkdir(parents=True, exist_ok=True)
+    some_path.touch()
+
+    result = CliRunner(mix_stderr=False).invoke(tag, [str(some_path)])
+
+    assert not result.stderr
+    assert not result.exception
+    assert result.stdout == snapshot
+
+    assert mock_subprocess.call_args == snapshot