Fix breadcrumb tests

Author: alex-page

polaris-react/src/components/Page/components/Header/tests/Header.test.tsx

@@ -67,10 +67,10 @@ describe('<Header />', () => {
         url: 'https://www.google.com',
       };
       const header = mountWithApp(
-        <Header {...mockProps} breadcrumbs={breadcrumb} />,
+        <Header {...mockProps} breadcrumb={breadcrumb} />,
       );
       expect(header).toContainReactComponent(Breadcrumbs, {
-        breadcrumbs: breadcrumb,
+        breadcrumb,
       });
     });
 

polaris-react/src/components/Page/tests/Page.test.tsx

@@ -247,12 +247,12 @@ describe('<Page />', () => {
     });
 
     it('renders a <Header /> when defined not as an array', () => {
-      const breadcrumbs = {
+      const breadcrumb = {
         content: 'Products',
         onAction: noop,
       };
       const page = mountWithApp(
-        <Page {...mockProps} breadcrumbs={breadcrumbs} />,
+        <Page {...mockProps} breadcrumb={breadcrumb} />,
       );
       expect(page).toContainReactComponent(Header);
     });