CODEWITHSUNDEEP
scalamockitoscalatest
Mozhi
Mozhi

Reputation: 827

How to assert verify the access of case class fields in scala?

I wanted to know and assert whether case class has been accessed or not ? For instance in java value objects i can assert on getters to verify whether the instance variables of value objects were accessed or not . In scala i want to achieve similar thing while accessing case class fields. 

case class Student(id:Int,name:String,department:String)

public def insertDataIntoTable(sc: Student = Student(1,"pspk","ap")) : Unit ={

  val id =  transform(sc.id)
  val name = transform(sc.name)
val dept = transform(sc.department)

}

In the above code snippet i would like to add unit-test to verify id , name , department fields were accessed 1 time every time insertDataIntoTable is executed.

With the help of mockito how can i achieve that in unit-tests ?

Any inputs are much appreciated. Thank you

Upvotes: 0

Views: 1146

Answers (1)

Mario Galic
Mario Galic

Reputation: 48420

Consider using Mockito.spy in combination with Mockito.verifyZeroInteractions like so:

class HelloSpec extends FlatSpec with Matchers {
  case class Student(id: Int, name: String, department: String)

  "Student case class" should "not have interactions" in {
    val student = Mockito.spy(Student(1, "Mario", "Starfleet Academy"))
    student.department // access case class field
    Mockito.verifyZeroInteractions(student)
  }
}

This should fail with:

No interactions wanted here:
-> at example.HelloSpec.$anonfun$new$1(HelloSpec.scala:12)
But found this interaction on mock 'student':
-> at example.HelloSpec.$anonfun$new$1(HelloSpec.scala:11)

spy enables inspecting interactions with real objects such as case classes, whilst verifyZeroInteractions does what it says on the tin.

Upvotes: 2

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