diff --git a/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.test.tsx b/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.test.tsx
new file mode 100644
index 0000000000..54a8e17ca2
--- /dev/null
+++ b/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.test.tsx
@@ -0,0 +1,72 @@
+import { screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { vi } from 'vitest';
+import { MarkCompletedDialogue } from './MarkCompletedDialogue';
+import { render } from 'utils/testRenderer';
+import {
+    testServerRoute,
+    testServerSetup,
+} from '../../../../../utils/testServer';
+
+const defaultProps = {
+    isOpen: true,
+    setIsOpen: vi.fn(),
+    onComplete: vi.fn(),
+    projectId: 'project1',
+    featureId: 'feature1',
+};
+
+const server = testServerSetup();
+
+const setup = (props = defaultProps) => {
+    testServerRoute(
+        server,
+        `/api/admin/projects/${defaultProps.projectId}/features/${defaultProps.featureId}/parent-variants`,
+        ['fard'],
+    );
+
+    render(<MarkCompletedDialogue {...props} />);
+};
+
+test('dialog opens correctly and can be closed', async () => {
+    const { setIsOpen } = defaultProps;
+    setup();
+
+    expect(screen.getByText('Mark completed')).toBeInTheDocument();
+    userEvent.click(screen.getByText('Cancel'));
+    expect(setIsOpen).toHaveBeenCalledWith(false);
+});
+
+test('selecting options updates state appropriately', async () => {
+    setup();
+
+    const radioKept = screen.getByLabelText('We decided to keep the feature');
+    userEvent.click(radioKept);
+    expect(radioKept).toBeChecked();
+
+    const radioDiscarded = screen.getByLabelText(
+        'We decided to discard the feature',
+    );
+    userEvent.click(radioDiscarded);
+    expect(radioDiscarded).toBeChecked();
+
+    const radioVariant = screen.getByLabelText(
+        'We decided to keep the feature variant',
+    );
+    userEvent.click(radioVariant);
+    expect(radioVariant).toBeChecked();
+});
+
+test('variant selection is shown when appropriate', async () => {
+    setup();
+
+    userEvent.click(
+        screen.getByLabelText('We decided to keep the feature variant'),
+    );
+
+    expect(
+        screen.getByText(
+            'Choose to specify which feature variant will be kept',
+        ),
+    ).toBeInTheDocument();
+});
diff --git a/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.tsx b/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.tsx
index 297392b92b..a5e878f1e2 100644
--- a/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.tsx
+++ b/frontend/src/component/feature/FeatureView/FeatureOverview/FeatureLifecycle/MarkCompletedDialogue.tsx
@@ -44,7 +44,7 @@ export const MarkCompletedDialogue = ({
     return (
         <Dialogue
             open={isOpen}
-            title='Mark completed'
+            title='Mark flag completed'
             onClose={() => {
                 setIsOpen(false);
             }}