Add tests

Author: bernardobelchior

packages/x-charts/src/BarChart/BarChart.test.tsx

@@ -43,6 +43,37 @@ describe('<BarChart />', () => {
     expect(screen.getByText('No data to display')).toBeVisible();
   });
 
+  it('prioritizes `barLabel` from series over `barLabel` prop', () => {
+    render(
+      <BarChart
+        barLabel={() => 'Bar label from prop'}
+        series={[{ data: [1], barLabel: () => 'Bar label from series' }]}
+        width={100}
+        height={100}
+        xAxis={[{ data: ['A'] }]}
+        yAxis={[]}
+      />,
+    );
+
+    expect(screen.getByText('Bar label from series')).toBeVisible();
+  });
+
+  it("defaults to `barLabel` prop when `barLabel` from series isn't defined", () => {
+    render(
+      <BarChart
+        barLabel={() => 'Bar label from prop'}
+        series={[{ data: [1] }, { data: [1], barLabel: () => 'Bar label from 2nd series' }]}
+        width={100}
+        height={100}
+        xAxis={[{ data: ['A'] }]}
+        yAxis={[]}
+      />,
+    );
+
+    expect(screen.getByText('Bar label from prop')).toBeVisible();
+    expect(screen.getByText('Bar label from 2nd series')).toBeVisible();
+  });
+
   const wrapper = ({ children }: { children?: React.ReactNode }) => (
     <div style={{ width: 400, height: 400 }}>{children}</div>
   );