diff --git a/packages/backend/test/unit/RoleService.ts b/packages/backend/test/unit/RoleService.ts
new file mode 100644
index 0000000000..c6410393fb
--- /dev/null
+++ b/packages/backend/test/unit/RoleService.ts
@@ -0,0 +1,145 @@
+process.env.NODE_ENV = 'test';
+
+import { jest } from '@jest/globals';
+import { ModuleMocker } from 'jest-mock';
+import { Test } from '@nestjs/testing';
+import { DataSource } from 'typeorm';
+import { GlobalModule } from '@/GlobalModule.js';
+import { RoleService } from '@/core/RoleService.js';
+import type { Role, RolesRepository, RoleAssignmentsRepository, UsersRepository } from '@/models/index.js';
+import { DI } from '@/di-symbols.js';
+import { CoreModule } from '@/core/CoreModule.js';
+import { MetaService } from '@/core/MetaService.js';
+import type { TestingModule } from '@nestjs/testing';
+import type { MockFunctionMetadata } from 'jest-mock';
+
+const moduleMocker = new ModuleMocker(global);
+
+describe('RoleService', () => {
+	let app: TestingModule;
+	let roleService: RoleService;
+	let usersRepository: UsersRepository;
+	let rolesRepository: RolesRepository;
+	let roleAssignmentsRepository: RoleAssignmentsRepository;
+	let metaService: jest.Mocked<MetaService>;
+
+	function createUser() {
+		return usersRepository.insert({
+			id: 'a',
+			createdAt: new Date(),
+			username: 'a',
+			usernameLower: 'a',
+		})
+			.then(x => usersRepository.findOneByOrFail(x.identifiers[0]));
+	}
+
+	function createRole(data: Partial<Role>) {
+		return rolesRepository.insert({
+			id: 'a',
+			createdAt: new Date(),
+			updatedAt: new Date(),
+			lastUsedAt: new Date(),
+			description: '',
+			...data,
+		})
+			.then(x => rolesRepository.findOneByOrFail(x.identifiers[0]));
+	}
+
+	beforeEach(async () => {
+		app = await Test.createTestingModule({
+			imports: [
+				GlobalModule,
+			],
+			providers: [
+				RoleService,
+			],
+		})
+			.useMocker((token) => {
+				if (token === MetaService) {
+					return { fetch: jest.fn() };
+				}
+				if (typeof token === 'function') {
+					const mockMetadata = moduleMocker.getMetadata(token) as MockFunctionMetadata<any, any>;
+					const Mock = moduleMocker.generateFromMetadata(mockMetadata);
+					return new Mock();
+				}
+			})
+			.compile();
+
+		app.enableShutdownHooks();
+
+		roleService = app.get<RoleService>(RoleService);
+		usersRepository = app.get<UsersRepository>(DI.usersRepository);
+		rolesRepository = app.get<RolesRepository>(DI.rolesRepository);
+		roleAssignmentsRepository = app.get<RoleAssignmentsRepository>(DI.roleAssignmentsRepository);
+
+		metaService = app.get<MetaService>(MetaService) as jest.Mocked<MetaService>;
+	});
+
+	afterEach(async () => {
+		await Promise.all([
+			app.get(DI.metasRepository).delete({}),
+			usersRepository.delete({}),
+			rolesRepository.delete({}),
+			roleAssignmentsRepository.delete({}),
+		]);
+		await app.close();
+	});
+
+	describe('getUserPolicies', () => {
+		it('instance default policies', async () => {	
+			const user = await createUser();
+			metaService.fetch.mockResolvedValue({
+				policies: {
+					canManageCustomEmojis: false,
+				},
+			});
+	
+			const result = await roleService.getUserPolicies(user.id);
+	
+			expect(result.canManageCustomEmojis).toBe(false);
+		});
+	
+		it('instance default policies 2', async () => {	
+			const user = await createUser();
+			metaService.fetch.mockResolvedValue({
+				policies: {
+					canManageCustomEmojis: true,
+				},
+			});
+	
+			const result = await roleService.getUserPolicies(user.id);
+	
+			expect(result.canManageCustomEmojis).toBe(true);
+		});
+	
+		it('with role', async () => {	
+			const user = await createUser();
+			const role = await createRole({
+				name: 'a',
+				policies: {
+					canManageCustomEmojis: {
+						useDefault: false,
+						priority: 0,
+						value: true,
+					},
+				},
+			});
+			await roleAssignmentsRepository.insert({
+				id: 'a',
+				createdAt: new Date(),
+				roleId: role.id,
+				userId: user.id,
+			});
+			metaService.fetch.mockResolvedValue({
+				policies: {
+					canManageCustomEmojis: false,
+				},
+			});
+	
+			const result = await roleService.getUserPolicies(user.id);
+	
+			expect(result.canManageCustomEmojis).toBe(true);
+		});
+	});
+});