当我为mock参数传递任何字符串时，InvalidUseOfMatchersException

Question

我希望我的模拟能够处理方法的任何输入

val redis = mock[RedisClient]
when(redis.scard(any[String])).thenReturn(Some("hello"))

错误：

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Invalid use of argument matchers!
[info] 2 matchers expected, 1 recorded:
[info] -> at ..(SomeSpec.scala:123)
[info] 
[info] This exception may occur if matchers are combined with raw values:
[info]     //incorrect:
[info]     someMethod(anyObject(), "raw String");

Answer 1

scard有两个参数，其中one parameter为implicit：

// SCARD
// Return the number of elements (the cardinality) of the Set at key.
def scard(key: Any)(implicit format: Format): Option[Long] =
  send("SCARD", List(key))(asLong)

如果你没有指定参数，Scala会提供一个参数，这会干扰Mockito line up matchers with arguments的能力。

另请参阅：org.specs2.mock.Mockito matchers are not working as expected