rspec和期望更改的問題

Question

我正在使用rspec來測試Ruby終端應用程序。我似乎無法想出測試散列中的變化

我仍然試圖將我的頭包裹在一般測試中，所以很可能我誤解了有關測試的多個事情。

我試圖測試，當收費被添加到帳戶的實例但收費超過帳戶限制。賬戶餘額不變。

class Account 
    def apply_charge(card_holder_name, charge) 
    charge  = int_dollar_input(charge) 
    account  = find_account_by_card_holder(card_holder_name) 
    temp_balance = account[:balance] + charge 

    account[:balance] = account[:balance] + charge if temp_balance < account[:limit] 
    end 
end 

describe "Adding a charge to an account" do 
    context "GIVEN a charge amount that exceeds the account limit" do 

    let(:account)  { subject.add_account("William", 5454545454545454,'$1000') } 

    it "will do nothing" do 
     expect(subject.apply_charge('William', '$1200')). 
     to_not change {account[:balance]} 
    end 
    end 
end 

帳戶是散列（S）

account.inspect = [{:card_holder_name=>"William", :card_number=>5454545454545454, :limit=>1000, :balance=>0}] 

1) Account Adding a charge to an account GIVEN a charge amount that exceeds the account limit will do nothing Failure/Error: expect(subject.apply_charge('William', '$1200')). to_not change {account[:balance]}

expected `account[:balance]` not to have changed, but was not given a block 
# ./spec/account_spec.rb:46:in `block (4 levels) in <top (required)>' 

Answer 1

預計需要是在一個塊的數組：expect { subject.apply_charge('William', '$1200') }.to.....