Matchers.any()在Mockito中为空值 [英] Matchers.any() for null value in Mockito

问题描述

假设我有这个对象objectDemo，它使用2个参数String和null调用方法objectDemoMethod.现在，我想验证此方法是否已通过Mockito调用:

Suppose I am having this object objectDemo which calls to the method objectDemoMethod with 2 parameters String and null. Now I want to verify that this method was called with Mockito:

objectDemo.objectDemoMethod("SAMPLE_STRING", null);

我写了这个:

Mockito.verify(objectDemo, Mockito.times(1)).objectDemoMethod(Matchers.any(String.class), null);

但是出现错误:

无效使用参数匹配器来获取空值.

Invalid use of argument matchers for null value.

还有其他方法可以传递空值吗?

Is there any another way to pass null value?

推荐答案

由于您仅对一个参数使用参数匹配器，而对另一个参数不使用参数匹配器，因此会出现错误消息.来自 Matchers Javadoc:

The error message you are getting is expected since you are using argument matcher for only one argument and not the other. From Matchers Javadoc:

如果您使用的是参数匹配器，则所有参数必须由匹配器提供.

If you are using argument matchers, all arguments have to be provided by matchers.

因此，解决方法是也将匹配器用于方法的第二个参数.在这种情况下，它将是匹配null的匹配器.根据Mockito和Java的版本，您可以:

Therefore, the fix is to use a matcher for the second parameter of the method as well. In this case, it would be a matcher matching null. Depending on the version of Mockito and Java, you can have:

• 从Mockito 2开始，您可以使用

• Starting with Mockito 2, you can use ArgumentMatchers.isNull(). This works with Java 8 and above:

verify(objectDemo, times(1)).objectDemoMethod(any(String.class), isNull());

请注意，如果您使用的是Java 7或更早版本，则需要显式强制转换才能完成此工作，因为这些Java版本中的类型推断未考虑称为以下方法的类型:

Note that if you're running with Java 7 or older, you'll need an explicit cast to make this work, because the type inference in those versions of Java does not take into account the types of the method called:

verify(objectDemo, times(1)).objectDemoMethod(any(String.class), (String) isNull());

如果使用的是Mockito 1，则可以使用

If you're using Mockito 1, you can use the Matchers.isNull(clazz) instead:

verify(objectDemo, times(1)).objectDemoMethod(any(String.class), isNull(String.class));

对于Java≤在7种情况下，或在Mockito 1情况下，这些示例使用的情况是第二个参数的类型为String:需要将其替换为方法参数的实际类型.

For the Java ≤ 7 or Mockito 1 cases, the examples uses a case where the second parameter was of type String: it would need to be replaced with the actual type of the method parameter.

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