适当使用断言 [英] Appropriate use of assert

问题描述

您能否帮助我更好地理解，断言"与引发异常"的适当用法是什么?每种情况何时合适?

Can you please help me better understand, what is an appropriate use of "assert" vs "throwing an exception? When is each scenario appropriate?

场景1

CODE

public Context(Algorythm algo) {
  if (algo == null) {
      throw new IllegalArgumentException("Failed to initialize Context");
  }
  this.algo = algo;
}

测试

public void testContext_null() {
  try {
      context = new Context(null);
      fail();
  } catch (IllegalArgumentException e) {
      assertNotNull(e);
  }
}

场景2

CODE

public Context(Algorythm algo) {
  assert (algo != null);
  this.algo = algo;
}

测试

public void testContext_null() {
  try {
      context = new Context(null);
      fail();
  } catch (AssertionFailedError e) {
      assertNotNull(e);
  }
}

推荐答案

与assert的主要区别是；

The main difference with assert is;

• 按类/软件包打开/关闭所选测试的功能.
• 引发的错误.

断言更适合于将在生产中关闭的测试.

assert is more approriate for tests which will be turned off in production.

如果您希望每次都进行一次检查，特别是如果要验证输入中的数据，则应该使用每次都运行的检查.

If you want a test which is checked every time, esp if validating data from an input, you should use the check which runs every time.

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