diff --git a/frontend/src/lib/planner/VarietyScoreHero.test.ts b/frontend/src/lib/planner/VarietyScoreHero.test.ts
index 16a69ae..a781f65 100644
--- a/frontend/src/lib/planner/VarietyScoreHero.test.ts
+++ b/frontend/src/lib/planner/VarietyScoreHero.test.ts
@@ -40,4 +40,35 @@ describe('VarietyScoreHero', () => {
 		render(VarietyScoreHero, { props: { score: 2.1 } });
 		expect(screen.getByTestId('score-description').textContent).toContain('Unzureichend');
 	});
+
+	it('shows "Unzureichend" for score = 0 (boundary)', () => {
+		render(VarietyScoreHero, { props: { score: 0 } });
+		expect(screen.getByTestId('score-description').textContent).toContain('Unzureichend');
+	});
+
+	it('renders score 0 in score-value for score = 0', () => {
+		render(VarietyScoreHero, { props: { score: 0 } });
+		expect(screen.getByTestId('score-value').textContent).toContain('0');
+	});
+
+	it('renders 0-width progress bar for score = 0', () => {
+		render(VarietyScoreHero, { props: { score: 0 } });
+		const bar = screen.getByRole('progressbar');
+		expect(bar.getAttribute('aria-valuenow')).toBe('0');
+	});
+
+	it('shows "Ausgezeichnet" for score = 10 (boundary)', () => {
+		render(VarietyScoreHero, { props: { score: 10 } });
+		expect(screen.getByTestId('score-description').textContent).toContain('Ausgezeichnet');
+	});
+
+	it('shows "Verbesserbar" for score = 4 (boundary)', () => {
+		render(VarietyScoreHero, { props: { score: 4 } });
+		expect(screen.getByTestId('score-description').textContent).toContain('Verbesserbar');
+	});
+
+	it('shows "Gut" for score = 7 (boundary)', () => {
+		render(VarietyScoreHero, { props: { score: 7 } });
+		expect(screen.getByTestId('score-description').textContent).toContain('Gut');
+	});
 });