使用RSpec

Question

測試PG數據庫約束我想使用RSpec的一個軌道4測試PG數據庫的限制，我不知道如何設置它。

我的想法是做這樣的事情：

before do 
    @subscriber = Marketing::Subscriber.new(email: "subscriber@example.com") 
end 

describe "when email address is already taken" do 
    before do 
    subscriber_with_same_email = @subscriber.dup 
    subscriber_with_same_email.email = @subscriber.email.upcase 
    subscriber_with_same_email.save 
    end 

    it "should raise db error when validation is skipped" do 
    expect(@subscriber.save!(validate: false)).to raise_error 
    end 
end 

當我運行它，它在產生一個錯誤：

PG::UniqueViolation: ERROR: duplicate key value violates unique constraint 

然而，測試仍然失敗。

是否有正確的語法來獲得測試通過？

Answer 1

嘗試

it "should raise db error when validation is skipped" do 
    expect { @subscriber.save!(validate: false) }.to raise_error 
end 

欲瞭解更多信息，請查看more info on rspec-expectations expect-error matchers

希望這有助於！