JUnit5:测试多个类而无需重复代码 [英] JUnit5: Test multiple classes without repeating code

问题描述

我已经用Java构建了自己的堆栈实现，如下所示:

I have built my own implementation of a stack in Java, which looks something like this:

有一个堆栈"接口，提供基本功能(弹出，推入，偷看等).然后，我有2个具体的类，一个是借助数组的类，另一个是具有链表的类(在这种情况下，这并不重要).

There is the interface "Stack" which provides the basic functions (pop, push, peek etc.). And then I have 2 concrete classes, one with the help of arrays and the one with a linked list (how is not important in this case).

现在我的问题是:我想用JUnit5进行测试，因为您无法实例化接口，所以我必须对数组的类和链接列表的类分别测试每个功能，因此代码太长了.有没有一种方法可以测试该接口的所有功能或类似功能?因为如果现在添加了第三个实现，那么我将不得不再次重写所有实现.

Now my question: I want to test this with JUnit5 and because you can't instantiate an interface, I have to test each function once for the class with the arrays and once for the class with the linked list, so the code is unnecessarily long. Is there a way that I can test all functions for the interface or something similar? Because if now a third implementation was added, I'd have to rewrite it all again.

我已经尝试过'ParameterizedTests'，但是没有取得任何进展.

I have already tried 'ParameterizedTests', but I have not made any progress.

我很乐意提供帮助！

推荐答案

我不知道您遇到的@ParameterizedTest问题是什么，但是如您所要求的，这是一个非常通用的测试示例，可能对您的测试有用:

I do not know what problem with @ParameterizedTest you are facing, but as you requested this is a very generic test example which could be useful for your test:

import static org.junit.jupiter.api.Assertions.assertEquals;  
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
...

public static Stream<Arguments> provideStacks() {
  return Stream.of(
      Arguments.of(new ArrayStack()),
      Arguments.of(new LinkedStack())
  );
}

@ParameterizedTest
@MethodSource("provideStacks")
public void test(Stack stack) {
  stack.push(1);
  assertEquals(1, stack.pop());
}

public interface Stack {
  void push(int i);
  int pop();
}

public static final class ArrayStack implements Stack {
  @Override
  public void push(int i) {
  }

  @Override
  public int pop() {
    return 1;
  }
}

public static final class LinkedStack implements Stack {
  @Override
  public void push(int i) {
  }

  @Override
  public int pop() {
    return 1;
  }
}

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