对每个循环使用 Rspec 的单元测试用例

问题描述

我的模型中有以下方法

def get_performance_data para, child_para_hash
  performance_graph_data = {}
  child_para_hash.each do |cp|
    performance_graph_data[cp] =  fetch_per_child_para_data(para, cp)
  end
  performance_graph_data
end


def fetch_per_child_para_data para, child_para
  test_performances.where(network_data_condition(para, child_para)).select("AVG(value)avg_value, activity").group('act_num')
end

我在理解如何为模型方法中的每个循环编写测试用例时遇到问题.

I am having problems in understanding how to write test cases for each loop in model methods.

推荐答案

好的测试是关于验证方法的行为，而不是其内部工作.因此，根据发布的示例，您的测试应该检查 #get_performance_data 是否返回了由您的装置定义的 performance_graph_data 的正确值，而不是检查内部循环实现.

Good tests are about validating the behavior of a method, not its internal workings. So, based on the posted example, your tests should be checking that #get_performance_data returns the correct value for performance_graph_data as defined by your fixtures, not checking the internal loop implementation.

如果您的测试在概念上不是说给定输入 X，我的结果应该始终是 Y"，那么您可能正在测试错误的东西.与往常一样，这条规则也有例外，但如果没有很好的理由，我不会违反规则.

If your test isn't conceptually saying "Given input X, my result should always be Y" then you're probably testing the wrong thing. As always, there are exceptions to this rule, but I wouldn't break the rule without a very good reason.

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