RSpec:使用“接收..完全..跟..and_return..“，带有不同的”with“参数

Question

我正在编写一个期望，该期望检查是否使用不同的参数调用了两次方法并返回了不同的值。目前我只是写了两次期望：

expect(ctx[:helpers]).to receive(:sanitize_strip).with(
  %{Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>},
  length: nil
).and_return('String description and newline')
expect(ctx[:helpers]).to receive(:sanitize_strip).with(
  %{Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>},
  length: 15
).and_return('String descr...')

我

想知道我是否可以改用receive ... exactly ... with ... and_return ...;像这样：

expect(ctx[:helpers]).to receive(:sanitize_strip).exactly(2).times.with(
  %{Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>},
  length: nil
).with(
  %{Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>},
  length: 15
).and_return('String descr...', 'String description and newline')

上面的代码不起作用，它引发了以下错误：

1) Types::Collection fields succeeds
   Failure/Error: context[:helpers].sanitize_strip(text, length: truncate_at)
     #<Double :helpers> received :sanitize_strip with unexpected arguments
       expected: ("Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>", {:length=>15})
            got: ("Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>", {:length=>nil})
     Diff:
     @@ -1,3 +1,3 @@
      ["Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>",
     - {:length=>15}]
     + {:length=>nil}]

有没有办法使用具有不同with参数的receive ... exactly ... with ... and_return ...？

Answer 1

有一个

rspec-any_of gem 允许通过all_of参数匹配器来使用以下语法：

expect(ctx[:helpers]).to receive(:sanitize_strip).with(
  %{Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>}
  all_of({length: 15}, {length: nil})
)
.and_return('String descr...', 'String description and newline')
.twice

Answer 2

如果不使用额外的 gem，您可以使用each块内的变量调用普通expect ... to receive ... with ... and_return ...：

describe '#sanitize_strip' do
  let(:html) do
    %{Stringn<a href="http://localhost:3000/">description</a> <br/>and newlinen<br>}
  end
  let(:test_data) do
    [
      [[html, length: nil], 'String description and newline'],
      [[html, length: 15], 'String descr...']
    ]
  end
  it 'returns sanitized strings stripped to the number of characters provided' do
    test_data.each do |args, result|
      expect(ctx[:helpers]).to receive(:sanitize_strip).with(*args).and_return(result)
    end
    # Trigger the calls to sanitize_strip
  end
end