feat: add test

Author: JoJoJoJoJoJoJo

tests/test_cli.py

@@ -0,0 +1,34 @@
+from collections import deque
+
+from click import Group
+from click.testing import CliRunner
+
+from mcpm.cli import main
+
+
+def test_cli_help():
+    """Test that all commands have help options."""
+    runner = CliRunner()
+
+    def bfs(cmd):
+        queue = deque([cmd])
+        commands = []
+        while queue:
+            cmd = queue.popleft()
+            sub_cmds = cmd.commands.values()
+            for sub_cmd in sub_cmds:
+                commands.append(sub_cmd)
+                if isinstance(sub_cmd, Group):
+                    queue.append(sub_cmd)
+        return commands
+
+    all_commands = bfs(main)
+    for cmd in all_commands:
+        result = runner.invoke(cmd, ["--help"])
+        assert result.exit_code == 0
+        assert "Usage:" in result.output
+
+    for cmd in all_commands:
+        result = runner.invoke(cmd, ["-h"])
+        assert result.exit_code == 0
+        assert "Usage:" in result.output