DashboardLinks: Fixes crash when link has no title (#31008)

* DashboardLinks: Fixes crash when link misses title

* Chore: updates after PR comments

packages/grafana-ui/src/components/DataLinks/DataLinksInlineEditor/DataLinksListItem.test.tsx

+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import { DataLinksListItem, DataLinksListItemProps } from './DataLinksListItem';
+
+const baseLink = {
+  url: '',
+  title: '',
+  onBuildUrl: jest.fn(),
+  onClick: jest.fn(),
+};
+
+function setupTestContext(options: Partial<DataLinksListItemProps>) {
+  const defaults: DataLinksListItemProps = {
+    index: 0,
+    link: baseLink,
+    data: [],
+    onChange: jest.fn(),
+    onEdit: jest.fn(),
+    onRemove: jest.fn(),
+    suggestions: [],
+  };
+
+  const props = { ...defaults, ...options };
+  const { rerender } = render(<DataLinksListItem {...props} />);
+
+  return { rerender, props };
+}
+
+describe('DataLinksListItem', () => {
+  describe('when link has title', () => {
+    it('then the link title should be visible', () => {
+      const link = {
+        ...baseLink,
+        title: 'Some Data Link Title',
+      };
+      setupTestContext({ link });
+
+      expect(screen.getByText(/some data link title/i)).toBeInTheDocument();
+    });
+  });
+
+  describe('when link has url', () => {
+    it('then the link url should be visible', () => {
+      const link = {
+        ...baseLink,
+        url: 'http://localhost:3000',
+      };
+      setupTestContext({ link });
+
+      expect(screen.getByText(/http:\/\/localhost\:3000/i)).toBeInTheDocument();
+      expect(screen.getByTitle(/http:\/\/localhost\:3000/i)).toBeInTheDocument();
+    });
+  });
+
+  describe('when link is missing title', () => {
+    it('then the link title should be replaced by [Data link title not provided]', () => {
+      const link = {
+        ...baseLink,
+        title: (undefined as unknown) as string,
+      };
+      setupTestContext({ link });
+
+      expect(screen.getByText(/data link title not provided/i)).toBeInTheDocument();
+    });
+  });
+
+  describe('when link is missing url', () => {
+    it('then the link url should be replaced by [Data link url not provided]', () => {
+      const link = {
+        ...baseLink,
+        url: (undefined as unknown) as string,
+      };
+      setupTestContext({ link });
+
+      expect(screen.getByText(/data link url not provided/i)).toBeInTheDocument();
+      expect(screen.getByTitle('')).toBeInTheDocument();
+    });
+  });
+
+  describe('when link title is empty', () => {
+    it('then the link title should be replaced by [Data link title not provided]', () => {
+      const link = {
+        ...baseLink,
+        title: '             ',
+      };
+      setupTestContext({ link });
+
+      expect(screen.getByText(/data link title not provided/i)).toBeInTheDocument();
+    });
+  });
+
+  describe('when link url is empty', () => {
+    it('then the link url should be replaced by [Data link url not provided]', () => {
+      const link = {
+        ...baseLink,
+        url: '             ',
+      };
+      setupTestContext({ link });
+
+      expect(screen.getByText(/data link url not provided/i)).toBeInTheDocument();
+      expect(screen.getByTitle('')).toBeInTheDocument();
+    });
+  });
+});

packages/grafana-ui/src/components/DataLinks/DataLinksInlineEditor/DataLinksListItem.tsx

@@ -5,7 +5,7 @@ import { stylesFactory, useTheme } from '../../../themes';
 import { HorizontalGroup, VerticalGroup } from '../../Layout/Layout';
 import { IconButton } from '../../IconButton/IconButton';
 
-interface DataLinksListItemProps {
+export interface DataLinksListItemProps {
   index: number;
   link: DataLink;
   data: DataFrame[];
@@ -19,24 +19,25 @@ interface DataLinksListItemProps {
 export const DataLinksListItem: FC<DataLinksListItemProps> = ({ link, onEdit, onRemove }) => {
   const theme = useTheme();
   const styles = getDataLinkListItemStyles(theme);
+  const { title = '', url = '' } = link;
 
-  const hasTitle = link.title.trim() !== '';
-  const hasUrl = link.url.trim() !== '';
+  const hasTitle = title.trim() !== '';
+  const hasUrl = url.trim() !== '';
 
   return (
     <div className={styles.wrapper}>
       <VerticalGroup spacing="xs">
         <HorizontalGroup justify="space-between" align="flex-start" width="100%">
           <div className={cx(styles.title, !hasTitle && styles.notConfigured)}>
-            {hasTitle ? link.title : 'Data link title not provided'}
+            {hasTitle ? title : 'Data link title not provided'}
           </div>
           <HorizontalGroup>
             <IconButton name="pen" onClick={onEdit} />
             <IconButton name="times" onClick={onRemove} />
           </HorizontalGroup>
         </HorizontalGroup>
-        <div className={cx(styles.url, !hasUrl && styles.notConfigured)} title={link.url}>
-          {hasUrl ? link.url : 'Data link url not provided'}
+        <div className={cx(styles.url, !hasUrl && styles.notConfigured)} title={url}>
+          {hasUrl ? url : 'Data link url not provided'}
         </div>
       </VerticalGroup>
     </div>