test(588): add tests for InvoiceListSentinel observer cleanup, InvoiceExportButton spinner, LineItemRow component, and InvoiceTimeline animation

Author: lolandriley-wq

src/__tests__/InvoiceExportButton.test.tsx

@@ -0,0 +1,139 @@
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import InvoiceExportButton from '@/components/InvoiceExportButton';
+import type { Invoice } from '@stellar-split/sdk';
+
+// Mock the dynamic PDF import
+jest.mock('@react-pdf/renderer', () => ({
+  pdf: jest.fn(() => ({
+    toBlob: jest.fn(async () => new Blob(['test'])),
+  })),
+  Document: jest.fn(() => null),
+  Page: jest.fn(() => null),
+  Text: jest.fn(() => null),
+  View: jest.fn(() => null),
+  StyleSheet: { create: jest.fn((obj) => obj) },
+  Image: jest.fn(() => null),
+}));
+
+jest.mock('@/lib/branding', () => ({
+  fetchBrandSettings: jest.fn(async () => ({})),
+}));
+
+describe('InvoiceExportButton', () => {
+  const mockInvoice: Invoice = {
+    id: 'test-id',
+    creator: 'GTEST',
+    recipients: [
+      { address: 'GRECIPIENT', amount: 100n },
+    ],
+    payments: [],
+    status: 'Pending',
+    funded: 0n,
+    token: 'USDC',
+    deadline: 0,
+  };
+
+  beforeEach(() => {
+    global.URL.createObjectURL = jest.fn(() => 'blob:test');
+    global.URL.revokeObjectURL = jest.fn();
+    HTMLAnchorElement.prototype.click = jest.fn();
+
+    jest.spyOn(global, 'fetch').mockResolvedValue({
+      ok: true,
+      json: async () => ({}),
+    } as any);
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should render the export button', () => {
+    render(
+      <InvoiceExportButton
+        invoice={mockInvoice}
+        total={100n}
+      />
+    );
+
+    expect(screen.getByRole('button', { name: /export pdf/i })).toBeInTheDocument();
+  });
+
+  it('should be enabled initially', () => {
+    render(
+      <InvoiceExportButton
+        invoice={mockInvoice}
+        total={100n}
+      />
+    );
+
+    const button = screen.getByRole('button', { name: /export pdf/i });
+    expect(button).not.toBeDisabled();
+  });
+
+  it('should be disabled while export is in progress', async () => {
+    render(
+      <InvoiceExportButton
+        invoice={mockInvoice}
+        total={100n}
+      />
+    );
+
+    const button = screen.getByRole('button', { name: /export pdf/i });
+    fireEvent.click(button);
+
+    await waitFor(() => {
+      expect(button).toBeDisabled();
+    });
+  });
+
+  it('should show spinner icon while loading', async () => {
+    render(
+      <InvoiceExportButton
+        invoice={mockInvoice}
+        total={100n}
+      />
+    );
+
+    const button = screen.getByRole('button', { name: /export pdf/i });
+    fireEvent.click(button);
+
+    await waitFor(() => {
+      const spinner = button.querySelector('svg.animate-spin');
+      expect(spinner).toBeInTheDocument();
+    });
+  });
+
+  it('should show generating text while loading', async () => {
+    render(
+      <InvoiceExportButton
+        invoice={mockInvoice}
+        total={100n}
+      />
+    );
+
+    const button = screen.getByRole('button', { name: /export pdf/i });
+    fireEvent.click(button);
+
+    await waitFor(() => {
+      expect(button).toHaveTextContent('Generating…');
+    });
+  });
+
+  it('should return to normal state after export completes', async () => {
+    render(
+      <InvoiceExportButton
+        invoice={mockInvoice}
+        total={100n}
+      />
+    );
+
+    const button = screen.getByRole('button', { name: /export pdf/i });
+    fireEvent.click(button);
+
+    await waitFor(() => {
+      expect(button).not.toBeDisabled();
+      expect(button).toHaveTextContent('Export PDF');
+    });
+  });
+});

src/__tests__/InvoiceListSentinel.test.tsx

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+import { render, screen, waitFor } from '@testing-library/react';
+import InvoiceListSentinel from '@/components/InvoiceListSentinel';
+
+describe('InvoiceListSentinel', () => {
+  let observerMock: { observe: jest.Mock; disconnect: jest.Mock; unobserve: jest.Mock };
+  let IntersectionObserverMock: jest.Mock;
+
+  beforeEach(() => {
+    observerMock = {
+      observe: jest.fn(),
+      disconnect: jest.fn(),
+      unobserve: jest.fn(),
+    };
+
+    IntersectionObserverMock = jest.fn(() => observerMock);
+    (global as any).IntersectionObserver = IntersectionObserverMock;
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should create an IntersectionObserver on mount', () => {
+    const mockOnVisible = jest.fn();
+    render(
+      <InvoiceListSentinel
+        onVisible={mockOnVisible}
+        loading={false}
+        allLoaded={false}
+      />
+    );
+
+    expect(IntersectionObserverMock).toHaveBeenCalled();
+    expect(observerMock.observe).toHaveBeenCalled();
+  });
+
+  it('should disconnect the IntersectionObserver on unmount', () => {
+    const mockOnVisible = jest.fn();
+    const { unmount } = render(
+      <InvoiceListSentinel
+        onVisible={mockOnVisible}
+        loading={false}
+        allLoaded={false}
+      />
+    );
+
+    unmount();
+
+    expect(observerMock.disconnect).toHaveBeenCalled();
+  });
+
+  it('should call onVisible when intersection is detected', () => {
+    const mockOnVisible = jest.fn();
+    IntersectionObserverMock.mockImplementation((callback) => {
+      setTimeout(() => {
+        callback([{ isIntersecting: true }] as any);
+      }, 0);
+      return observerMock;
+    });
+
+    render(
+      <InvoiceListSentinel
+        onVisible={mockOnVisible}
+        loading={false}
+        allLoaded={false}
+      />
+    );
+
+    waitFor(() => {
+      expect(mockOnVisible).toHaveBeenCalled();
+    });
+  });
+
+  it('should display loading spinner when loading is true', () => {
+    const mockOnVisible = jest.fn();
+    render(
+      <InvoiceListSentinel
+        onVisible={mockOnVisible}
+        loading={true}
+        allLoaded={false}
+      />
+    );
+
+    expect(screen.getByText('Loading more invoices…')).toBeInTheDocument();
+  });
+
+  it('should display all loaded message when allLoaded is true', () => {
+    const mockOnVisible = jest.fn();
+    render(
+      <InvoiceListSentinel
+        onVisible={mockOnVisible}
+        loading={false}
+        allLoaded={true}
+      />
+    );
+
+    expect(screen.getByText('All invoices loaded')).toBeInTheDocument();
+  });
+
+  it('should pass custom rootMargin to IntersectionObserver', () => {
+    const mockOnVisible = jest.fn();
+    const customMargin = '500px';
+
+    render(
+      <InvoiceListSentinel
+        onVisible={mockOnVisible}
+        loading={false}
+        allLoaded={false}
+        rootMargin={customMargin}
+      />
+    );
+
+    const callArgs = IntersectionObserverMock.mock.calls[0];
+    expect(callArgs[1]).toEqual({ rootMargin: customMargin });
+  });
+});