fix(energy): fix best array order (#691)

Author: sphaugh

src/conversions/measures/energy.ts

@@ -4,7 +4,7 @@ import { type Measure, MeasureKind } from '../types';
 
 export const energy: Measure = {
 	kind: MeasureKind.Energy,
-	best: ['GWh', 'MWh', 'kWh', 'Wh', 'J'],
+	best: ['J', 'Wh', 'kWh', 'MWh', 'GWh'],
 	units: [
 		{ names: ['joule', 'joules'], symbols: ['J'], ratio: 1 },
 		...expandMacro(Macros.si, {

src/converters/conversions/energy.test.ts

@@ -1,7 +1,15 @@
-import { describe } from 'vitest';
+import { describe, expect } from 'vitest';
 import { assertConversions } from '../../../test/assert-conversion';
+import { convert } from '../convert';
 
 describe('conversions', () => {
 	assertConversions([{ from: [1, 'kWh'], to: [60 * 60 * 1000, 'joules'] }]);
 	assertConversions([{ from: [1000, 'J'], to: [1, 'kilojoule'] }]);
+	assertConversions([{ from: [1000000, 'kWh'], to: [1, 'GWh'] }]);
+
+	const best1GWh = convert(1000000, 'kWh').to('best').toString();
+	const best1Wh = convert(3600, 'J').to('best').toString();
+
+	expect(best1GWh).toBe('1 GWh');
+	expect(best1Wh).toBe('1 Wh');
 });