replaced a matcher

exercises/07_unit_testing/database/unit tests/todo.spec.js

@@ -45,11 +45,10 @@ describe('add()', () => {
 		// ACT
 		await todo.add('bread', 4)
 		await todo.add('bread', 2)
-		const count = await todo.countItems()
 		const data = await todo.getAll()
 		const qty = data[0].qty
-		// ASSERT (note there are two assertions as stated on line 50)
-		expect(count).toBe(1)
+		// ASSERT (note there are two assertions as stated on line 42)
+		expect(data).toHaveLength(1)
 		expect(qty).toEqual(6)
 		done()
 	})