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via Google Groups by Taylor Smith, 1 year ago
wrongly written multi-threaded tests. Please refer to Mockito FAQ on limitations of concurrency testing. 2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub spies - [info] - with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.
org.mockito.exceptions.misusing.WrongTypeOfReturnValue: ValueString 
cannot be returned by calcValue()
 calcValue() should return String
 ***
 If you're unsure why you're getting above error read on.
 Due to the nature of the syntax above problem might occur because:
 1. This exception *might* occur in wrongly written multi-threaded 
tests.
 Please refer to Mockito FAQ on limitations of concurrency testing.
 2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer 
to stub spies -
[info] - with doReturn|Throw() family of methods. More in javadocs for 
Mockito.spy() method.	at com.example.ValueClassSpec$anonfun$1.apply$mcV$sp(testthing.scala:32)	at com.example.ValueClassSpec$anonfun$1.apply(testthing.scala:28)	at com.example.ValueClassSpec$anonfun$1.apply(testthing.scala:28)	at org.scalatest.Transformer$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)	at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)	at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)	at org.scalatest.Transformer.apply(Transformer.scala:22)	at org.scalatest.Transformer.apply(Transformer.scala:20)	at org.scalatest.FlatSpecLike$anon$1.apply(FlatSpecLike.scala:1647)	at org.scalatest.Suite$class.withFixture(Suite.scala:1122)