[wip] Add unit tests for CLI parser

ovgenpy/cli.py

@@ -146,6 +146,8 @@ def main(
     if show_gui:
         raise OvgenError('GUI not implemented')
     else:
+        if not files:
+            raise click.ClickException('Must specify files or folders to play')
         if write:
             if audio:
                 write_path = Path(audio).with_suffix(YAML_NAME)

tests/test_cli.py

@@ -0,0 +1,44 @@
+import os
+import shlex
+from contextlib import contextmanager
+from typing import TYPE_CHECKING, List, Tuple, ContextManager, Callable
+
+import click
+import pytest
+from click.testing import CliRunner
+
+from ovgenpy import cli
+from ovgenpy.config import yaml
+from ovgenpy.ovgenpy import Config
+
+if TYPE_CHECKING:
+    import pytest_mock
+
+
+def call_main(args):
+    return CliRunner().invoke(cli.main, args, catch_exceptions=False, standalone_mode=False)
+
+
+# ovgenpy configuration sinks
+
+def write_yaml(command):
+    args = shlex.split(command) + ['-w']
+    return call_main(args)
+
+
+def play(command):
+    args = shlex.split(command) + ['-p']
+    return call_main(args)
+
+
+# ovgenpy configuration sources
+
+@pytest.mark.parametrize('runner', [write_yaml, play])
+def test_no_files(runner):
+    with pytest.raises(click.ClickException):
+        runner('')
+
+
+@pytest.mark.parametrize('runner', [write_yaml, play])
+def test_cwd(runner):
+    runner('.')