integration tests

core/leagues/application/use-cases/LeaveLeagueUseCase.ts

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+import { LeagueRepository } from '../ports/LeagueRepository';
+import { DriverRepository } from '../ports/DriverRepository';
+import { EventPublisher } from '../ports/EventPublisher';
+import { LeaveLeagueCommand } from '../ports/LeaveLeagueCommand';
+
+export class LeaveLeagueUseCase {
+  constructor(
+    private readonly leagueRepository: LeagueRepository,
+    private readonly driverRepository: DriverRepository,
+    private readonly eventPublisher: EventPublisher,
+  ) {}
+
+  async execute(command: LeaveLeagueCommand): Promise<void> {
+    // TODO: Implement leave league logic
+    // This is a placeholder implementation
+    // In a real implementation, this would:
+    // 1. Validate the league exists
+    // 2. Validate the driver exists
+    // 3. Check if the driver is a member of the league
+    // 4. Remove the driver from the league
+    // 5. Emit appropriate events
+    throw new Error('LeaveLeagueUseCase not implemented');
+  }
+}