test: add tests for multiple --dep flags and deprecation warning

- test_cli_dep_multiple: test multiple --dep flags (--dep numpy --dep pydantic)
- test_cli_dep_and_deps_combined: test combining --dep and --deps
- test_cli_deps_deprecation_warning: verify deprecation warning is emitted

Author: juan-abia

tests/test_cli.py

@@ -1,5 +1,7 @@
 from __future__ import annotations as _annotations
 
+import warnings
+
 import pytest
 
 from mcp_run_python._cli import cli_logic
@@ -20,5 +22,25 @@ def test_cli_dep_repeatable():
     assert cli_logic(['--dep', 'numpy', 'example']) == 0
 
 
+def test_cli_dep_multiple():
+    """Test multiple --dep flags"""
+    assert cli_logic(['--dep', 'numpy', '--dep', 'pydantic', 'example']) == 0
+
+
+def test_cli_dep_and_deps_combined():
+    """Test combining --dep and --deps (backwards compat)"""
+    assert cli_logic(['--dep', 'numpy', '--deps', 'pydantic', 'example']) == 0
+
+
+def test_cli_deps_deprecation_warning():
+    """Test that --deps emits a deprecation warning"""
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter('always')
+        cli_logic(['--deps', 'numpy', 'example'])
+        deprecation_warnings = [x for x in w if issubclass(x.category, DeprecationWarning)]
+        assert len(deprecation_warnings) >= 1
+        assert any('--deps is deprecated' in str(x.message) for x in deprecation_warnings)
+
+
 def test_cli_example_fail():
     assert cli_logic(['example']) == 1