Add multi-username activity support

tests/test_main.py

@@ -0,0 +1,40 @@
+from datetime import date
+
+import pytest
+
+from app.main import QueryOptions, collect_merged_activity
+from app.settings import Settings
+
+
+@pytest.mark.asyncio
+async def test_collect_merged_activity_combines_multiple_usernames(monkeypatch) -> None:
+    settings = Settings(
+        _env_file=None,
+        GITHUB_USERNAME="octocat, hubot",
+        GITEA_BASE_URL="https://gitea.example.com",
+        GITEA_USERNAME="alice, bob",
+    )
+
+    github_calls: list[str] = []
+    gitea_calls: list[str] = []
+
+    async def fake_fetch_github_activity(username, token, from_date, to_date, timeout_seconds=20.0):
+        github_calls.append(username)
+        return {"2026-01-01": 1 if username == "octocat" else 2}
+
+    async def fake_fetch_gitea_activity(base_url, username, token, from_date, to_date, timeout_seconds=20.0):
+        gitea_calls.append(username)
+        return {"2026-01-01": 3 if username == "alice" else 4}
+
+    monkeypatch.setattr("app.main.fetch_github_activity", fake_fetch_github_activity)
+    monkeypatch.setattr("app.main.fetch_gitea_activity", fake_fetch_gitea_activity)
+
+    result = await collect_merged_activity(
+        settings=settings,
+        cache=None,
+        options=QueryOptions(year=None, days=1, theme="light", source="all"),
+    )
+
+    assert sorted(github_calls) == ["hubot", "octocat"]
+    assert sorted(gitea_calls) == ["alice", "bob"]
+    assert result.merged["2026-01-01"] == {"github": 3, "gitea": 7, "total": 10}