added two unit tests

Author: Mash707

Diff for: packages/react-core/src/components/Nav/__tests__/Generated/__snapshots__/NavExpandable.test.tsx.snap

@@ -39,6 +39,7 @@ exports[`NavExpandable should match snapshot (auto-generated) 1`] = `
       aria-labelledby="''"
       class="pf-v6-c-nav__subnav"
       hidden=""
+      inert=""
     >
       <h2
         class="pf-v6-screen-reader"

Diff for: packages/react-core/src/components/Nav/__tests__/NavExpandable.test.tsx

@@ -0,0 +1,60 @@
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import '@testing-library/jest-dom';
+import { NavExpandable } from '../NavExpandable';
+import { NavItem } from '../NavItem';
+import { Nav, NavContext } from '../Nav';
+import { NavList } from '../NavList';
+
+const props = {
+  items: [
+    { to: '#link1', label: 'Link 1' },
+    { to: '#link2', label: 'Link 2' },
+    { to: '#link3', label: 'Link 3' }
+  ]
+};
+
+describe('NavExpandable', () => {
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+
+  test('check that inert is on the section element by default', () => {
+    render(
+      <Nav onSelect={jest.fn()} onToggle={jest.fn()}>
+        <NavList>
+          <NavExpandable id="grp-1" title="Expandable group" data-testid="test-id">
+            {props.items.map((item) => (
+              <NavItem to={item.to} key={item.to}>
+                {item.label}
+              </NavItem>
+            ))}
+          </NavExpandable>
+        </NavList>
+      </Nav>
+    );
+    const wrapper = screen.getByTestId('test-id');
+    const section = wrapper.querySelector('.pf-v6-c-nav__subnav');
+    expect(section).toHaveAttribute('inert', '');
+  });
+
+  test('check that inert is NOT on the section when isExpanded is true', () => {
+    render(
+      <Nav onSelect={jest.fn()} onToggle={jest.fn()}>
+        <NavList>
+          <NavExpandable id="grp-1" title="Expandable group" isExpanded={true} data-testid="test-id">
+            {props.items.map((item) => (
+              <NavItem to={item.to} key={item.to}>
+                {item.label}
+              </NavItem>
+            ))}
+          </NavExpandable>
+        </NavList>
+      </Nav>
+    );
+
+    const wrapper = screen.getByTestId('test-id');
+    const section = wrapper.querySelector('.pf-v6-c-nav__subnav');
+    expect(section).not.toHaveAttribute('inert', '');
+  });
+});

Diff for: packages/react-core/src/components/Nav/__tests__/__snapshots__/Nav.test.tsx.snap

@@ -223,6 +223,7 @@ exports[`Nav Expandable Nav List - Trigger toggle 1`] = `
           aria-labelledby="grp-1"
           class="pf-v6-c-nav__subnav"
           hidden=""
+          inert=""
         >
           <ul
             class="pf-v6-c-nav__list"
@@ -355,6 +356,7 @@ exports[`Nav Expandable Nav List 1`] = `
           aria-labelledby="grp-1"
           class="pf-v6-c-nav__subnav"
           hidden=""
+          inert=""
         >
           <ul
             class="pf-v6-c-nav__list"
@@ -486,6 +488,7 @@ exports[`Nav Expandable Nav List with aria label 1`] = `
           aria-labelledby="grp-1"
           class="pf-v6-c-nav__subnav"
           hidden=""
+          inert=""
         >
           <h2
             class="pf-v6-screen-reader"