diff --git a/web/src/domain/__tests__/admin.use-cases.test.tsx b/web/src/domain/__tests__/admin.use-cases.test.tsx
new file mode 100644
index 0000000..617ee08
--- /dev/null
+++ b/web/src/domain/__tests__/admin.use-cases.test.tsx
@@ -0,0 +1,87 @@
+// Admin domain use-case hooks: state transitions must cross-domain
+// invalidate the proposals/lineItems keys (domain README rule 3). The domain
+// api modules are mocked — no axios traffic.
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import { toast } from 'react-toastify';
+import { createQueryHarness } from './hookTestUtils';
+import { useApproveProposal } from '../admin/use-cases';
+import { proposalsKeys } from '../proposals/use-cases';
+import { lineItemsKeys } from '../lineItems/use-cases';
+import { adminApi } from '../admin/api';
+
+vi.mock('../admin/api', () => ({
+ adminApi: {
+ getDashboard: vi.fn(),
+ updateProposal: vi.fn(),
+ approveProposal: vi.fn(),
+ sendProposal: vi.fn(),
+ reviseProposal: vi.fn(),
+ returnToReview: vi.fn(),
+ generateSuggestions: vi.fn(),
+ getSimilar: vi.fn(),
+ getHistory: vi.fn(),
+ getAudit: vi.fn(),
+ getPdf: vi.fn(),
+ },
+}));
+
+// useSaveProposalWorkspace pulls lineItemsApi directly; mock it so no test
+// path can reach axios.
+vi.mock('../lineItems/api', () => ({
+ lineItemsApi: {
+ getAll: vi.fn(),
+ create: vi.fn(),
+ bulkUpdate: vi.fn(),
+ delete: vi.fn(),
+ },
+}));
+
+vi.mock('react-toastify', () => ({
+ toast: { success: vi.fn(), error: vi.fn(), warning: vi.fn(), info: vi.fn() },
+}));
+
+const PROPOSAL_ID = 'p-7';
+
+beforeEach(() => {
+ vi.clearAllMocks();
+});
+
+describe('useApproveProposal', () => {
+ it('invalidates the proposal detail and its line items keys and toasts on success', async () => {
+ vi.mocked(adminApi.approveProposal).mockResolvedValue(undefined);
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useApproveProposal(PROPOSAL_ID), { wrapper });
+ result.current.mutate();
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ expect(adminApi.approveProposal).toHaveBeenCalledWith(PROPOSAL_ID);
+ // Approval changes proposal status AND locks/reprices line items — both
+ // domains' keys must be refetched (cross-domain invalidation, rule 3).
+ expect(invalidateSpy).toHaveBeenCalledWith({
+ queryKey: proposalsKeys.detail(PROPOSAL_ID),
+ });
+ expect(invalidateSpy).toHaveBeenCalledWith({
+ queryKey: lineItemsKeys.byProposal(PROPOSAL_ID),
+ });
+ expect(toast.success).toHaveBeenCalledWith('Proposal approved');
+ });
+
+ it('toasts the failure and skips invalidation when approval is rejected', async () => {
+ vi.mocked(adminApi.approveProposal).mockRejectedValue(
+ new Error('proposal is not in review')
+ );
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useApproveProposal(PROPOSAL_ID), { wrapper });
+ result.current.mutate();
+
+ await waitFor(() => expect(result.current.isError).toBe(true));
+ expect(toast.error).toHaveBeenCalledWith('Approval failed: proposal is not in review');
+ expect(invalidateSpy).not.toHaveBeenCalled();
+ expect(toast.success).not.toHaveBeenCalled();
+ });
+});
diff --git a/web/src/domain/__tests__/customers.use-cases.test.tsx b/web/src/domain/__tests__/customers.use-cases.test.tsx
new file mode 100644
index 0000000..65b0e66
--- /dev/null
+++ b/web/src/domain/__tests__/customers.use-cases.test.tsx
@@ -0,0 +1,98 @@
+// Customers domain use-case hooks: create/update must invalidate the list
+// key family (customersKeys.lists()) and toast. The domain api module is
+// mocked — no axios traffic.
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import { toast } from 'react-toastify';
+import { createQueryHarness } from './hookTestUtils';
+import {
+ customersKeys,
+ useCreateCustomer,
+ useUpdateCustomer,
+} from '../customers/use-cases';
+import { customersApi } from '../customers/api';
+import type { Customer } from '../customers/types';
+
+vi.mock('../customers/api', () => ({
+ customersApi: {
+ search: vi.fn(),
+ list: vi.fn(),
+ create: vi.fn(),
+ update: vi.fn(),
+ },
+}));
+
+vi.mock('react-toastify', () => ({
+ toast: { success: vi.fn(), error: vi.fn(), warning: vi.fn(), info: vi.fn() },
+}));
+
+const customer = { id: 'c-1', name: 'Acme Corp' } as unknown as Customer;
+
+beforeEach(() => {
+ vi.clearAllMocks();
+});
+
+describe('customersKeys', () => {
+ it('list keys nest under lists() so one invalidation hits every page/filter', () => {
+ expect(customersKeys.all).toEqual(['customers']);
+ expect(customersKeys.lists()).toEqual(['customers', 'list']);
+ expect(customersKeys.list({ page: 3 })).toEqual(['customers', 'list', { page: 3 }]);
+ expect(customersKeys.search('acme')).toEqual(['customers', 'search', 'acme']);
+ });
+});
+
+describe('useCreateCustomer', () => {
+ it('invalidates customersKeys.lists() and toasts on success', async () => {
+ vi.mocked(customersApi.create).mockResolvedValue(customer);
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useCreateCustomer(), { wrapper });
+ result.current.mutate({ name: 'Acme Corp' } as never);
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ expect(invalidateSpy).toHaveBeenCalledWith({ queryKey: customersKeys.lists() });
+ expect(toast.success).toHaveBeenCalledWith('Customer created');
+ });
+
+ it('toasts the failure and skips invalidation', async () => {
+ vi.mocked(customersApi.create).mockRejectedValue(new Error('duplicate name'));
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useCreateCustomer(), { wrapper });
+ result.current.mutate({ name: 'Acme Corp' } as never);
+
+ await waitFor(() => expect(result.current.isError).toBe(true));
+ expect(toast.error).toHaveBeenCalledWith('Failed to create customer: duplicate name');
+ expect(invalidateSpy).not.toHaveBeenCalled();
+ });
+});
+
+describe('useUpdateCustomer', () => {
+ it('passes id + payload through and invalidates customersKeys.lists() on success', async () => {
+ vi.mocked(customersApi.update).mockResolvedValue(customer);
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useUpdateCustomer(), { wrapper });
+ const data = { name: 'Acme Corp (Renamed)' } as never;
+ result.current.mutate({ id: 'c-1', data });
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ expect(customersApi.update).toHaveBeenCalledWith('c-1', data);
+ expect(invalidateSpy).toHaveBeenCalledWith({ queryKey: customersKeys.lists() });
+ expect(toast.success).toHaveBeenCalledWith('Customer updated');
+ });
+
+ it('toasts the failure on update error', async () => {
+ vi.mocked(customersApi.update).mockRejectedValue(new Error('not found'));
+ const { wrapper } = createQueryHarness();
+
+ const { result } = renderHook(() => useUpdateCustomer(), { wrapper });
+ result.current.mutate({ id: 'c-404', data: { name: 'x' } as never });
+
+ await waitFor(() => expect(result.current.isError).toBe(true));
+ expect(toast.error).toHaveBeenCalledWith('Failed to update customer: not found');
+ });
+});
diff --git a/web/src/domain/__tests__/hookTestUtils.tsx b/web/src/domain/__tests__/hookTestUtils.tsx
new file mode 100644
index 0000000..09a4044
--- /dev/null
+++ b/web/src/domain/__tests__/hookTestUtils.tsx
@@ -0,0 +1,18 @@
+// Shared harness for domain use-case hook tests: a fresh QueryClient per
+// test (no retries, so error paths settle immediately) plus the provider
+// wrapper renderHook needs. Not a test file — no .test suffix.
+import type { ReactNode } from 'react';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+
+export function createQueryHarness() {
+ const queryClient = new QueryClient({
+ defaultOptions: {
+ queries: { retry: false },
+ mutations: { retry: false },
+ },
+ });
+ const wrapper = ({ children }: { children: ReactNode }) => (
+ {children}
+ );
+ return { queryClient, wrapper };
+}
diff --git a/web/src/domain/__tests__/lineItems.use-cases.test.tsx b/web/src/domain/__tests__/lineItems.use-cases.test.tsx
new file mode 100644
index 0000000..6b32dfa
--- /dev/null
+++ b/web/src/domain/__tests__/lineItems.use-cases.test.tsx
@@ -0,0 +1,74 @@
+// Line items domain use-case hooks: bulk update must invalidate BOTH the
+// proposal's line-items key and the proposal detail key (totals change).
+// The domain api module is mocked — no axios traffic.
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import { toast } from 'react-toastify';
+import { createQueryHarness } from './hookTestUtils';
+import { lineItemsKeys, useBulkUpdateLineItems } from '../lineItems/use-cases';
+import { proposalsKeys } from '../proposals/use-cases';
+import { lineItemsApi } from '../lineItems/api';
+import type { UpdateLineItemEntry } from '../lineItems/types';
+
+vi.mock('../lineItems/api', () => ({
+ lineItemsApi: {
+ getAll: vi.fn(),
+ create: vi.fn(),
+ bulkUpdate: vi.fn(),
+ delete: vi.fn(),
+ },
+}));
+
+vi.mock('react-toastify', () => ({
+ toast: { success: vi.fn(), error: vi.fn(), warning: vi.fn(), info: vi.fn() },
+}));
+
+const PROPOSAL_ID = 'p-42';
+const entries = [
+ { description: 'Labor', quantity: 2, unitPrice: 150 },
+] as unknown as UpdateLineItemEntry[];
+
+beforeEach(() => {
+ vi.clearAllMocks();
+});
+
+describe('lineItemsKeys', () => {
+ it('scopes the by-proposal key under ["lineItems"]', () => {
+ expect(lineItemsKeys.all).toEqual(['lineItems']);
+ expect(lineItemsKeys.byProposal(PROPOSAL_ID)).toEqual(['lineItems', PROPOSAL_ID]);
+ });
+});
+
+describe('useBulkUpdateLineItems', () => {
+ it('sends the entries and invalidates the proposal line-items + detail keys on success', async () => {
+ vi.mocked(lineItemsApi.bulkUpdate).mockResolvedValue([]);
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useBulkUpdateLineItems(PROPOSAL_ID), { wrapper });
+ result.current.mutate(entries);
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ expect(lineItemsApi.bulkUpdate).toHaveBeenCalledWith(PROPOSAL_ID, entries);
+ expect(invalidateSpy).toHaveBeenCalledWith({
+ queryKey: lineItemsKeys.byProposal(PROPOSAL_ID),
+ });
+ // Totals live on the proposal detail — it must be refetched too.
+ expect(invalidateSpy).toHaveBeenCalledWith({
+ queryKey: proposalsKeys.detail(PROPOSAL_ID),
+ });
+ });
+
+ it('toasts a save failure and skips invalidation', async () => {
+ vi.mocked(lineItemsApi.bulkUpdate).mockRejectedValue(new Error('409 conflict'));
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useBulkUpdateLineItems(PROPOSAL_ID), { wrapper });
+ result.current.mutate(entries);
+
+ await waitFor(() => expect(result.current.isError).toBe(true));
+ expect(toast.error).toHaveBeenCalledWith('Save failed: 409 conflict');
+ expect(invalidateSpy).not.toHaveBeenCalled();
+ });
+});
diff --git a/web/src/domain/__tests__/proposals.use-cases.test.tsx b/web/src/domain/__tests__/proposals.use-cases.test.tsx
new file mode 100644
index 0000000..cc57edf
--- /dev/null
+++ b/web/src/domain/__tests__/proposals.use-cases.test.tsx
@@ -0,0 +1,126 @@
+// Proposals domain use-case hooks: query key shape, list caching under the
+// domain key, and create-mutation invalidation/toast behavior. The domain
+// api module is mocked — no axios traffic.
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import { toast } from 'react-toastify';
+import { createQueryHarness } from './hookTestUtils';
+import {
+ proposalsKeys,
+ useProposals,
+ useCreateProposal,
+} from '../proposals/use-cases';
+import { proposalsApi } from '../proposals/api';
+import type { ProposalDetail, ProposalFilters, ProposalListItem, PagedResponse } from '../proposals/types';
+
+vi.mock('../proposals/api', () => ({
+ proposalsApi: {
+ create: vi.fn(),
+ getAll: vi.fn(),
+ getById: vi.fn(),
+ uploadAttachment: vi.fn(),
+ confirmUpload: vi.fn(),
+ getStats: vi.fn(),
+ getVendors: vi.fn(),
+ },
+}));
+
+vi.mock('react-toastify', () => ({
+ toast: { success: vi.fn(), error: vi.fn(), warning: vi.fn(), info: vi.fn() },
+}));
+
+const proposal = {
+ id: 'p-1',
+ proposalNumber: 'PRO-0001',
+} as unknown as ProposalDetail;
+
+const pagedList: PagedResponse = {
+ items: [],
+ page: 2,
+ pageSize: 25,
+ totalCount: 0,
+} as unknown as PagedResponse;
+
+beforeEach(() => {
+ vi.clearAllMocks();
+});
+
+describe('proposalsKeys', () => {
+ it('follows the hierarchical TanStack key convention rooted at ["proposals"]', () => {
+ expect(proposalsKeys.all).toEqual(['proposals']);
+ expect(proposalsKeys.lists()).toEqual(['proposals', 'list']);
+ expect(proposalsKeys.list({ page: 2, status: 'InReview' })).toEqual([
+ 'proposals',
+ 'list',
+ { page: 2, status: 'InReview' },
+ ]);
+ expect(proposalsKeys.detail('p-1')).toEqual(['proposals', 'p-1']);
+ expect(proposalsKeys.stats()).toEqual(['proposals', 'stats']);
+ expect(proposalsKeys.vendors('p-1')).toEqual(['proposals', 'p-1', 'vendors']);
+ });
+});
+
+describe('useProposals', () => {
+ it('fetches with the given filters and caches under proposalsKeys.list(filters)', async () => {
+ const filters: ProposalFilters = { page: 2, pageSize: 25 };
+ vi.mocked(proposalsApi.getAll).mockResolvedValue(pagedList);
+ const { queryClient, wrapper } = createQueryHarness();
+
+ const { result } = renderHook(() => useProposals(filters), { wrapper });
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ expect(proposalsApi.getAll).toHaveBeenCalledWith(filters);
+ // The data must live under the domain's list key — pages and cross-domain
+ // invalidation both depend on this exact shape.
+ expect(queryClient.getQueryData(proposalsKeys.list(filters))).toBe(pagedList);
+ });
+});
+
+describe('useCreateProposal', () => {
+ it('invalidates proposalsKeys.all and toasts on success', async () => {
+ vi.mocked(proposalsApi.create).mockResolvedValue(proposal);
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useCreateProposal(), { wrapper });
+ result.current.mutate({ request: {} as never });
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ expect(invalidateSpy).toHaveBeenCalledWith({ queryKey: proposalsKeys.all });
+ expect(toast.success).toHaveBeenCalledWith('Proposal PRO-0001 submitted');
+ expect(toast.error).not.toHaveBeenCalled();
+ });
+
+ it('toasts the error message and does not invalidate on failure', async () => {
+ vi.mocked(proposalsApi.create).mockRejectedValue(new Error('boom'));
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useCreateProposal(), { wrapper });
+ result.current.mutate({ request: {} as never });
+
+ await waitFor(() => expect(result.current.isError).toBe(true));
+ expect(toast.error).toHaveBeenCalledWith('boom');
+ expect(invalidateSpy).not.toHaveBeenCalled();
+ });
+
+ it('still succeeds (warning toast, invalidation) when the vendor PDF upload fails', async () => {
+ vi.mocked(proposalsApi.create).mockResolvedValue(proposal);
+ vi.mocked(proposalsApi.uploadAttachment).mockRejectedValue(new Error('presign failed'));
+ const { queryClient, wrapper } = createQueryHarness();
+ const invalidateSpy = vi.spyOn(queryClient, 'invalidateQueries');
+
+ const { result } = renderHook(() => useCreateProposal(), { wrapper });
+ result.current.mutate({
+ request: {} as never,
+ vendorFile: new File(['pdf'], 'vendor.pdf', { type: 'application/pdf' }),
+ });
+
+ await waitFor(() => expect(result.current.isSuccess).toBe(true));
+ // A failed attachment must not fail the proposal creation.
+ expect(proposalsApi.confirmUpload).not.toHaveBeenCalled();
+ expect(toast.warning).toHaveBeenCalledWith(expect.stringContaining('PRO-0001'));
+ expect(invalidateSpy).toHaveBeenCalledWith({ queryKey: proposalsKeys.all });
+ expect(toast.success).toHaveBeenCalledWith('Proposal PRO-0001 submitted');
+ });
+});