四捨五入問題RSpec的測試，比較浮陣列時

Question

有這結果，我想檢查的方法：

result.should == [1.0,2.0,3.0] 

但我得到一個錯誤：

expected: [1.0, 2.0, 3.0] 
     got: [1.0, 2.0, 3.0] (using ==) 

我認爲問題在於舍入，但我不知道如何比較它們，例如0.1的偏差。

謝謝，apneadiving。 我寫自己的匹配，如果幫助別人：

RSpec::Matchers.define :be_closed_array do |expected, truth| 
    match do |actual| 
    same = 0 
    for i in 0..actual.length-1 
     same +=1 if actual[i].round(truth) == expected[i].round(truth) 
    end 
    same == actual.length 
    end 

    failure_message_for_should do |actual| 
    "expected that #{actual} would be close to #{expected}" 
    end 

    failure_message_for_should_not do |actual| 
    "expected that #{actual} would not be close to #{expected}" 
    end 

    description do 
    "be a close to #{expected}" 
    end 
end 

Answer 1

用途：

.should be_close 

甚至：

.should be_within 

參考這裏http://rubydoc.info/gems/rspec-expectations/2.4.0/RSpec/Matchers