test(reports): add unit tests for ReportsController and ReportsRepository with mocked dependencies

backend/src/reports/repositories/reports.repository.spec.ts

@@ -0,0 +1,69 @@
+import { Test, TestingModule } from "@nestjs/testing";
+import { DatabaseService } from "../../database/database.service";
+import { ReportsRepository } from "./reports.repository";
+
+describe("ReportsRepository", () => {
+	let repository: ReportsRepository;
+
+	const mockDb = {
+		select: jest.fn().mockReturnThis(),
+		from: jest.fn().mockReturnThis(),
+		orderBy: jest.fn().mockReturnThis(),
+		where: jest.fn().mockReturnThis(),
+		limit: jest.fn().mockReturnThis(),
+		offset: jest.fn().mockReturnThis(),
+		insert: jest.fn().mockReturnThis(),
+		values: jest.fn().mockReturnThis(),
+		update: jest.fn().mockReturnThis(),
+		set: jest.fn().mockReturnThis(),
+		delete: jest.fn().mockReturnThis(),
+		returning: jest.fn().mockReturnThis(),
+		execute: jest.fn(),
+	};
+
+	const wrapWithThen = (obj: any) => {
+		obj.then = function (onFulfilled: any) {
+			const result = this.execute();
+			return Promise.resolve(result).then(onFulfilled);
+		};
+		return obj;
+	};
+	wrapWithThen(mockDb);
+
+	beforeEach(async () => {
+		const module: TestingModule = await Test.createTestingModule({
+			providers: [
+				ReportsRepository,
+				{ provide: DatabaseService, useValue: { db: mockDb } },
+			],
+		}).compile();
+
+		repository = module.get<ReportsRepository>(ReportsRepository);
+	});
+
+	it("should create report", async () => {
+		(mockDb.execute as jest.Mock).mockResolvedValue([{ id: "1" }]);
+		const result = await repository.create({ reporterId: "u", reason: "spam" });
+		expect(result.id).toBe("1");
+	});
+
+	it("should find all", async () => {
+		(mockDb.execute as jest.Mock).mockResolvedValue([{ id: "1" }]);
+		const result = await repository.findAll(10, 0);
+		expect(result).toHaveLength(1);
+	});
+
+	it("should update status", async () => {
+		(mockDb.execute as jest.Mock).mockResolvedValue([
+			{ id: "1", status: "resolved" },
+		]);
+		const result = await repository.updateStatus("1", "resolved");
+		expect(result[0].status).toBe("resolved");
+	});
+
+	it("should purge obsolete", async () => {
+		(mockDb.execute as jest.Mock).mockResolvedValue([{ id: "1" }]);
+		await repository.purgeObsolete(new Date());
+		expect(mockDb.delete).toHaveBeenCalled();
+	});
+});