diff --git a/packages/core-compat-api/src/convertLegacyPageExtension.test.tsx b/packages/core-compat-api/src/convertLegacyPageExtension.test.tsx
new file mode 100644
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+++ b/packages/core-compat-api/src/convertLegacyPageExtension.test.tsx
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {
+  createPlugin as createLegacyPlugin,
+  createRouteRef as createLegacyRouteRef,
+  createRoutableExtension,
+} from '@backstage/core-plugin-api';
+import { coreExtensionData } from '@backstage/frontend-plugin-api';
+import {
+  createExtensionTester,
+  renderInTestApp,
+} from '@backstage/frontend-test-utils';
+import { screen } from '@testing-library/react';
+import React from 'react';
+import { convertLegacyPageExtension } from './convertLegacyPageExtension';
+import { convertLegacyRouteRef } from './convertLegacyRouteRef';
+
+const routeRef = createLegacyRouteRef({ id: 'test' });
+const legacyPlugin = createLegacyPlugin({
+  id: 'test',
+  routes: {
+    test: routeRef,
+  },
+});
+
+describe('convertLegacyPageExtension', () => {
+  it('should convert a page extension', async () => {
+    const LegacyExtension = legacyPlugin.provide(
+      createRoutableExtension({
+        name: 'ExamplePage',
+        mountPoint: routeRef,
+        component: async () => () => <div>Hello</div>,
+      }),
+    );
+
+    const converted = convertLegacyPageExtension(LegacyExtension);
+    expect(converted.kind).toBe('page');
+    expect(converted.namespace).toBe(undefined);
+    expect(converted.name).toBe('example');
+
+    const tester = createExtensionTester(converted);
+
+    await renderInTestApp(tester.reactElement(), {
+      mountedRoutes: {
+        '/': convertLegacyRouteRef(routeRef),
+      },
+    });
+
+    await expect(screen.findByText('Hello')).resolves.toBeInTheDocument();
+
+    expect(tester.get(coreExtensionData.routePath)).toBe('/example');
+    expect(tester.get(coreExtensionData.routeRef)).toBe(routeRef);
+  });
+
+  it('should convert a page extension with overrides', async () => {
+    const LegacyExtension = legacyPlugin.provide(
+      createRoutableExtension({
+        name: 'ExamplePage',
+        mountPoint: routeRef,
+        component: async () => () => <div>Hello</div>,
+      }),
+    );
+
+    const converted = convertLegacyPageExtension(LegacyExtension, {
+      name: 'other',
+      defaultPath: '/other',
+    });
+    expect(converted.kind).toBe('page');
+    expect(converted.namespace).toBe(undefined);
+    expect(converted.name).toBe('other');
+
+    const tester = createExtensionTester(converted);
+
+    await renderInTestApp(tester.reactElement(), {
+      mountedRoutes: {
+        '/': convertLegacyRouteRef(routeRef),
+      },
+    });
+
+    await expect(screen.findByText('Hello')).resolves.toBeInTheDocument();
+
+    expect(tester.get(coreExtensionData.routePath)).toBe('/other');
+    expect(tester.get(coreExtensionData.routeRef)).toBe(routeRef);
+  });
+});