diff --git a/packages/grid/x-data-grid-premium/src/tests/exportExcel.DataGridPremium.test.tsx b/packages/grid/x-data-grid-premium/src/tests/exportExcel.DataGridPremium.test.tsx
index f07fee77575d..404c90c23749 100644
--- a/packages/grid/x-data-grid-premium/src/tests/exportExcel.DataGridPremium.test.tsx
+++ b/packages/grid/x-data-grid-premium/src/tests/exportExcel.DataGridPremium.test.tsx
@@ -16,7 +16,7 @@ import { spyApi } from 'test/utils/helperFn';
 
 const isJSDOM = /jsdom/.test(window.navigator.userAgent);
 
-describe('<DataGridPremium /> - Export excel', () => {
+describe('<DataGridPremium /> - Export Excel', () => {
   const { render } = createRenderer({ clock: 'fake' });
 
   let apiRef: React.MutableRefObject<GridApi>;
diff --git a/packages/grid/x-data-grid/src/tests/layout.DataGrid.test.tsx b/packages/grid/x-data-grid/src/tests/layout.DataGrid.test.tsx
index beef362fdc6d..a4ea76ef2107 100644
--- a/packages/grid/x-data-grid/src/tests/layout.DataGrid.test.tsx
+++ b/packages/grid/x-data-grid/src/tests/layout.DataGrid.test.tsx
@@ -35,7 +35,7 @@ describe('<DataGrid /> - Layout & warnings', () => {
     columns: [{ field: 'brand' }],
   };
 
-  describe('Immutable rows', () => {
+  describe('immutable rows', () => {
     it('should throw an error if rows props is being mutated', () => {
       expect(() => {
         // We don't want to freeze baselineProps.rows