diff --git a/x-pack/plugins/transform/public/app/__mocks__/app_dependencies.tsx b/x-pack/plugins/transform/public/app/__mocks__/app_dependencies.tsx
index cdb159c158d10..49bd43232c9f5 100644
--- a/x-pack/plugins/transform/public/app/__mocks__/app_dependencies.tsx
+++ b/x-pack/plugins/transform/public/app/__mocks__/app_dependencies.tsx
@@ -67,7 +67,14 @@ dataStart.search.search = jest.fn(({ params }: IKibanaSearchRequest) => {
 }) as ISearchGeneric;
 
 // Replace mock to support tests for `use_index_data`.
-coreSetup.http.post = jest.fn().mockResolvedValue([]);
+coreSetup.http.post = jest.fn().mockImplementation((endpoint) => {
+  if (endpoint === '/internal/transform/transforms/_preview') {
+    return Promise.resolve({
+      generated_dest_index: { mappings: { properties: {} } },
+      preview: [],
+    });
+  }
+});
 
 const appDependencies: AppDependencies = {
   analytics: coreStart.analytics,
diff --git a/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_summary.test.tsx b/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_summary.test.tsx
index 5b6e314e951aa..7c08a2462f65a 100644
--- a/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_summary.test.tsx
+++ b/x-pack/plugins/transform/public/app/sections/create_transform/components/step_define/step_define_summary.test.tsx
@@ -20,9 +20,7 @@ import { StepDefineSummary } from './step_define_summary';
 
 jest.mock('../../../../app_dependencies');
 
-// Failing: https://github.com/elastic/kibana/issues/195992
-describe.skip('Transform: <DefinePivotSummary />', () => {
-  // Using the async/await wait()/done() pattern to avoid act() errors.
+describe('Transform: <DefinePivotSummary />', () => {
   test('Minimal initialization', async () => {
     // Arrange
     const queryClient = new QueryClient();