Extract `ExportAnnotations` component

- Add basic tests

src/sidebar/components/ShareDialog/ExportAnnotations.tsx

+import { Button, CardActions, Input } from '@hypothesis/frontend-shared';
+
+import { useSidebarStore } from '../../store';
+import LoadingSpinner from './LoadingSpinner';
+
+/**
+ * Render content for "export" tab panel
+ */
+export default function ExportAnnotations() {
+  const store = useSidebarStore();
+  const group = store.focusedGroup();
+  const exportReady = group && !store.isLoading();
+  const annotations = store.allAnnotations();
+
+  if (!exportReady) {
+    return <LoadingSpinner />;
+  }
+
+  // TODO: Handle 0 annotations
+  return (
+    <>
+      <p>
+        Export <strong>{annotations.length} annotations</strong> in a file
+        named:
+      </p>
+      <Input id="export-filename" value="filename-tbd-export.json" />
+      <CardActions>
+        <Button variant="primary" disabled>
+          Export
+        </Button>
+      </CardActions>
+    </>
+  );
+}

src/sidebar/components/ShareDialog/ShareDialog.tsx

 import {
-  Button,
   Card,
-  CardActions,
   CopyIcon,
   IconButton,
   Input,
@@ -18,6 +16,7 @@ import { useSidebarStore } from '../../store';
 import { copyText } from '../../util/copy-to-clipboard';
 import ShareLinks from '../ShareLinks';
 import SidebarPanel from '../SidebarPanel';
+import ExportAnnotations from './ExportAnnotations';
 import LoadingSpinner from './LoadingSpinner';
 import TabHeader from './TabHeader';
 import TabPanel from './TabPanel';
@@ -110,38 +109,6 @@ function SharePanelContent({
   );
 }
 
-type ExportPanelContentProps = {
-  loading: boolean;
-  annotationCount: number;
-};
-
-/**
- * Render content for "export" tab panel
- */
-function ExportPanelContent({
-  loading,
-  annotationCount,
-}: ExportPanelContentProps) {
-  if (loading) {
-    return <LoadingSpinner />;
-  }
-
-  // TODO: Handle 0 annotations
-  return (
-    <>
-      <p>
-        Export <strong>{annotationCount} annotations</strong> in a file named:
-      </p>
-      <Input id="export-filename" value="filename-tbd-export.json" />
-      <CardActions>
-        <Button variant="primary" disabled>
-          Export
-        </Button>
-      </CardActions>
-    </>
-  );
-}
-
 export type ShareDialogProps = {
   // injected
   toastMessenger: ToastMessengerService;
@@ -160,7 +127,6 @@ function ShareDialog({ toastMessenger }: ShareDialogProps) {
   const focusedGroup = store.focusedGroup();
   const groupName = (focusedGroup && focusedGroup.name) || '...';
   const panelTitle = `Share Annotations in ${groupName}`;
-  const allAnnotations = store.allAnnotations();
 
   const tabbedDialog = store.isFeatureEnabled('export_annotations');
   const [selectedTab, setSelectedTab] = useState<'share' | 'export'>('share');
@@ -169,7 +135,6 @@ function ShareDialog({ toastMessenger }: ShareDialogProps) {
   // be available
   const sharingReady = focusedGroup && mainFrame;
   // Show a loading spinner in the export tab if annotations are loading
-  const exportReady = focusedGroup && !store.isLoading();
 
   const shareURI =
     sharingReady && pageSharingLink(mainFrame.uri, focusedGroup.id);
@@ -237,10 +202,7 @@ function ShareDialog({ toastMessenger }: ShareDialogProps) {
               aria-labelledby="export-panel-tab"
               title={`Export from ${focusedGroup?.name ?? '...'}`}
             >
-              <ExportPanelContent
-                annotationCount={allAnnotations.length}
-                loading={!exportReady}
-              />
+              <ExportAnnotations />
             </TabPanel>
           </Card>
         </>

src/sidebar/components/ShareDialog/test/ExportAnnotations-test.js

+import { mount } from 'enzyme';
+
+import { checkAccessibility } from '../../../../test-util/accessibility';
+import { mockImportedComponents } from '../../../../test-util/mock-imported-components';
+import ExportAnnotations from '../ExportAnnotations';
+import { $imports } from '../ExportAnnotations';
+
+describe('ExportAnnotations', () => {
+  let fakeStore;
+
+  const fakePrivateGroup = {
+    type: 'private',
+    name: 'Test Private Group',
+    id: 'testprivate',
+  };
+
+  const createComponent = props => mount(<ExportAnnotations {...props} />);
+
+  beforeEach(() => {
+    fakeStore = {
+      allAnnotations: sinon.stub().returns(0),
+      focusedGroup: sinon.stub().returns(fakePrivateGroup),
+      isLoading: sinon.stub().returns(false),
+    };
+
+    $imports.$mock(mockImportedComponents());
+
+    $imports.$mock({
+      '../../store': { useSidebarStore: () => fakeStore },
+    });
+  });
+
+  afterEach(() => {
+    $imports.$restore();
+  });
+
+  context('export annotations not ready', () => {
+    it('renders a loading spinner if there is no focused group', () => {
+      fakeStore.focusedGroup.returns(null);
+
+      const wrapper = createComponent();
+
+      assert.isTrue(wrapper.find('LoadingSpinner').exists());
+    });
+
+    it('renders a loading spinner if annotations are loading', () => {
+      fakeStore.isLoading.returns(true);
+
+      const wrapper = createComponent();
+
+      assert.isTrue(wrapper.find('LoadingSpinner').exists());
+    });
+  });
+
+  it('provides a filename field', () => {
+    // TODO expand as component logic is implemented
+    const wrapper = createComponent();
+
+    assert.isTrue(wrapper.find('Input').exists());
+  });
+
+  it(
+    'should pass a11y checks',
+    checkAccessibility({
+      content: () => createComponent(),
+    })
+  );
+});

src/sidebar/components/ShareDialog/test/ShareDialog-test.js

@@ -45,7 +45,7 @@ describe('ShareDialog', () => {
     };
 
     $imports.$mock(mockImportedComponents());
-    // Don't mock these simple components for now
+    // Don't mock these related components for now
     $imports.$restore({
       './LoadingSpinner': true,
       './TabHeader': true,
@@ -246,7 +246,6 @@ describe('ShareDialog', () => {
           .find('TabPanel')
           .filter({ active: true });
         assert.equal(activeTabPanel.props().id, 'export-panel');
-        assert.isTrue(activeTabPanel.find('Input').exists());
 
         // Now, reselect share tab
         act(() => {
@@ -260,29 +259,6 @@ describe('ShareDialog', () => {
         const shareTabPanel = wrapper.find('TabPanel').filter({ active: true });
         assert.equal(shareTabPanel.props().id, 'share-panel');
       });
-
-      it('shows a loading indicator on the export tab if not ready', () => {
-        const wrapper = createComponent();
-        const exportTabSelector = 'Tab[aria-controls="export-panel"]';
-        fakeStore.isLoading.returns(true);
-
-        act(() => {
-          wrapper
-            .find(exportTabSelector)
-            .getDOMNode()
-            .dispatchEvent(new Event('click'));
-        });
-        wrapper.update();
-
-        const activeTabPanel = wrapper
-          .find('TabPanel')
-          .filter({ active: true });
-        assert.equal(activeTabPanel.props().id, 'export-panel');
-        assert.isFalse(activeTabPanel.find('Input').exists());
-        assert.isTrue(
-          activeTabPanel.find('[data-testid="loading-spinner"]').exists()
-        );
-      });
     });
   });