import pytest
from app.core.db_engine import DatabaseEngine


def test_database_engine_init():
    """测试数据库引擎初始化"""
    engine = DatabaseEngine()
    assert engine.engine is not None
    assert engine.Session is not None


def test_execute_sql_select():
    """测试执行 SELECT 查询"""
    engine = DatabaseEngine()
    result = engine.execute_sql("SELECT 1 AS test")
    assert result is not None
    assert len(result) > 0


def test_table_exists():
    """测试表存在性检查"""
    engine = DatabaseEngine()
    # 假设 SYS_FORM 表存在
    exists = engine.table_exists("SYS_FORM")
    assert exists is True