[CVAT][Exchange Oracle] Use Alembic in tests

packages/examples/cvat/exchange-oracle/alembic/env.py

@@ -49,6 +49,7 @@ def run_migrations_offline() -> None:
         target_metadata=target_metadata,
         literal_binds=True,
         dialect_opts={"paramstyle": "named"},
+        output_buffer=config.output_buffer,
     )
 
     with context.begin_transaction():

packages/examples/cvat/exchange-oracle/alembic/versions/1707173682_non_unique_escrows_c1e74c227cfe.py

@@ -6,6 +6,11 @@
 
 """
 
+import os
+
+from sqlalchemy import Column, String, delete, func, select
+from sqlalchemy.orm import declarative_base
+
 from alembic import op
 
 # revision identifiers, used by Alembic.
@@ -14,6 +19,14 @@
 branch_labels = None
 depends_on = None
 
+Base = declarative_base()
+
+
+class Project(Base):
+    __tablename__ = "projects"
+    id = Column(String, primary_key=True, index=True)
+    escrow_address = Column(String(42), unique=False, nullable=False)
+
 
 def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
@@ -22,6 +35,22 @@ def upgrade() -> None:
 
 
 def downgrade() -> None:
+    offline_mode = op.get_context().environment_context.is_offline_mode()
+    assert offline_mode or "TESTING" in os.environ or "test" in op.get_bind().engine.url, (
+        "This downgrade deletes data and should only run in a test environment."
+        "If you are sure you want to run it, set the TESTING environment variable."
+    )
+
+    op.execute(
+        delete(Project).where(
+            Project.escrow_address.in_(
+                select(Project.escrow_address)
+                .group_by(Project.escrow_address)
+                .having(func.count(Project.escrow_address) > 1)
+            )
+        )
+    )
+
     # ### commands auto generated by Alembic - please adjust! ###
     op.create_unique_constraint("projects_escrow_address_key", "projects", ["escrow_address"])
     # ### end Alembic commands ###

packages/examples/cvat/exchange-oracle/alembic/versions/1727205503_add_assignment_updated_at_2cbc85686054.py

@@ -9,8 +9,8 @@
 import enum
 
 import sqlalchemy as sa
-from sqlalchemy import Column, DateTime, Enum, String
-from sqlalchemy.orm import Session, declarative_base
+from sqlalchemy import Column, DateTime, Enum, String, update
+from sqlalchemy.orm import declarative_base
 from sqlalchemy.sql import func
 
 from alembic import op
@@ -51,25 +51,36 @@ class Assignment(Base):
 
 
 def define_initial_updated_at():
-    bind = op.get_bind()
-    session = Session(bind=bind)
-
-    session.query(Assignment).filter(
-        Assignment.updated_at == None,
-        Assignment.status.in_(
-            [AssignmentStatuses.expired, AssignmentStatuses.rejected, AssignmentStatuses.canceled]
-        ),
-    ).update({Assignment.updated_at: Assignment.expires_at})
-
-    session.query(Assignment).filter(
-        Assignment.updated_at == None,
-        Assignment.status == AssignmentStatuses.completed,
-    ).update({Assignment.updated_at: Assignment.completed_at})
-
-    session.query(Assignment).filter(
-        Assignment.updated_at == None,
-        # fallback for invalid entries above + handling of status == "created"
-    ).update({Assignment.updated_at: Assignment.created_at})
+    # First update: expired, rejected, and canceled assignments
+    # using op.execute instead of session.execute to support offline migrations
+    op.execute(
+        update(Assignment)
+        .where(
+            Assignment.updated_at == None,
+            Assignment.status.in_(
+                [
+                    AssignmentStatuses.expired,
+                    AssignmentStatuses.rejected,
+                    AssignmentStatuses.canceled,
+                ]
+            ),
+        )
+        .values(updated_at=Assignment.expires_at)
+    )
+
+    # Second update: completed assignments
+    op.execute(
+        update(Assignment)
+        .where(Assignment.updated_at == None, Assignment.status == AssignmentStatuses.completed)
+        .values(updated_at=Assignment.completed_at)
+    )
+
+    # Third update: fallback for invalid entries and handling status == "created"
+    op.execute(
+        update(Assignment)
+        .where(Assignment.updated_at == None)
+        .values(updated_at=Assignment.created_at)
+    )
 
 
 def upgrade() -> None:

packages/examples/cvat/exchange-oracle/tests/conftest.py

@@ -1,17 +1,84 @@
 from collections.abc import Generator
+from dataclasses import dataclass
+from io import StringIO
+from pathlib import Path
 
 import pytest
 from fastapi.testclient import TestClient
+from sqlalchemy import TextClause, text
 from sqlalchemy.orm import Session
+from sqlalchemy_utils import create_database, database_exists, drop_database
 
+from alembic import command as alembic_command
+from alembic.config import Config
 from src import app
-from src.db import Base, SessionLocal, engine
+from src.db import SessionLocal, engine
+
+alembic_config = Config(Path(__file__).parent.parent / "alembic.ini")
+
+
+@dataclass
+class AlembicSQL:
+    upgrade: TextClause
+    downgrade: TextClause
+
+
+@pytest.fixture(scope="session")
+def alembic() -> AlembicSQL:
+    """
+    Captures the SQL generated by Alembic for upgrade/downgrade operations.
+    Doesn't actually run migrations.
+    """
+    alembic_config.output_buffer = StringIO()
+    alembic_command.upgrade(alembic_config, "head", sql=True)
+    upgrade_sql = alembic_config.output_buffer.getvalue()
+
+    alembic_config.output_buffer = StringIO()
+    alembic_command.downgrade(alembic_config, "head:base", sql=True)
+    downgrade_sql = alembic_config.output_buffer.getvalue()
+
+    return AlembicSQL(text(upgrade_sql), text(downgrade_sql))
+
+
+@pytest.fixture(scope="session", autouse=True)
+def setup_db(alembic) -> None:
+    assert "test" in engine.url.database, "The test database must be used for testing."
+    if database_exists(engine.url):
+        drop_database(engine.url)
+    create_database(engine.url)
+    yield  # Run the test cases
+
+    # Upgrade to the latest version after all tests are done,
+    # this helps with inspection of the latest schema.
+    with engine.connect() as connection:
+        connection.execute(alembic.upgrade)
 
 
 @pytest.fixture(autouse=True)
-def db():
-    Base.metadata.drop_all(bind=engine)
-    Base.metadata.create_all(bind=engine)
+def init_db(alembic) -> None:
+    """
+    Runs the recorded Alembic upgrade and downgrade SQL for each test.
+    This ensures correctness of alembic migrations.
+    """
+    try:
+        with engine.connect() as connection:
+            connection.execute(alembic.upgrade)
+    except Exception as e:
+        raise RuntimeError(
+            "Failed to upgrade migrations, `alembic upgrade head` would fail."
+            " inspect the cause error and change migrations accordingly."
+        ) from e
+
+    yield  # Run the test case
+
+    try:
+        with engine.connect() as connection:
+            connection.execute(alembic.downgrade)
+    except Exception as e:
+        raise RuntimeError(
+            "Failed to downgrade migrations, `alembic downgrade head:base` would fail."
+            " inspect the cause error and change migrations accordingly."
+        ) from e
 
 
 @pytest.fixture(scope="module")