to-migrate.ts

import type {
  Migration,
  MigrationConstructor,
} from '../lib/config/migrations/types';
import type { RenovateConfig } from '../lib/config/types';

declare global {
  // eslint-disable-next-line @typescript-eslint/no-namespace
  namespace jest {
    interface Matchers<R> {
      toMigrate(
        originalConfig: RenovateConfig,
        expectedConfig: RenovateConfig,
        isMigrated?: boolean,
      ): R;
    }
  }
}

expect.extend({
  async toMigrate(
    CustomMigration: MigrationConstructor,
    originalConfig: RenovateConfig,
    expectedConfig: RenovateConfig,
    isMigrated = true,
  ) {
    // async load to avoid circular dependency
    const { MigrationsService } = await import(
      './../lib/config/migrations/migrations-service.js'
    );
    class CustomMigrationsService extends MigrationsService {
      public static override getMigrations(
        original: RenovateConfig,
        migrated: RenovateConfig,
      ): readonly Migration[] {
        return [new CustomMigration(original, migrated)];
      }
    }

    const migratedConfig = CustomMigrationsService.run(originalConfig);

    if (
      MigrationsService.isMigrated(migratedConfig, originalConfig) !==
      isMigrated
    ) {
      return {
        message: (): string => `isMigrated should be ${isMigrated}`,
        pass: false,
      };
    }

    if (!this.equals(migratedConfig, expectedConfig)) {
      return {
        message: (): string =>
          `Migration failed\n\nReceived config:\n${JSON.stringify(
            migratedConfig,
          )}\n\nExpected config:\n${JSON.stringify(expectedConfig)}`,
        pass: false,
      };
    }

    return {
      message: (): string => 'Migration passed successfully',
      pass: true,
    };
  },
});