test: add E2E test for PNG + JSON output validation

tests/test_e2e.py

@@ -0,0 +1,50 @@
+"""E2E 测试（需要 TDengine 容器）。"""
+
+import json
+import subprocess
+import pytest
+
+
+@pytest.mark.e2e
+def test_e2e_generates_png_and_json():
+    """跑 e2e Python 子命令，验证 PNG + JSON 输出。"""
+    project_dir = __import__("pathlib").Path(__file__).parent.parent
+
+    # 检查 TDengine 容器是否在运行
+    result = subprocess.run(
+        ["docker", "compose", "exec", "-T", "tdengine", "taos", "-s", "SELECT 1"],
+        capture_output=True, text=True, cwd=str(project_dir),
+    )
+    if result.returncode != 0:
+        pytest.skip("TDengine container not running (docker compose up -d first)")
+
+    # 清空旧输出
+    for d in ["render", "logs"]:
+        p = project_dir / d
+        if p.exists():
+            for f in p.iterdir():
+                f.unlink()
+
+    # 跑 e2e Python（不拉容器——假设已有）
+    r = subprocess.run(
+        ["uv", "run", "python", "-m", "ts_anomaly_td", "e2e",
+         "--data-dir", "data", "--output-dir", "render", "--log-dir", "logs"],
+        capture_output=True, text=True, cwd=str(project_dir),
+        timeout=300,
+    )
+
+    print("STDOUT:", r.stdout[-2000:])
+    print("STDERR:", r.stderr[-2000:])
+
+    # 验证 PNG
+    pngs = list((project_dir / "render").glob("*.png"))
+    assert len(pngs) >= 1, f"no PNGs found, stdout: {r.stdout[-500:]}"
+    for png in pngs:
+        assert png.stat().st_size > 10240, f"{png.name} too small: {png.stat().st_size} bytes"
+
+    # 验证 JSON 日志
+    logs = list((project_dir / "logs").glob("e2e_*.json"))
+    assert len(logs) >= 1, "no JSON logs found"
+    log_data = json.loads(logs[0].read_text())
+    assert "datasets" in log_data
+    assert len(log_data["datasets"]) >= 1