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88 lines
3.0 KiB
Markdown
88 lines
3.0 KiB
Markdown
# Migration Testing Helpers
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This package provides utilities for testing database migrations by allowing you to stop before a specific migration, insert test data, and then run that migration.
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## API
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### `initDbUpToMigration(beforeMigrationName: string): Promise<void>`
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Initializes the database and runs all migrations up to (but not including) the specified migration.
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**Parameters:**
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- `beforeMigrationName`: The class name of the migration to stop before (e.g., `'AddUserRole1234567890'`)
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**Throws:**
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- `UnexpectedError` if the migration is not found or database is not initialized
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### `runSingleMigration(migrationName: string): Promise<void>`
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Runs a single migration by name.
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**Parameters:**
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- `migrationName`: The class name of the migration to run (e.g., `'AddUserRole1234567890'`)
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**Throws:**
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- `UnexpectedError` if the migration is not found or database is not initialized
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## `undoLastSingleMigration(): Promise<void>`
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Undoes the last single migration.
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## Usage Example
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```typescript
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import { Container } from '@n8n/di';
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import { DataSource } from '@n8n/typeorm';
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import { initDbUpToMigration, runSingleMigration } from '@n8n/backend-test-utils';
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describe('AddUserRole1234567890 Migration', () => {
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let dataSource: DataSource;
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beforeAll(async () => {
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// Initialize database but stop BEFORE the migration we want to test
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await initDbUpToMigration('AddUserRole1234567890');
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dataSource = Container.get(DataSource);
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});
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it('should add role column to users table', async () => {
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// Insert test data in the OLD schema (before migration)
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// You should not use Repositories, because these will break after schema changes
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// over time.
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await dataSource.query(`
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INSERT INTO users (id, email, password)
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VALUES (1, 'test@example.com', 'hashed_password')
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`);
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// Run the migration
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await runSingleMigration('AddUserRole1234567890');
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// Verify the migration worked correctly
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const users = await dataSource.query('SELECT * FROM users WHERE id = 1');
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expect(users[0].role).toBe('member'); // Default role was added
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});
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});
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```
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## How It Works
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1. **`initDbUpToMigration`**:
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- Gets all available migrations from TypeORM DataSource
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- Finds the target migration by name
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- Temporarily replaces the migrations array with only migrations before the target
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- Wraps and runs those migrations
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- Restores the full migrations array
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2. **`runSingleMigration`**:
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- Finds the specific migration by name
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- Temporarily replaces the migrations array with only that migration
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- Wraps and runs that single migration
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- Restores the full migrations array
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## Important Notes
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- These functions must be used with an initialized database connection (after `dbConnection.init()`)
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- Do NOT call `dbConnection.migrate()` before using these helpers - they replace that step
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- Migration wrapping is idempotent - migrations won't be double-wrapped
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- The full migrations array is always restored after operations complete (even on error)
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