Rspec aggregate_failures syntax

意思就是在 aggregate_failures block 底下任一個的 expectation 有 error 時會針對每個 expectation 顯示 error 的 message

example

```ruby
    it "returns false if any of balance, locked, saving is negative" do
      negative_balance_account = build(:account, balance: -1)
      negative_locked_account = build(:account, locked: -1)
      negative_saving_account = build(:account, saving: -1)

      aggregate_failures "testing all senarios" do
        expect(negative_balance_account.has_negative_asset?).to be true
        expect(negative_locked_account.has_negative_asset?).to be true
        expect(negative_saving_account.has_negative_asset?).to be true
      end
    end
```

假設這個 test failed 了，那 console 的訊息會是像這樣：

```
  1) Account#has_negative_asset? returns false if any of balance, locked, saving is negative
     Got 2 failures from failure aggregation block "testing all senarios".
     # ./spec/models/account_spec.rb:15:in `block (3 levels) in <top (required)>'

     1.1) Failure/Error: expect(negative_locked_account.has_negative_asset?).to be true

            expected true
                 got false
          # ./spec/models/account_spec.rb:17:in `block (4 levels) in <top (required)>'

     1.2) Failure/Error: expect(negative_saving_account.has_negative_asset?).to be true

            expected true
                 got false
          # ./spec/models/account_spec.rb:18:in `block (4 levels) in <top (required)>'
```

會顯示哪幾個 test failed 了

當有很多 test case 很相近其實可以寫在一個senario 裡時用 aggregate_failures 會讓 test 變得更簡潔，但要小心不要亂用，該分開的 test 還是用 it 分開比較好。


https://relishapp.com/rspec/rspec-core/docs/expectation-framework-integration/aggregating-failures