testing: add `StandardGauge` stories

src/components/StandardGauge.stories.tsx

@@ -0,0 +1,37 @@
+import type { Meta, StoryObj } from '@storybook/react'
+
+import StandardGauge from './StandardGauge'
+
+const meta = {
+  title: 'General/StandardGauge',
+  component: StandardGauge,
+  parameters: {
+    layout: 'centered',
+  },
+  tags: ['autodocs'],
+  decorators: [
+    Story => (
+      <div style={{ height: '25vh' }}>
+        <Story />
+      </div>
+    ),
+  ],
+} satisfies Meta<typeof StandardGauge>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const WithDataPoints: Story = {
+  args: {
+    data: [
+      { id: '1', color: 'red', label: 'Red', value: 42 },
+      { id: '2', color: 'blue', label: 'Blue', value: 1337 },
+    ],
+  },
+}
+
+export const WithoutDataPoints: Story = {
+  args: {
+    data: [],
+  },
+}

src/components/StandardGauge.tsx

@@ -1,13 +1,14 @@
 import { ResponsivePie } from '@nivo/pie'
 
-interface Data {
+export interface GaugeDataPoint {
   id: string
   label: string
   value: number
   color: string
 }
+
 interface StandardGaugeProps {
-  data: Data[]
+  data: GaugeDataPoint[]
 }
 
 const StandardGauge = ({ data }: StandardGaugeProps) => (