118 lines
5.1 KiB
Python
118 lines
5.1 KiB
Python
"""Alembic 迁移链冒烟测试（不依赖真实 MySQL）。
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覆盖三件事：
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1. 链完整性：只有一个头版本、头与最新迁移一致、每个修订的
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down_revision 都能回溯到根（无悬挂引用、无分叉链）。
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2. 全部迁移脚本可编译：防止迁移文件被改坏后部署流程才暴露。
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3. 空库整链执行：迁移脚本自带方言防护（MySQL 专属 DDL 有 _is_mysql()
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之类分支），整条链可在 SQLite 上真实执行 `upgrade head`，随后校验
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表/列/索引与 Base.metadata 模型元数据对齐（模型要求的不允许缺失），
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并确认迁移新增的复合查询索引确实落库。
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"""
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import tempfile
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from pathlib import Path
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from alembic import command
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from alembic.config import Config
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from alembic.script import ScriptDirectory
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from sqlalchemy import create_engine, inspect
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TESTS_DIR = Path(__file__).resolve().parent
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PROJECT_ROOT = TESTS_DIR.parent
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VERSIONS_DIR = PROJECT_ROOT / "web" / "backend" / "migrations" / "versions"
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HEAD_REVISION = "20260830_0031"
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# 迁移新增、但不声明在模型里的复合查询索引。
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EXTRA_INDEXES = (
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"ix_douyu_tasks_handbook_scope_id",
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"ix_douyu_tasks_handbook_scope_task_type_id",
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"ix_douyu_tasks_status_finished_at_id",
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"ix_login_tasks_status_finished_at_id",
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)
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def _migration_config() -> Config:
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config = Config(str(PROJECT_ROOT / "alembic.ini"))
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config.set_main_option(
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"script_location", str(PROJECT_ROOT / "web" / "backend" / "migrations")
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)
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return config
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class TestMigrationSmoke:
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def test_chain_is_linear_and_head_matches_latest_file(self):
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directory = ScriptDirectory.from_config(_migration_config())
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heads = directory.get_heads()
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assert len(heads) == 1, f"迁移链出现多个头版本（存在分叉）: {heads}"
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assert heads[0] == HEAD_REVISION, f"头版本 {heads[0]} 与最新迁移不一致"
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version_files = sorted(path.name for path in VERSIONS_DIR.glob("*.py"))
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revisions = list(directory.walk_revisions())
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revision_ids = {revision.revision for revision in revisions}
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assert len(revision_ids) == len(version_files), (
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"迁移文件数量与已加载修订数量不一致（存在无法加载的脚本）"
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)
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for revision in revisions:
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if revision.down_revision is not None:
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assert revision.down_revision in revision_ids, (
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f"{revision.revision} 引用了不存在的父版本 {revision.down_revision}"
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)
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def test_all_migration_scripts_compile(self):
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for path in sorted(VERSIONS_DIR.glob("*.py")):
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source = path.read_text(encoding="utf-8")
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compile(source, str(path), "exec") # 语法/缩进等编译错误会在此抛出
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def test_full_chain_applies_on_fresh_sqlite_and_matches_models(self):
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"""空库执行整条迁移链，校验表/列/索引与模型元数据对齐。"""
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import web.backend.database as database_module
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from web.backend.database import Base
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original_url = database_module.DATABASE_URL
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with tempfile.TemporaryDirectory() as tmp:
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db_path = Path(tmp) / "migrate.db"
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try:
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# env.py 会用模块级 DATABASE_URL 覆盖配置里的 sqlalchemy.url。
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database_module.DATABASE_URL = f"sqlite:///{db_path}"
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command.upgrade(_migration_config(), "head")
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inspector = inspect(create_engine(f"sqlite:///{db_path}"))
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db_tables = set(inspector.get_table_names())
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assert db_tables
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model_tables = Base.metadata.tables
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missing_tables = set(model_tables) - db_tables
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assert not missing_tables
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all_db_indexes = set()
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for name, table in model_tables.items():
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db_columns = {
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column["name"] for column in inspector.get_columns(name)
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}
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model_columns = set(table.columns.keys())
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missing_columns = model_columns - db_columns
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assert not missing_columns
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db_indexes = set()
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for index in inspector.get_indexes(name):
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index_name = index["name"]
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if index_name and not index_name.startswith("sqlite_autoindex"):
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db_indexes.add(index_name)
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all_db_indexes |= db_indexes
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model_indexes = {
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index.name for index in table.indexes if index.name
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}
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missing_indexes = model_indexes - db_indexes
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assert not missing_indexes
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# 迁移新增的复合查询索引（不入模型，但应存在）。
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for index_name in EXTRA_INDEXES:
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assert index_name in all_db_indexes, (
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f"迁移链未创建索引 {index_name}"
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)
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finally:
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database_module.DATABASE_URL = original_url
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