如何将测试覆盖率添加到私有构造函数？ [英] How to add test coverage to a private constructor?

问题描述

这是代码：

package com.XXX;
public final class Foo {
  private Foo() {
    // intentionally empty
  }
  public static int bar() {
    return 1;
  }
}

这是测试：

package com.XXX;
public FooTest {
  @Test 
  void testValidatesThatBarWorks() {
    int result = Foo.bar();
    assertEquals(1, result);
  }
  @Test(expected = java.lang.IllegalAccessException.class)
  void testValidatesThatClassFooIsNotInstantiable() {
    Class cls = Class.forName("com.XXX.Foo");
    cls.newInstance(); // exception here
  }
}

工作正常，课程经过测试。但Cobertura表示，该类私有构造函数的代码覆盖率为零。我们如何为这样的私有构造函数添加测试覆盖率？

Works fine, the class is tested. But Cobertura says that there is zero code coverage of the private constructor of the class. How can we add test coverage to such a private constructor?

推荐答案

嗯，有些方法可以使用反射等 - 但是是不是真的值得吗？这是一个永远不会被称为的构造函数，对吗？

Well, there are ways you could potentially use reflection etc - but is it really worth it? This is a constructor which should never be called, right?

如果有一个注释或类似的东西，你可以添加到类来制作Cobertura明白它不会被调用，这样做：我认为值得通过箍来人为地增加覆盖率。

If there's an annotation or anything similar that you can add to the class to make Cobertura understand that it won't be called, do that: I don't think it's worth going through hoops to add coverage artificially.

编辑：如果没办法这样做，只是略微减少了覆盖范围。请记住，覆盖范围应该是对你有用的东西 - 你应该负责该工具，而不是相反。

If there's no way of doing it, just live with the slightly reduced coverage. Remember that coverage is meant to be something which is useful to you - you should be in charge of the tool, not the other way round.

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