Java:不同参数排序的测试方法 [英] Java: test methods of different parameter orderings

问题描述

无论参数顺序如何，我都想正确验证方法.

I want to correctly validate a method regardless of the parameter ordering.

因此，代码段 1 和 2 都应该通过代码段 3 中的测试用例.

Therefore, snippet 1 and 2 should both pass the test case in snippet 3.

(片段 1)

public Integer compute_speed(Integer distance, Integer time) {  
    return distance/time;
}

(片段 2)

public Integer compute_speed(Integer time, Integer distance) {  
    return distance/time;
}

您可以假设这两个片段是两个学生提交的不同代码.并且您可以假设参数的数量可以多达 10 个.

在测试用例中，我写道，

In the test case, I wrote,

(片段 3)

 return compute_speed(3, 1).equals(3);

这验证了代码段 1，但失败了 2.我怎样才能使两个代码段都通过测试用例?

This validates snippet 1 but fails for 2. How can I make it such that both snippets pass the test case?

如果有类似的东西，

return compute_speed(distance = 3, time = 1).equals(3);

提前致谢...

推荐答案

更简洁的方法是使用 Integer computeSpeed(Integer time, Integer distance); 方法创建接口:

A cleaner way would be to create an interface with a Integer computeSpeed(Integer time, Integer distance); method:

public interface DistanceCalculator {
    Integer computeSpeed(Integer distance, Integer time);
}

然后您要求学生实现它并调用他们的实现 StudentNameDistanceCalculator.例如，您将收到学生的以下课程:

You then ask the students to implement it and call their implementation StudentNameDistanceCalculator. For example you will receive the following classes from your students:

public class AssyliasDistanceCalculator implements DistanceCalculator {
    public Integer computeSpeed(Integer distance, Integer time) {  
        return distance / time;
    }
}

public class BobDistanceCalculator implements DistanceCalculator {
    public Integer computeSpeed(Integer distance, Integer time) {
        return distance / time * 2;
    }
}

然后您可以在一个项目中加载他们的所有类并一次测试所有类.以 TestNg 为例:

You can then load all their classes in one project and test all the classes at once. For example with TestNg:

@Test(dataProvider = "students")
public void testMethod(Class<?> clazz) throws Exception {
    DistanceCalculator dc = (DistanceCalculator) clazz.newInstance();
    assertEquals(dc.computeSpeed(3, 1), (Integer) 3, 
            clazz.getSimpleName().replace("DistanceCalculator", "") + " failed");
}

@DataProvider(name = "students")
public Object[][] dataProvider() {
    return new Object[][]{
        {AssyliasDistanceCalculator.class},
        {BobDistanceCalculator.class}};
}

你会得到一份关于谁没有通过测试的详细报告:

And you will get a detailed report of who doesn't pass the test:

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