✅ Cover the CLI with tests

Author: Jamim

tests/test_cli.py

@@ -0,0 +1,33 @@
+import runpy
+import sys
+from unittest.mock import call, patch
+
+import pytest
+from click.testing import CliRunner
+
+import gcm
+from gcm.cli import cli
+
+
+@patch.dict(sys.modules)
+@patch('sys.argv', ['gcm', 'enable', 'foo'])
+@patch('click.echo')
+@patch('gcm.commands.enable.Enable.callback')
+def test_main(callback, echo):
+    del sys.modules['gcm.cli']
+
+    with pytest.raises(SystemExit):
+        runpy.run_module('gcm.cli', run_name='__main__')
+
+    callback.assert_called_once_with(package='app-misc/foo')
+    assert echo.call_args_list == [
+        call('Enabling ccache for \x1b[32m\x1b[1mapp-misc/foo\x1b[0m'),
+        call('\x1b[32mDone :-)\x1b[0m'),
+    ]
+
+
+def test_cli_version():
+    runner = CliRunner()
+    result = runner.invoke(cli, ['--version'])
+    assert result.exit_code == 0
+    assert result.output == f'{gcm.__name__}, version {gcm.__version__}\n'