feat: add integration smoke tests

CLI-level smoke tests using --yaml output against real Twitter API.
Default skipped via @pytest.mark.smoke marker + pyproject.toml addopts.
Run locally with: uv run pytest -m smoke -v

tests/test_smoke.py

@@ -0,0 +1,85 @@
+"""Integration smoke tests for twitter-cli.
+
+These tests invoke the real CLI commands with ``--yaml`` against the live
+Twitter/X API using your local browser cookies.  They are **skipped by
+default** and only run when explicitly requested::
+
+    uv run pytest -m smoke -v
+
+Only read-only operations are tested — no writes.
+"""
+
+from __future__ import annotations
+
+import yaml
+import pytest
+from click.testing import CliRunner
+
+from twitter_cli.cli import cli
+
+smoke = pytest.mark.smoke
+
+runner = CliRunner()
+
+
+def _invoke(*args: str):
+    """Run a CLI command with --yaml and return parsed payload."""
+    result = runner.invoke(cli, [*args, "--yaml"])
+    if result.output:
+        payload = yaml.safe_load(result.output)
+    else:
+        payload = None
+    return result, payload
+
+
+# ── Auth ────────────────────────────────────────────────────────────────
+
+
+@smoke
+class TestAuth:
+    """Verify authentication is working end-to-end."""
+
+    def test_status(self):
+        result, payload = _invoke("status")
+        assert result.exit_code == 0, f"status failed: {result.output}"
+        assert payload["ok"] is True
+        assert payload["data"]["authenticated"] is True
+        assert payload["data"]["user"]["username"]
+
+    def test_whoami(self):
+        result, payload = _invoke("whoami")
+        assert result.exit_code == 0, f"whoami failed: {result.output}"
+        assert payload["ok"] is True
+        assert payload["data"]["user"]["username"]
+        assert payload["data"]["user"]["id"]
+
+
+# ── Read-only queries ───────────────────────────────────────────────────
+
+
+@smoke
+class TestReadOnly:
+    """Read-only CLI smoke tests."""
+
+    def test_user(self):
+        result, payload = _invoke("user", "elonmusk")
+        assert result.exit_code == 0, f"user failed: {result.output}"
+        assert payload["ok"] is True
+
+    def test_search(self):
+        result, payload = _invoke("search", "python", "--max", "3")
+        assert result.exit_code == 0, f"search failed: {result.output}"
+        assert payload["ok"] is True
+        items = payload["data"]
+        assert isinstance(items, list)
+        assert len(items) >= 1
+
+    def test_user_posts(self):
+        result, payload = _invoke("user-posts", "elonmusk", "--max", "3")
+        assert result.exit_code == 0, f"user-posts failed: {result.output}"
+        assert payload["ok"] is True
+
+    def test_feed(self):
+        result, payload = _invoke("feed", "--max", "3")
+        assert result.exit_code == 0, f"feed failed: {result.output}"
+        assert payload["ok"] is True