assertNotNull  
  Asserts that the actual value is not null, with an optional message.
Since Kotlin
1.1Asserts that the actual value is not null, with an optional message and a function block to process the not-null value.
Since Kotlin
1.1Asserts that the actual value is not null, with an optional message.
Since Kotlin
1.0Asserts that the actual value is not null, with an optional message and a function block to process the not-null value.