test+ci: add regression tests and GitHub Actions workflow

tests/conftest.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+
+from twitter_cli.models import Author, Metrics, Tweet
+
+
+@pytest.fixture()
+def tweet_factory():
+    def _make_tweet(tweet_id: str = "1", **overrides: Any) -> Tweet:
+        metrics = overrides.pop(
+            "metrics",
+            Metrics(likes=10, retweets=2, replies=1, quotes=0, views=120, bookmarks=3),
+        )
+        author = overrides.pop(
+            "author",
+            Author(id="u1", name="Alice", screen_name="alice", verified=False),
+        )
+        return Tweet(
+            id=tweet_id,
+            text=overrides.pop("text", "hello"),
+            author=author,
+            metrics=metrics,
+            created_at=overrides.pop("created_at", "2025-01-01"),
+            media=overrides.pop("media", []),
+            urls=overrides.pop("urls", []),
+            is_retweet=overrides.pop("is_retweet", False),
+            lang=overrides.pop("lang", "en"),
+            retweeted_by=overrides.pop("retweeted_by", None),
+            quoted_tweet=overrides.pop("quoted_tweet", None),
+            score=overrides.pop("score", 0.0),
+        )
+
+    return _make_tweet