diff --git a/website/src/components/SearchPage/fields/AutoCompleteField.spec.tsx b/website/src/components/SearchPage/fields/AutoCompleteField.spec.tsx
new file mode 100644
index 000000000..1510ea6e6
--- /dev/null
+++ b/website/src/components/SearchPage/fields/AutoCompleteField.spec.tsx
@@ -0,0 +1,208 @@
+import { render, screen, fireEvent } from '@testing-library/react';
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+
+import { AutoCompleteField } from './AutoCompleteField';
+import { lapisClientHooks } from '../../../services/serviceHooks.ts';
+import { type MetadataFilter } from '../../../types/config.ts';
+
+vi.mock('../../../services/serviceHooks.ts');
+vi.mock('../../../clientLogger.ts', () => ({
+    getClientLogger: () => ({
+        error: vi.fn(),
+    }),
+}));
+
+const mockUseAggregated = vi.fn();
+// @ts-expect-error because mockReturnValue is not defined in the type definition
+lapisClientHooks.mockReturnValue({
+    zodiosHooks: {
+        useAggregated: mockUseAggregated,
+    },
+});
+
+describe('AutoCompleteField', () => {
+    const field: MetadataFilter = {
+        name: 'testField',
+        label: 'Test Field',
+        type: 'string',
+        autocomplete: true,
+    };
+    const setAFieldValue = vi.fn();
+    const lapisUrl = 'https://example.com/api';
+    const lapisSearchParameters = { param1: 'value1' };
+
+    beforeEach(() => {
+        setAFieldValue.mockClear();
+    });
+
+    it('renders input and shows all all options on empty input', async () => {
+        mockUseAggregated.mockReturnValue({
+            data: {
+                data: [
+                    { testField: 'Option 1', count: 10 },
+                    { testField: 'Option 2', count: 20 },
+                ],
+            },
+            isLoading: false,
+            error: null,
+            mutate: vi.fn(),
+        });
+
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        expect(input).toBeInTheDocument();
+
+        fireEvent.focus(input);
+
+        const options = await screen.findAllByRole('option');
+        expect(options).toHaveLength(2);
+        expect(options[0]).toHaveTextContent('Option 1(10)');
+        expect(options[1]).toHaveTextContent('Option 2(20)');
+    });
+
+    it('filters options based on query', async () => {
+        mockUseAggregated.mockReturnValue({
+            data: {
+                data: [
+                    { testField: 'Option 1', count: 10 },
+                    { testField: 'Option 2', count: 20 },
+                ],
+            },
+            isLoading: false,
+            error: null,
+            mutate: vi.fn(),
+        });
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        fireEvent.focus(input);
+
+        fireEvent.change(input, { target: { value: 'Option 2' } });
+
+        const options = await screen.findAllByRole('option');
+        expect(options).toHaveLength(1);
+        expect(options[0]).toHaveTextContent('Option 2(20)');
+    });
+
+    it('displays loading state when aggregated endpoint is in isLoading state', () => {
+        mockUseAggregated.mockReturnValueOnce({
+            data: null,
+            isLoading: true,
+            error: null,
+            mutate: vi.fn(),
+        });
+
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        fireEvent.focus(input);
+
+        expect(screen.getByText('Loading...')).toBeInTheDocument();
+    });
+
+    it('displays error message when aggregated returns an error', () => {
+        mockUseAggregated.mockReturnValueOnce({
+            data: null,
+            isLoading: false,
+            error: { message: 'Error message', stack: 'Error stack' },
+            mutate: vi.fn(),
+        });
+
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        fireEvent.focus(input);
+
+        expect(screen.getByText('No options available')).toBeInTheDocument();
+    });
+
+    it('calls setAFieldValue, when an option is selected', async () => {
+        mockUseAggregated.mockReturnValue({
+            data: {
+                data: [
+                    { testField: 'Option 1', count: 10 },
+                    { testField: 'Option 2', count: 20 },
+                ],
+            },
+            isLoading: false,
+            error: null,
+            mutate: vi.fn(),
+        });
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        fireEvent.focus(input);
+
+        const options = await screen.findAllByRole('option');
+        fireEvent.click(options[0]);
+
+        expect(setAFieldValue).toHaveBeenCalledWith('testField', 'Option 1');
+    });
+
+    it('clears input value on clear button click', async () => {
+        mockUseAggregated.mockReturnValue({
+            data: {
+                data: [
+                    { testField: 'Option 1', count: 10 },
+                    { testField: 'Option 2', count: 20 },
+                ],
+            },
+            isLoading: false,
+            error: null,
+            mutate: vi.fn(),
+        });
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                fieldValue='Option 1'
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        fireEvent.focus(input);
+
+        const clearButton = screen.getByLabelText('Clear');
+        fireEvent.click(clearButton);
+
+        expect(setAFieldValue).toHaveBeenCalledWith('testField', '');
+    });
+});
diff --git a/website/src/components/SearchPage/fields/AutoCompleteField.tsx b/website/src/components/SearchPage/fields/AutoCompleteField.tsx
index 9d71fd81b..25b7a1299 100644
--- a/website/src/components/SearchPage/fields/AutoCompleteField.tsx
+++ b/website/src/components/SearchPage/fields/AutoCompleteField.tsx
@@ -105,6 +105,7 @@ export const AutoCompleteField = ({
                             setQuery('');
                             setAFieldValue(field.name, '');
                         }}
+                        aria-label='Clear'
                     >
                         <svg className='w-5 h-5 text-gray-400' fill='currentColor' viewBox='0 0 20 20'>
                             <path