fix(workbench): show single expense distribution chart

web/tests/donut-chart.test.mjs

@@ -0,0 +1,15 @@
+import assert from 'node:assert/strict'
+import { readFileSync } from 'node:fs'
+import test from 'node:test'
+import { fileURLToPath } from 'node:url'
+
+const donutChart = readFileSync(
+  fileURLToPath(new URL('../src/components/charts/DonutChart.vue', import.meta.url)),
+  'utf8'
+)
+
+test('donut chart supports hiding its built-in legend without changing the default', () => {
+  assert.match(donutChart, /showLegend: \{ type: Boolean, default: true \}/)
+  assert.match(donutChart, /v-if="showLegend" class="donut-legend"/)
+  assert.match(donutChart, /donut-chart--legendless/)
+})