我怎么能期望用特定的块调用特定的方法？

Question

我希望能够使用 rspec 测试特定的 gem 调用了特定的块：

代码如下所示

SomeGem.configure do |config|
  config.username = "hello"
  config.password = "world"
end

我编写的规范如下所示：

it 'sets valid gem configuration' do
  credentials = lambda do |config|
    config.username = "hello"
    config.password = "world"
  end

  expect(SomeGem).to receive(:configure).with(credentials)
end

我遇到的错误：

Failure/Error: expect(SomeGem).to receive(:configure).with(credentials)
Wrong number of arguments. Expected 0, got 1.

关于我应该如何测试它有什么想法吗？

Answer 1

我宁愿尝试断言外部可见的效果。假设你有一个 SomeGem.configuration 方法可以用来检索配置的值，那么你可以写

describe 'configuration block' do
  subject do
    lambda do
      SomeGem.configure do |config|
        config.username = "hello"
        config.password = "world"
      end
    end
  end

  it { is_expected.to change(SomeGem.configuration, :username).to("hello") }
  it { is_expected.to change(SomeGem.configuration, :password).to("world") }
end

我怎么能期望用特定的块调用特定的方法？

How can I expect that a certain method is called with a specific block?

ruby

rspec

ruby-on-rails

mocking