feat: add first failing test

__tests__/aggregate.spec.js

-describe('Filter function', () => {
-  // test stuff
-  it('should fail', () => {
-    expect(true).toBe(false)
+const { buildAgregatedData } = require('../src/aggregate')
+describe('buildAgregatedData', () => {
+  it('should return empty', async () => {
+    const reply = await buildAgregatedData([], 'com.enedis.day')
+    expect(reply).toEqual([])
   })
 })