diff --git a/apps/web/vitest.config.mts b/apps/web/vitest.config.mts
index 4915b13..cf8d8cb 100644
--- a/apps/web/vitest.config.mts
+++ b/apps/web/vitest.config.mts
@@ -6,7 +6,7 @@ export default defineConfig({
   plugins: [tsconfigPaths(), react()],
   test: {
     environment: 'jsdom',
-    exclude: ['**/e2e/**', '**/*.spec.ts'],
+    exclude: ['**/e2e/**', '**/*.spec.ts', '**/node_modules/**'],
     include: ['**/*.test.{ts,tsx}'],
   },
 });
diff --git a/packages/graphql/api/slots.test.js b/packages/graphql/api/slots.test.js
new file mode 100644
index 0000000..3fde691
--- /dev/null
+++ b/packages/graphql/api/slots.test.js
@@ -0,0 +1,303 @@
+import { getClientWithToken } from '../apollo/client';
+import * as GQL from '../types';
+import { ERRORS, SlotsService } from './slots';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+vi.mock('../apollo/client');
+vi.mock('./services');
+vi.mock('../config/env', () => {
+  return {
+    env: {
+      BOT_TOKEN: 'test',
+      LOGIN_GRAPHQL: 'test',
+      PASSWORD_GRAPHQL: 'test',
+      URL_GRAPHQL: 'test',
+    },
+  };
+});
+
+const mockGetClientWithToken = vi.mocked(getClientWithToken);
+
+describe('SlotsService', () => {
+  let slotsService;
+  const mockUser = { telegramId: 123_456_789 };
+
+  const mockCustomer = {
+    documentId: 'customer-123',
+    firstName: 'John',
+    lastName: 'Doe',
+    telegramId: 123_456_789,
+  };
+
+  const mockSlot = {
+    datetime_end: '2024-01-01T11:00:00Z',
+    datetime_start: '2024-01-01T10:00:00Z',
+    documentId: 'slot-123',
+    master: mockCustomer,
+    orders: [],
+    state: GQL.Enum_Slot_State.Open,
+  };
+
+  const mockGetCustomerResult = {
+    data: {
+      customers: [mockCustomer],
+    },
+  };
+
+  const mockGetSlotResult = {
+    data: {
+      slot: mockSlot,
+    },
+  };
+
+  beforeEach(() => {
+    slotsService = new SlotsService(mockUser);
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  describe('updateSlot', () => {
+    const mockVariables = {
+      data: {
+        datetime_end: '2024-01-01T11:00:00Z',
+        datetime_start: '2024-01-01T10:00:00Z',
+        state: GQL.Enum_Slot_State.Open,
+      },
+      documentId: 'slot-123',
+    };
+
+    const mockMutationResult = {
+      data: {
+        updateSlot: mockSlot,
+      },
+      errors: undefined,
+    };
+
+    it('should successfully update slot when user has permission', async () => {
+      const mockMutate = vi.fn().mockResolvedValue(mockMutationResult);
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce(mockGetCustomerResult)
+        .mockResolvedValueOnce(mockGetSlotResult);
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: mockMutate,
+        query: mockQuery,
+      });
+
+      const result = slotsService.updateSlot(mockVariables);
+
+      await expect(result).resolves.toBe(mockMutationResult.data);
+    });
+
+    it('should throw error when user does not have permission', async () => {
+      const unrelatedCustomer = {
+        ...mockCustomer,
+        documentId: 'different-customer-123',
+      };
+
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce({
+          data: { customers: [unrelatedCustomer] },
+        })
+        .mockResolvedValueOnce({
+          data: { slot: mockSlot }, // slot принадлежит другому пользователю
+        });
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: vi.fn(),
+        query: mockQuery,
+      });
+
+      const result = slotsService.updateSlot(mockVariables);
+
+      await expect(result).rejects.toThrow(ERRORS.NO_PERMISSION);
+    });
+
+    it('should throw error when slot does not exist', async () => {
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce(mockGetCustomerResult)
+        .mockResolvedValueOnce({
+          data: { slot: null }, // slot не найден
+        });
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: vi.fn(),
+        query: mockQuery,
+      });
+
+      const result = slotsService.updateSlot(mockVariables);
+
+      await expect(result).rejects.toThrow();
+    });
+
+    it('should throw error when customer is not found', async () => {
+      const mockQuery = vi.fn().mockResolvedValue({
+        data: { customers: [] }, // пользователь не найден
+      });
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: vi.fn(),
+        query: mockQuery,
+      });
+
+      const result = slotsService.updateSlot(mockVariables);
+
+      await expect(result).rejects.toThrow('Customer not found');
+    });
+  });
+
+  describe('checkPermission', () => {
+    const mockVariables = {
+      documentId: 'slot-123',
+    };
+
+    it('should not throw error when user has permission', async () => {
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce(mockGetCustomerResult)
+        .mockResolvedValueOnce(mockGetSlotResult);
+
+      mockGetClientWithToken.mockResolvedValue({
+        query: mockQuery,
+      });
+
+      const result = slotsService.checkPermission(mockVariables);
+
+      await expect(result).resolves.toBeUndefined();
+    });
+
+    it('should throw error when user does not have permission', async () => {
+      const unrelatedCustomer = {
+        ...mockCustomer,
+        documentId: 'different-customer-123',
+      };
+
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce({
+          data: { customers: [unrelatedCustomer] },
+        })
+        .mockResolvedValueOnce({
+          data: { slot: mockSlot }, // slot принадлежит другому пользователю
+        });
+
+      mockGetClientWithToken.mockResolvedValue({
+        query: mockQuery,
+      });
+
+      const result = slotsService.checkPermission(mockVariables);
+
+      await expect(result).rejects.toThrow(ERRORS.NO_PERMISSION);
+    });
+
+    it('should throw error when slot does not exist', async () => {
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce(mockGetCustomerResult)
+        .mockResolvedValueOnce({
+          data: { slot: null }, // slot не найден
+        });
+
+      mockGetClientWithToken.mockResolvedValue({
+        query: mockQuery,
+      });
+
+      const result = slotsService.checkPermission(mockVariables);
+
+      await expect(result).rejects.toThrow();
+    });
+  });
+
+  describe('deleteSlot', () => {
+    const mockVariables = {
+      documentId: 'slot-123',
+    };
+
+    const mockMutationResult = {
+      data: {
+        deleteSlot: {
+          documentId: 'slot-123',
+        },
+      },
+      errors: undefined,
+    };
+
+    it('should successfully delete slot when no orders', async () => {
+      const mockMutate = vi.fn().mockResolvedValue(mockMutationResult);
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce(mockGetCustomerResult)
+        .mockResolvedValue(mockGetSlotResult);
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: mockMutate,
+        query: mockQuery,
+      });
+
+      const result = slotsService.deleteSlot(mockVariables);
+
+      await expect(result).resolves.toBe(mockMutationResult.data);
+    });
+
+    it('should throw error when slot has orders', async () => {
+      const slotWithOrders = {
+        ...mockSlot,
+        orders: [
+          {
+            datetime_end: '2024-01-01T11:00:00Z',
+            datetime_start: '2024-01-01T10:00:00Z',
+            documentId: 'order-123',
+            state: GQL.Enum_Order_State.Scheduled,
+          },
+        ],
+      };
+
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce(mockGetCustomerResult)
+        .mockResolvedValue({
+          data: { slot: slotWithOrders }, // slot с заказами
+        });
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: vi.fn(),
+        query: mockQuery,
+      });
+
+      const result = slotsService.deleteSlot(mockVariables);
+
+      await expect(result).rejects.toThrow(ERRORS.HAS_ORDERS);
+    });
+
+    it('should throw error when user does not have permission', async () => {
+      const unrelatedCustomer = {
+        ...mockCustomer,
+        documentId: 'different-customer-123',
+      };
+
+      const mockQuery = vi
+        .fn()
+        .mockResolvedValueOnce({
+          data: { customers: [unrelatedCustomer] },
+        })
+        .mockResolvedValueOnce({
+          data: { slot: mockSlot }, // slot принадлежит другому пользователю
+        });
+
+      mockGetClientWithToken.mockResolvedValue({
+        mutate: vi.fn(),
+        query: mockQuery,
+      });
+
+      const result = slotsService.deleteSlot(mockVariables);
+
+      await expect(result).rejects.toThrow(ERRORS.NO_PERMISSION);
+    });
+  });
+});
diff --git a/packages/graphql/api/slots.ts b/packages/graphql/api/slots.ts
index 405b4c0..b762488 100644
--- a/packages/graphql/api/slots.ts
+++ b/packages/graphql/api/slots.ts
@@ -6,7 +6,7 @@ import { type VariablesOf } from '@graphql-typed-document-node/core';
 import { getMinutes } from '@repo/utils/datetime-format';
 import dayjs from 'dayjs';
 
-const ERRORS = {
+export const ERRORS = {
   HAS_ORDERS: 'Slot has orders',
   MISSING_DATE: 'Missing date',
   MISSING_SERVICE: 'Missing service',
diff --git a/packages/graphql/vitest.config.mts b/packages/graphql/vitest.config.mts
new file mode 100644
index 0000000..3f22771
--- /dev/null
+++ b/packages/graphql/vitest.config.mts
@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config';
+import tsconfigPaths from 'vite-tsconfig-paths';
+
+export default defineConfig({
+  plugins: [tsconfigPaths()],
+  test: {
+    exclude: ['**/e2e/**', '**/*.spec.ts', '**/node_modules/**'],
+    include: ['**/*.test.{js,ts}'],
+  },
+});