diff --git a/apps/web/src/app/(portal)/modules/tender-radar/settings/components/SourceConfigForm.test.tsx b/apps/web/src/app/(portal)/modules/tender-radar/settings/components/SourceConfigForm.test.tsx
new file mode 100644
index 0000000..0849d05
--- /dev/null
+++ b/apps/web/src/app/(portal)/modules/tender-radar/settings/components/SourceConfigForm.test.tsx
@@ -0,0 +1,136 @@
+import { cleanup, render, screen, waitFor, fireEvent } from '@testing-library/react';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+// Mock @/lib/tender-radar-api
+const mockFetchSourceConfig = vi.fn();
+const mockSaveSourceConfig = vi.fn();
+
+vi.mock('@/lib/tender-radar-api', () => ({
+  fetchSourceConfig: (...args: unknown[]) => mockFetchSourceConfig(...args),
+  saveSourceConfig: (...args: unknown[]) => mockSaveSourceConfig(...args),
+}));
+
+afterEach(() => {
+  cleanup();
+  // Reset call history AND implementations between tests — restoreAllMocks
+  // alone does not clear vi.fn() call counts for these module-level mocks,
+  // which would otherwise leak a prior test's saveSourceConfig call into a
+  // later "not.toHaveBeenCalled()" assertion.
+  mockFetchSourceConfig.mockReset();
+  mockSaveSourceConfig.mockReset();
+  vi.restoreAllMocks();
+});
+
+describe('SourceConfigForm', () => {
+  it('fetches config on mount and renders the returned pollIntervalMin in the interval input', async () => {
+    mockFetchSourceConfig.mockResolvedValue({
+      sourceType: 'doe-opendata',
+      pollIntervalMin: 90,
+      isActive: true,
+      lastIngestedDay: null,
+    });
+
+    const { SourceConfigForm } = await import('./SourceConfigForm');
+    render(<SourceConfigForm />);
+
+    await waitFor(() => {
+      expect(
+        screen.getByLabelText(/Abrufintervall/i) as HTMLInputElement,
+      ).toHaveValue(90);
+    });
+
+    expect(mockFetchSourceConfig).toHaveBeenCalledTimes(1);
+  });
+
+  it('editing the interval and clicking Speichern calls saveSourceConfig with the new pollIntervalMin and isActive', async () => {
+    mockFetchSourceConfig.mockResolvedValue({
+      sourceType: 'doe-opendata',
+      pollIntervalMin: 60,
+      isActive: false,
+      lastIngestedDay: '2026-07-20T00:00:00.000Z',
+    });
+    mockSaveSourceConfig.mockResolvedValue({
+      sourceType: 'doe-opendata',
+      pollIntervalMin: 120,
+      isActive: true,
+      lastIngestedDay: '2026-07-20T00:00:00.000Z',
+    });
+
+    const { SourceConfigForm } = await import('./SourceConfigForm');
+    render(<SourceConfigForm />);
+
+    await waitFor(() => {
+      expect(screen.getByLabelText(/Abrufintervall/i)).toHaveValue(60);
+    });
+
+    fireEvent.change(screen.getByLabelText(/Abrufintervall/i), {
+      target: { value: '120' },
+    });
+    fireEvent.click(screen.getByRole('switch'));
+
+    fireEvent.click(screen.getByRole('button', { name: 'Speichern' }));
+
+    await waitFor(() => {
+      expect(mockSaveSourceConfig).toHaveBeenCalledWith({
+        pollIntervalMin: 120,
+        isActive: true,
+      });
+    });
+  });
+
+  it('rejects an interval below 5 client-side without calling saveSourceConfig', async () => {
+    mockFetchSourceConfig.mockResolvedValue({
+      sourceType: 'doe-opendata',
+      pollIntervalMin: 60,
+      isActive: true,
+      lastIngestedDay: null,
+    });
+
+    const { SourceConfigForm } = await import('./SourceConfigForm');
+    render(<SourceConfigForm />);
+
+    await waitFor(() => {
+      expect(screen.getByLabelText(/Abrufintervall/i)).toHaveValue(60);
+    });
+
+    fireEvent.change(screen.getByLabelText(/Abrufintervall/i), {
+      target: { value: '2' },
+    });
+    fireEvent.click(screen.getByRole('button', { name: 'Speichern' }));
+
+    await waitFor(() => {
+      expect(
+        screen.getByText(/Intervall muss zwischen 5 und 1440 Minuten liegen/i),
+      ).toBeInTheDocument();
+    });
+    expect(mockSaveSourceConfig).not.toHaveBeenCalled();
+  });
+
+  it('rejects an interval above 1440 client-side without calling saveSourceConfig', async () => {
+    mockFetchSourceConfig.mockResolvedValue({
+      sourceType: 'doe-opendata',
+      pollIntervalMin: 60,
+      isActive: true,
+      lastIngestedDay: null,
+    });
+
+    const { SourceConfigForm } = await import('./SourceConfigForm');
+    render(<SourceConfigForm />);
+
+    await waitFor(() => {
+      expect(screen.getByLabelText(/Abrufintervall/i)).toHaveValue(60);
+    });
+
+    fireEvent.change(screen.getByLabelText(/Abrufintervall/i), {
+      target: { value: '1441' },
+    });
+    fireEvent.click(screen.getByRole('button', { name: 'Speichern' }));
+
+    await waitFor(() => {
+      expect(
+        screen.getByText(/Intervall muss zwischen 5 und 1440 Minuten liegen/i),
+      ).toBeInTheDocument();
+    });
+    expect(mockSaveSourceConfig).not.toHaveBeenCalled();
+  });
+});